Beam Polarization: Raw Results 2000

Results 2000

08 April 2000 00:30-05:30.

The beam energy is 3.407 GeV (MCC) or ?? (EP), one linac is 0.420 GeV (N=0.4185 S=0.4185, inj=0.04708). The injector angle is 28.0^o, the 1/2 wave plate was OUT.

The laser phase was at 4.9^o. The slit was 23., attenuator at 140.

Mott: 73+/-0.5+/-2% (see ELOG)

Supermendur target P=7.6%. Target Angles and Beam Polarizations. The theta acceptance is about +/-15^o? and the mean analysing power is 0.76. The error is statistical only.
runs	Dial angle	Calculated angle	chi2	comments
angle	Polarization %	angle	Polarization %
8374-8375	90.5	0.5 uA	-	-	-	thresholds=136mV, raster OFF
8364-8371	22.5	-68.46+/-0.26	18.8	66.8+/-0.25	3.5	0.5uA, open collimator
8376-8383	163.0	-63.79+/-0.22	162.1	64.1+/-0.22	3.5
Average	-	-66.10+/-0.20	-	65.5+/-0.20	-	Av:-65.8+/-0.20

The full information is given here .

It occured that at the run 8367 the Wien settings were changed! This seems to increase the polarization by 2%.

The final result: -65.8 +/- 0.20(stat) +/- 3.0(syst-prelim) -2%(Wien filter messed up) (1/2 wave plate OUT)

12 April 2000 13:30-18:30.

The beam energy is 4.234 GeV (MCC) or ?? (EP), one linac is N=0.4185 S=0.4185, inj=0.04708. The injector angle is 39.0^o, the 1/2 wave plate was OUT.

The laser phase was at 4.9^o. The beam current dependence on the phase is given on the plot. The slit was at 2 settings: 16., attenuator at 70 and the open slit and attenuator at 500 and the slit at 16.2. The former setting happens to add much of cross-talk from halls B and/or C which dilutes the polarization by about 15%.

Mott: 73+/-0.5+/-2% (see ELOG)

Supermendur target P=7.6%. Target Angles and Beam Polarizations. The theta acceptance is about +/-15^o? and the mean analysing power is 0.76. The error is statistical only.
runs Dial angle Calculated angle chi2 comments
angle Polarization % angle Polarization %

8403-8404 90.5 0.5 uA - - - thr=136mV, raster ON, atten=500

8395-8402 23.0 -82.85+/-0.23 19.2 -80.76+/-0.23 1.0 0.5uA, open collimator

8405-8412 163.5 -79.69+/-0.21 162.0 -80.30+/-0.21 2.0 Wien at 39^o

Average - -81.30+/-0.17 - -80.50+/-0.17 - Av:-80.9+/-0.17

8387-8394 23.0 -62.63+/-0.24 - - 3.0 att=70, open slit

8416-8427 163.5 -67.90+/-0.19 - - 1.3 att=70, open slit

Average - -65.20+/-0.17 - - -

8416-8427 163.5 -67.90+/-0.19 - - 1.3 att=70, open slit

8428-8433 163.5 -79.20+/-0.26 - - 1.0 att=70, lasers B,C off

8434-8435 163.5 rate 0.2% - - - att=500,slit 16.0, laser A off

8441-8448 163.5 +58.30+/-0.7 rate=10% - - att=70,slit open, laser A off

8449-8456 163.5 -78.74+/-0.21 - - 0.7 att=500, slit 16.

8465-8468 90.5 - - - att=500, Wien=47^o

8457-8463 163.5 -76.73+/-0.21 161.5 -77.60+/-0.23 0.6 att=500, Wien=47^o

8469-8476 23.0 -81.52+/-0.22 19.1 -79.40+/-0.22 0.6

Average - -79.20+/-0.17 - -78.50+/-0.17 - Av:-78.9+/-0.17

Supermendur target P=7.6%. Target Angles and Beam Polarizations. The theta acceptance is about +/-15^o? and the mean analysing power is 0.76. The error is statistical only.
runs	Dial angle	Calculated angle	chi2	comments
angle	Polarization %	angle	Polarization %
8403-8404	90.5	0.5 uA	-	-	-	thr=136mV, raster ON, atten=500
8395-8402	23.0	-82.85+/-0.23	19.2	-80.76+/-0.23	1.0	0.5uA, open collimator
8405-8412	163.5	-79.69+/-0.21	162.0	-80.30+/-0.21	2.0	Wien at 39^o
Average	-	-81.30+/-0.17	-	-80.50+/-0.17	-	Av:-80.9+/-0.17
8387-8394	23.0	-62.63+/-0.24	-	-	3.0	att=70, open slit
8416-8427	163.5	-67.90+/-0.19	-	-	1.3	att=70, open slit
Average	-	-65.20+/-0.17	-	-	-
8416-8427	163.5	-67.90+/-0.19	-	-	1.3	att=70, open slit
8428-8433	163.5	-79.20+/-0.26	-	-	1.0	att=70, lasers B,C off
8434-8435	163.5	rate 0.2%	-	-	-	att=500,slit 16.0, laser A off
8441-8448	163.5	+58.30+/-0.7	rate=10%	-	-	att=70,slit open, laser A off
8449-8456	163.5	-78.74+/-0.21	-	-	0.7	att=500, slit 16.
8465-8468	90.5	-	-	-		att=500, Wien=47^o
8457-8463	163.5	-76.73+/-0.21	161.5	-77.60+/-0.23	0.6	att=500, Wien=47^o
8469-8476	23.0	-81.52+/-0.22	19.1	-79.40+/-0.22	0.6
Average	-	-79.20+/-0.17	-	-78.50+/-0.17	-	Av:-78.9+/-0.17

The full information is given here .

A strong cross-talk of from halls B,C was found. The polarization could be diluted by 15%. The polarization should be measured at a low laser attenuation (500)!

The Wien filter angle change did not produce a significant change in polarization. With the last setting of 47^o (suggested by Jay Benesch on the basis of the energy evaluation) the polarization seems to be 2% absolute lower than at 39^o.

The final result: -78.9 +/- 0.17(stat) +/- 3.0(syst-prelim) (1/2 wave plate OUT, 47^o Wien angle)

16 April 2000 11:00-13:30.

The beam energy is 4.234 GeV (MCC) or ?? (EP), one linac is N=0.4185 S=0.4185, inj=0.04708. The injector angle is 47.0^o, the 1/2 wave plate was OUT.

The laser phase was at 7.9^o. Mott: 73+/-0.5+/-2% (see ELOG)

Supermendur target P=7.6%. Target Angles and Beam Polarizations. The theta acceptance is about +/-15^o? and the mean analysing power is 0.76. The error is statistical only.
runs	Dial angle	Calculated angle	chi2	comments
angle	Polarization %	angle	Polarization %
8509-8510	90.5	0.5 uA	-	-	-	thr=136mV, raster ON, atten=600
8511-8516	23.0	-80.31+/-0.24	19.8	-78.00+/-0.24	0.8	0.5uA, open collimator
8503-8508	163.5	-76.60+/-0.24	161.6	-77.45+/-0.24	1.6
Average	-	-78.45+/-0.17	-	-78.00+/-0.17	-	Av:-78.2+/-0.2

The full information is given here .

The final result: -78.2 +/- 0.2(stat) +/- 3.0(syst-prelim) (1/2 wave plate OUT, 47^o Wien angle)

19 April 2000 11:00-13:30.

The beam energy is 4.234 GeV (MCC) or ?? (EP), one linac is N=0.4185 S=0.4185, inj=0.04708. The injector angle is 47.0^o, the 1/2 wave plate was OUT.

The laser phase was at 7.9^o. Mott: 73+/-0.5+/-2% (see ELOG)

Supermendur target P=7.6%. Target Angles and Beam Polarizations. The theta acceptance is about +/-15^o? and the mean analysing power is 0.76. The error is statistical only.
runs Dial angle Calculated angle chi2 comments
angle Polarization % angle Polarization %

8525-8526 90.5 0.58 uA - - - thr=136mV, raster ON, atten=600

8521-8524 23.0 -79.92+/-0.24 19.3 -77.95+/-0.24 1.2 0.58uA, open collimator

8527-8530 163.5 -75.93+/-0.22 162.1 -76.31+/-0.24 0.5

Average - -77.92+/-0.17 - -77.10+/-0.17 - Av:-77.6+/-0.17

8531-8531 163.5 0.58uA thre=136mV - LED, dtim = 2.7%

8536-8536 163.5 0.24uA thre=136mV - LED, dtim = 1.1%

8538-8539 90.5 0.24 uA - - - thr=136mV, raster ON, atten=600

8540-8543 23.0 -78.73+/-0.36 19.6 -76.93+/-0.36 2.7 0.24uA,

8532-8535 163.5 -74.23+/-0.30 161.1 -75.03+/-0.24 0.3 0.24uA

Average - -76.50+/-0.25 - -75.98+/-0.25 - Av:-76.2+/-0.25

8544-8547 23.0 -79.57+/-0.22 3.5 0.59uA,

Supermendur target P=7.6%. Target Angles and Beam Polarizations. The theta acceptance is about +/-15^o? and the mean analysing power is 0.76. The error is statistical only.
runs	Dial angle	Calculated angle	chi2	comments
angle	Polarization %	angle	Polarization %
8525-8526	90.5	0.58 uA	-	-	-	thr=136mV, raster ON, atten=600
8521-8524	23.0	-79.92+/-0.24	19.3	-77.95+/-0.24	1.2	0.58uA, open collimator
8527-8530	163.5	-75.93+/-0.22	162.1	-76.31+/-0.24	0.5
Average	-	-77.92+/-0.17	-	-77.10+/-0.17	-	Av:-77.6+/-0.17
8531-8531	163.5		0.58uA	thre=136mV	-	LED, dtim = 2.7%
8536-8536	163.5		0.24uA	thre=136mV	-	LED, dtim = 1.1%
8538-8539	90.5	0.24 uA	-	-	-	thr=136mV, raster ON, atten=600
8540-8543	23.0	-78.73+/-0.36	19.6	-76.93+/-0.36	2.7	0.24uA,
8532-8535	163.5	-74.23+/-0.30	161.1	-75.03+/-0.24	0.3	0.24uA
Average	-	-76.50+/-0.25	-	-75.98+/-0.25	-	Av:-76.2+/-0.25
8544-8547	23.0	-79.57+/-0.22			3.5	0.59uA,

The full information is given here .

The final result: -77.6 +/- 0.2(stat) +/- 3.0(syst-prelim) (1/2 wave plate OUT, 47^o Wien angle)

23 April 2000 19:00-22:00.

The beam energy is 4.234 GeV (MCC) or ?? (EP), one linac is N=0.4185 S=0.4185, inj=0.04708. The injector angle is 47.0^o, the 1/2 wave plate was OUT.

BCM V to F converters did not work. A different converter was used.

The laser phase was at 7.1^o.

Mott: 73+/-0.5+/-2% (see ELOG)

Supermendur target P=7.6%. Target Angles and Beam Polarizations. The theta acceptance is about +/-15^o? and the mean analysing power is 0.76. The error is statistical only.
runs	Dial angle	Calculated angle	chi2	comments
angle	Polarization %	angle	Polarization %
8569-8571	90.5	0.58 uA?	-	-	-	thr=136mV, raster ON, atten=600
8561-8568	23.0					0.58uA ?, open collimator
8587-8588	23.0	-79.72+/-0.25	19.3 ?	-77.90+/-0.25	11.
8573-8585	163.5	-76.19+/-0.20	162.1 ?	-77.21+/-0.20	3.7
Average	-	-78.0 +/-0.3	-	-77.6 +/-0.3	-	Av:-77.8+/-0.3

The full information is given here .

A the results were not very stable, in particularly at the forward target angle. It is reflected in the chi2 of the measurement. The statistical error is increased to 0.3 in order to account for high chi2.

The final result: -77.8 +/- 0.3(stat) +/- 3.0(syst-prelim) (1/2 wave plate OUT, 47^o Wien angle)

03 May 2000 18:00-20:00.

The beam energy is 4.234 GeV (MCC) or ?? (EP), one linac is N=0.4185 S=0.4185, inj=0.04708. The injector angle is 42.7^o, the 1/2 wave plate was OUT.

The laser phase was at 1.5^o. The beam current dependence on the phase is given on the plot.

Mott: 73+/-0.5+/-2% (see ELOG)

Supermendur target P=7.6%. Target Angles and Beam Polarizations. The theta acceptance is about +/-15^o? and the mean analysing power is 0.76. The error is statistical only.
runs	Dial angle	Calculated angle	chi2	comments
angle	Polarization %	angle	Polarization %
8602-8603	90.5	0.51 uA?	-	-	-	thr=136mV, raster ON, atten=600
8594-8601	23.0	-80.51+/-0.25	19.4	-78.57+/-0.25	1.4
8604-8611	163.5	-77.97+/-0.23	161.8	-78.70+/-0.25	1.7
Average	-	-79.23+/-0.17	-	-78.63+/-0.17	-	Av:-79.0+/-0.2
8604-8611	163.5	-78.68+/-0.20			1.1	Laser phase=11^o

The full information is given here .

The final result: -79.0 +/- 0.2(stat) +/- 3.0(syst-prelim) (1/2 wave plate OUT, 42.7^o Wien angle)

05 May 2000 15:30-18:30.

The beam energy is 4.234 GeV (MCC) or ?? (EP), one linac is N=0.4185 S=0.4185, inj=0.04708. The injector angle is 42.7^o, the 1/2 wave plate was OUT.

The laser phase was at 1.5^o.

Mott: 73+/-0.5+/-2% (see ELOG)

Supermendur target P=7.6%. Target Angles and Beam Polarizations. The theta acceptance is about +/-15^o? and the mean analysing power is 0.76. The error is statistical only.
runs	Dial angle	Calculated angle	chi2	comments
angle	Polarization %	angle	Polarization %
8633-8634	90.5	0.51uA	-	-	-	thr=136mV, raster ON, atten=600
8625-8632	23.0	-81.56+/-0.25	19.3	-79.54+/-0.25	1.9
8635-8642	163.5	-78.21+/-0.23	161.8	-78.94+/-0.23	0.4
Average	-	-79.89+/-0.18	-	-79.24+/-0.18	-	Av:-79.57+/-0.218
8643-8643	163.5	0.52uA				LED: dtime=2.4%
8644-8644	163.5	1.60uA				LED: dtime=7.8%
8645-8648	163.5	-79.33+/-0.21			0.2	1.6uA
8649-8656	163.5	-76.59+/-0.23			0.6	0.51uA, after recesiation

The full information is given here .

Before recesiation:
The final result: -79.6 +/- 0.2(stat) +/- 2.4(syst-prelim) (1/2 wave plate OUT, 42.7^o Wien angle)

After recesiation:
The final result: -77.9 +/- 0.3(stat) +/- 2.4(syst-prelim) (1/2 wave plate OUT, 42.7^o Wien angle), scaled from the measurements at 163.5^o

09 May 2000 21:30-24:30.

The beam energy is 3.395 GeV (MCC) or ?? (EP), one linac is N=0.4185 S=0.4185, inj=0.04708. The injector angle is 24.4^o, the 1/2 wave plate was OUT.

The laser phase was at 3.0^o. The beam current dependence on the phase is given on the plot.

Mott: 73+/-0.5+/-2% (see ELOG)

Supermendur target P=7.6%. Target Angles and Beam Polarizations. The theta acceptance is about +/-15^o? and the mean analysing power is 0.76. The error is statistical only.
runs Dial angle Calculated angle chi2 comments
angle Polarization % angle Polarization %

8677-8678 90.5 0.51uA - - - thr=136mV, raster ON, atten=600

8659-8664 23.0 74.47+/-0.29 - - 2.1 beam x,y=0

8665-8668 23.0 74.14+/-0.34 - - 0.1 beam x=-1.5mm,y=0

8669-8670 23.0 75.50+/-0.50 - - 1.5 beam x=+1.5mm,y=0

8671-8676 23.0 74.07+/-0.28 - - 0.6 beam x,y=0

8659-8676 23.0 74.36+/-0.16 19.4? 72.57+/-0.16 1.3 average over all

8679-8688 163.5 68.75+/-0.21 161.8? 69.39+/-0.21 2.3 -

Average - 71.50+/-0.15 - 71.00+/-0.15 - Av: 71.2+/-0.2

8679-8682 163.5 69.40+/-0.23 - - 1.3 beam x,y=0

8683-8684 163.5 68.58+/-0.46 - - 1.3 beam x,y=+1.5mm

8685-8688 163.5 68.19+/-0.33 - - 3.2 beam x,y=-1.5mm

8689-8692 154.0 65.87+/-0.42 152.0 67.05+/-0.42 0.3 beam x,y=0

8693-8694 163.5 68.49+/-0.63 - - 1.3 beam x,y=0 , beam 0.3uA

8695-8695 163.5 0.31uA - - - LED: dtime=2.4%

Supermendur target P=7.6%. Target Angles and Beam Polarizations. The theta acceptance is about +/-15^o? and the mean analysing power is 0.76. The error is statistical only.
runs	Dial angle	Calculated angle	chi2	comments
angle	Polarization %	angle	Polarization %
8677-8678	90.5	0.51uA	-	-	-	thr=136mV, raster ON, atten=600
8659-8664	23.0	74.47+/-0.29	-	-	2.1	beam x,y=0
8665-8668	23.0	74.14+/-0.34	-	-	0.1	beam x=-1.5mm,y=0
8669-8670	23.0	75.50+/-0.50	-	-	1.5	beam x=+1.5mm,y=0
8671-8676	23.0	74.07+/-0.28	-	-	0.6	beam x,y=0
8659-8676	23.0	74.36+/-0.16	19.4?	72.57+/-0.16	1.3	average over all
8679-8688	163.5	68.75+/-0.21	161.8?	69.39+/-0.21	2.3	-
Average	-	71.50+/-0.15	-	71.00+/-0.15	-	Av: 71.2+/-0.2
8679-8682	163.5	69.40+/-0.23	-	-	1.3	beam x,y=0
8683-8684	163.5	68.58+/-0.46	-	-	1.3	beam x,y=+1.5mm
8685-8688	163.5	68.19+/-0.33	-	-	3.2	beam x,y=-1.5mm
8689-8692	154.0	65.87+/-0.42	152.0	67.05+/-0.42	0.3	beam x,y=0
8693-8694	163.5	68.49+/-0.63	-	-	1.3	beam x,y=0 , beam 0.3uA
8695-8695	163.5	0.31uA	-	-	-	LED: dtime=2.4%

The full information is given here .

The final result: 71.2 +/- 0.2(stat) +/- 2.4(syst-prelim) (1/2 wave plate OUT, 24.4^o Wien angle)

At low target angles (about 20^o) the beam is scraping over something, which causes a high counting rates. The rate at 90^o and 154^o look normal. Moving the beam in X,Y did not help. However, the polarization does not look affected.
It occured later that the OTR was in during our measurements.

The polarization at 154^o is lower. Perhaps it is an influence of the transverse polarization or a smaller target polarization.

The Wien angle should provide the spin angle of 14^o (cos(14^o)=0.97).

12 May 2000 9:30-12:30.

The beam energy is 0.884 GeV (MCC) or ?? (EP), one linac is N=0.4185 S=0.4185, inj=0.04708. The injector angle is 96.3^o, the 1/2 wave plate was OUT.

The laser phase was at 3.1^o.

Mott: 73+/-0.5+/-2% (see ELOG)

Supermendur target P=7.6%. Target Angles and Beam Polarizations. The theta acceptance is about +/-13^o? and the mean analysing power is 0.774?. The error is statistical only.
runs Dial angle Calculated angle chi2 comments
angle Polarization % angle Polarization %

8720-8721 90.5 0.27uA - - - thr=140mV, raster ON, atten=565

8706-8711 23.0 -81.87+/-0.44 19.1 -79.75+/-0.44 1.6 thr=140mV

8722-8727 163.0 -79.25+/-0.35 162.0 -79.90+/-0.35 0.8 thr=140mV

Average - -80.56+/-0.27 - -79.82+/-0.27 - Av: -80.2+/-0.3

8702-8705 23.0 -81.1+/-0.6 - 0.94 thr=120mV

8712-8715 23.0 -82.9+/-0.5 - 1.3 thr=160mV

8716-8719 23.0 -83.0+/-0.5 - 2.0 thr=190mV

8728-8728 163.5 0.27uA - - - LED: dtime=4.8%

Supermendur target P=7.6%. Target Angles and Beam Polarizations. The theta acceptance is about +/-13^o? and the mean analysing power is 0.774?. The error is statistical only.
runs	Dial angle	Calculated angle	chi2	comments
angle	Polarization %	angle	Polarization %
8720-8721	90.5	0.27uA	-	-	-	thr=140mV, raster ON, atten=565
8706-8711	23.0	-81.87+/-0.44	19.1	-79.75+/-0.44	1.6	thr=140mV
8722-8727	163.0	-79.25+/-0.35	162.0	-79.90+/-0.35	0.8	thr=140mV
Average	-	-80.56+/-0.27	-	-79.82+/-0.27	-	Av: -80.2+/-0.3
8702-8705	23.0	-81.1+/-0.6		-	0.94	thr=120mV
8712-8715	23.0	-82.9+/-0.5		-	1.3	thr=160mV
8716-8719	23.0	-83.0+/-0.5		-	2.0	thr=190mV
8728-8728	163.5	0.27uA	-	-	-	LED: dtime=4.8%

The full information is given here .

The final result: -80.2 +/- 0.3(stat) +/- 3.0(syst-prelim) (1/2 wave plate OUT, 96.2^o Wien angle)

23 May 2000 17:30-20:00.

The beam energy is 4.535 GeV (MCC) or ?? (EP), one linac is N=0.5590 S=0.5590, inj=0.06289. The injector angle is 72.1^o, the 1/2 wave plate was OUT.

The laser phase was at 7.4^o.

Mott: 73+/-0.5+/-2% (see ELOG)

Supermendur target P=7.6%. Target Angles and Beam Polarizations. The theta acceptance is about +/-15^o? and the mean analysing power is 0.76?. The error is statistical only.
runs Dial angle Calculated angle chi2 comments
angle Polarization % angle Polarization %

8743-8744 90.5 0.36uA - - - thr=140mV, raster OFF, atten=600

8737-8743 23.0 81.25+/-0.25 20.2 79.69+/-0.25 2.2 thr=140mV

8745-8750 163.0 78.00+/-0.23 162.5 78.42+/-0.23 1.1 thr=140mV

Average - 79.62+/-0.17 - 79.05+/-0.17 - Av: 79.34+/-0.17

8753-8756 163.0 79.56+/-0.17 0.5 beam 1.04uA att=600

8761-8764 163.0 78.80+/-0.19 0.2 beam 0.78uA att=350

8765-8768 163.0 78.26+/-0.26 2.3 beam 0.40uA att=200

8772-8775 163.0 78.04+/-0.26 0.1 beam 0.44uA att=600

8758-8759 163.5 1.04uA - - - LED: dtime=5.0%

8760-8760 163.5 0.78uA - - - LED: dtime=3.7%

8770-8770 163.5 0.40uA - - - LED: dtime=1.8%

8771-8771 163.5 0.44uA - - - LED: dtime=2.1%

Supermendur target P=7.6%. Target Angles and Beam Polarizations. The theta acceptance is about +/-15^o? and the mean analysing power is 0.76?. The error is statistical only.
runs	Dial angle	Calculated angle	chi2	comments
angle	Polarization %	angle	Polarization %
8743-8744	90.5	0.36uA	-	-	-	thr=140mV, raster OFF, atten=600
8737-8743	23.0	81.25+/-0.25	20.2	79.69+/-0.25	2.2	thr=140mV
8745-8750	163.0	78.00+/-0.23	162.5	78.42+/-0.23	1.1	thr=140mV
Average	-	79.62+/-0.17	-	79.05+/-0.17	-	Av: 79.34+/-0.17
8753-8756	163.0	79.56+/-0.17			0.5	beam 1.04uA att=600
8761-8764	163.0	78.80+/-0.19			0.2	beam 0.78uA att=350
8765-8768	163.0	78.26+/-0.26			2.3	beam 0.40uA att=200
8772-8775	163.0	78.04+/-0.26			0.1	beam 0.44uA att=600
8758-8759	163.5	1.04uA	-	-	-	LED: dtime=5.0%
8760-8760	163.5	0.78uA	-	-	-	LED: dtime=3.7%
8770-8770	163.5	0.40uA	-	-	-	LED: dtime=1.8%
8771-8771	163.5	0.44uA	-	-	-	LED: dtime=2.1%

The full information is given here .

The final result: 79.34 +/- 0.17(stat) +/- 2.4(syst-prelim) (1/2 wave plate OUT, 72.1^o Wien angle)

02 June 2000 17:30-22:00.

The beam energy is 4.535 GeV (MCC) or ?? (EP), one linac is N=0.5590 S=0.5590, inj=0.06289. The injector angle is 72.1^o, the 1/2 wave plate was OUT.

The laser phase was at 11.5^o.

Mott: 73+/-0.5+/-2% (see ELOG)

The beam deflection at the last BPM (1H04B) was measured. The dipole was set to 5.65 GeV. The beam shifted in Y from -0.84 to -4.1mm, so the net shift was -3.26mm. For 5.65 GeV beam one should expect an additional deflection of -2.6mm with respect to the 4.5 GeV. The absolute position should be about -3.5mm with the same tune as we have now.

Supermendur target P=7.6%. Target Angles and Beam Polarizations. The theta acceptance is about +/-15^o? and the mean analysing power is 0.76?. The error is statistical only.
runs Dial angle Calculated angle chi2 comments
angle Polarization % angle Polarization %

8789-8790 90.5 0.55uA - - - thr=140mV, raster ON , atten=600

8783-8788 23.0 81.66+/-0.21 19.4 79.69+/-0.21 0.8 thr=140mV

8791-8796 163.0 78.44+/-0.20 162.1 79.03+/-0.20 0.4 thr=140mV

Average - 80.05+/-0.17 - 79.36+/-0.17 - Av: 79.70+/-0.17

8797-8797 163.0 0.55uA - - - LED: dtime=2.7%

8798-8798 163.0 1.08uA - - - LED: dtime=5.1%

8799-8804 163.0 79.16+/-0.14 0.6 beam 1.08uA att=600

Supermendur target P=7.6%. Target Angles and Beam Polarizations. The theta acceptance is about +/-15^o? and the mean analysing power is 0.76?. The error is statistical only.
runs	Dial angle	Calculated angle	chi2	comments
angle	Polarization %	angle	Polarization %
8789-8790	90.5	0.55uA	-	-	-	thr=140mV, raster ON , atten=600
8783-8788	23.0	81.66+/-0.21	19.4	79.69+/-0.21	0.8	thr=140mV
8791-8796	163.0	78.44+/-0.20	162.1	79.03+/-0.20	0.4	thr=140mV
Average	-	80.05+/-0.17	-	79.36+/-0.17	-	Av: 79.70+/-0.17
8797-8797	163.0	0.55uA	-	-	-	LED: dtime=2.7%
8798-8798	163.0	1.08uA	-	-	-	LED: dtime=5.1%
8799-8804	163.0	79.16+/-0.14			0.6	beam 1.08uA att=600

The full information is given here .

The final result: 79.70 +/- 0.17(stat) +/- 2.4(syst-prelim) (1/2 wave plate OUT, 72.1^o Wien angle)

09 June 2000 10:30-12:30.

The beam energy is 4.535 GeV (MCC) or ?? (EP), one linac is N=0.5590 S=0.5590, inj=0.06289. The injector angle is 72.1^o, the 1/2 wave plate was OUT.

The laser phase was at 13.4^o.

Mott: 73+/-0.5+/-2% (see ELOG)

Supermendur target P=7.6%. Target Angles and Beam Polarizations. The theta acceptance is about +/-15^o? and the mean analysing power is 0.76?. The error is statistical only.
runs Dial angle Calculated angle chi2 comments
angle Polarization % angle Polarization %

8817-8818 90.5 0.55uA - - - thr=140mV, raster ON , atten=600

8811-8816 22.5 80.94+/-0.20 18.5 78.85+/-0.20 1.3 thr=140mV

8819-8824 163.5 76.69+/-0.20 161.7 77.45+/-0.20 0.6 thr=140mV

Average - 78.81+/-0.15 - 78.15+/-0.15 - Av: 78.48+/-0.17

8825-8825 163.5 0.55uA - - - LED: dtime=2.6%

8826-8840 163.0 0.55uA - - - HV study for Apperture counters

8799-8804 163.0 79.16+/-0.14 0.6 beam 1.08uA att=600

Supermendur target P=7.6%. Target Angles and Beam Polarizations. The theta acceptance is about +/-15^o? and the mean analysing power is 0.76?. The error is statistical only.
runs	Dial angle	Calculated angle	chi2	comments
angle	Polarization %	angle	Polarization %
8817-8818	90.5	0.55uA	-	-	-	thr=140mV, raster ON , atten=600
8811-8816	22.5	80.94+/-0.20	18.5	78.85+/-0.20	1.3	thr=140mV
8819-8824	163.5	76.69+/-0.20	161.7	77.45+/-0.20	0.6	thr=140mV
Average	-	78.81+/-0.15	-	78.15+/-0.15	-	Av: 78.48+/-0.17
8825-8825	163.5	0.55uA	-	-	-	LED: dtime=2.6%
8826-8840	163.0	0.55uA	-	-	-	HV study for Apperture counters
8799-8804	163.0	79.16+/-0.14			0.6	beam 1.08uA att=600

The full information is given here .

The final result: 78.50 +/- 0.15(stat) +/- 2.4(syst-prelim) (1/2 wave plate OUT, 72.1^o Wien angle)

Since the counting rate on the left apperture counter was about half of the right arm, we checked the HV. The results are presented on the plot. We have to raise the HV on App.Left to at least 1900V.

14 June 2000 00:00-01:00.

The beam energy is 4.535 GeV (MCC) or ?? (EP), one linac is N=0.5590 S=0.5590, inj=0.06289. The injector angle is 72.1^o, the 1/2 wave plate was OUT.

The laser phase was at 13.2^o.

Mott: 74% - private communication

Supermendur target P=7.6%. Target Angles and Beam Polarizations. The theta acceptance is about +/-15^o? and the mean analysing power is 0.76?. The error is statistical only.
runs	Dial angle	Calculated angle	chi2	comments
angle	Polarization %	angle	Polarization %
8849-8850	90.5	0.55uA	-	-	-	thr=140mV, raster ON , atten=600
8843-8848	23.0	78.25+/-0.15	20.3	76.80+/-0.15	1.0	thr=140mV
8851-8856	163.5	74.59+/-0.14	161.1	75.40+/-0.14	2.2	thr=140mV
Average	-	76.42+/-0.11	-	76.10+/-0.11	-	Av: 76.25+/-0.11
8857-8857	163.5	0.55uA	-	-	-	LED: dtime=3.1%

The full information is given here .

The final result: 76.25 +/- 0.11(stat) +/- 2.4(syst-prelim) (1/2 wave plate OUT, 72.1^o Wien angle)

19 June 2000 21:20-22:40.

The beam energy is 4.535 GeV (MCC) or ?? (EP), one linac is N=0.5590 S=0.5590, inj=0.06289. The injector angle is 72.1^o, the 1/2 wave plate was OUT.

The laser phase was at 13.3^o.

Supermendur target P=7.6%. Target Angles and Beam Polarizations. The theta acceptance is about +/-15^o? and the mean analysing power is 0.76?. The error is statistical only.
runs	Dial angle	Calculated angle	chi2	comments
angle	Polarization %	angle	Polarization %
8866-8867	90.5	0.55uA	-	-	-	thr=140mV, raster ON , atten=600
8860-8865	23.0	76.47+/-0.15	20.5	75.15+/-0.15	2.2	thr=140mV
8868-8873	163.5	72.26+/-0.14	161.6	73.02+/-0.14	1.4	thr=140mV
Average	-	74.36+/-0.10	-	74.08+/-0.10	-	Av: 74.22+/-0.10
8874-8874	163.5	0.55uA	-	-	-	LED: dtime=3.0%

The full information is given here .

The final result: 74.22 +/- 0.10(stat) +/- 2.4(syst-prelim) (1/2 wave plate OUT, 72.1^o Wien angle)

23 June 2000 19:00-20:00.

The beam energy is 4.535 GeV (MCC) or ?? (EP), one linac is N=0.5590 S=0.5590, inj=0.06289. The injector angle is 72.2^o, the 1/2 wave plate was OUT.

The laser phase was at 13.5^o.

Supermendur target P=7.6%. Target Angles and Beam Polarizations. The theta acceptance is about +/-15^o? and the mean analysing power is 0.76?. The error is statistical only.
runs	Dial angle	Calculated angle	chi2	comments
angle	Polarization %	angle	Polarization %
8881-8882	90.5	0.55uA	-	-	-	thr=140mV, raster ON , atten=600
8877-8880	23.0	80.43+/-0.15	20.5	79.04+/-0.19	2.5	thr=140mV
8883-8886	163.5	76.92+/-0.17	160.8	78.10+/-0.17	0.8	thr=140mV
Average	-	78.68+/-0.12	-	78.57+/-0.12	-	Av: 78.62+/-0.12
8887-8887	163.5	0.55uA	-	-	-	LED: dtime=2.7%

The full information is given here .

The final result: 78.62 +/- 0.12(stat) +/- 2.4(syst-prelim) (1/2 wave plate OUT, 72.1^o Wien angle)

26 June 2000 19:20-20:40.

The beam energy is 4.535 GeV (MCC) or ?? (EP), one linac is N=0.5590 S=0.5590, inj=0.06289. The injector angle is 72.2^o, the 1/2 wave plate was OUT.

The laser phase was at 13.3^o.

Supermendur target P=7.6%. Target Angles and Beam Polarizations. The theta acceptance is about +/-15^o? and the mean analysing power is 0.76?. The error is statistical only.
runs	Dial angle	Calculated angle	chi2	comments
angle	Polarization %	angle	Polarization %
8898-8899	90.5	0.55uA	-	-	-	thr=140mV, raster ON , atten=600
8890-8897	23.0	80.39+/-0.16	20.5	79.00+/-0.16	2.0	thr=140mV
8900-8905	163.5	76.77+/-0.15	161.0	77.85+/-0.15	2.2	thr=140mV
Average	-	78.58+/-0.11	-	78.42+/-0.11	-	Av: 78.50+/-0.11
8906-8906	163.5	0.55uA	-	-	-	LED: dtime=2.8%

The full information is given here .

The final result: 78.50 +/- 0.11(stat) +/- 2.4(syst-prelim) (1/2 wave plate OUT, 72.1^o Wien angle)

10-12 July 2000 03:40 10 July - 9:00 12 July . Spin dance.

The beam energy is 5.65289 GeV (MCC) or ?? (EP), one linac is N=0.5590 S=0.5590, inj=0.06289. The injector angle is -8.9^o (start), the 1/2 wave plate was OUT.

The laser phase was at 13.4^o.

Supermendur target P=7.76%. Target Angles and Beam Polarizations. The theta acceptance is about +/-15^o? and the mean analysing power is 0.76?. The error is statistical only.
runs Wien ^o Dial angle Calculated angle chi2 comments
angle Polarization % angle Polarization %

8921-8922 -8.9 90.5 0.48uA - - - thr=140mV, raster ON, laser DC

8916-8919 23.0 76.81+/-0.19 20.7 75.58+/-0.19 1.0 thr=140mV

8923-8928 163.5 75.18+/-0.15 161.9 75.84+/-0.15 0.8 thr=140mV, 0.48uA

Average - 76.00+/-0.14 - 75.71+/-0.14 - Av: 75.85+/-0.14

8931-8931 163.5 - 0.48uA - - LED: dtime=2.2%

8934-8939 163.5 75.80+/-0.19 0.12uA - 1.8 thr=140mV,

8940-8940 163.5 - 0.12uA - - LED: dtime=0.6%

8942-8947 163.5 73.48+/-0.13 1.48uA - 1.6 thr=140mV

8948-8948 163.5 - 1.48uA - - LED: dtime=6.9%

8950-8953 163.5 74.61+/-0.13 0.93uA - 2.6 thr=140mV

8949-8949 163.5 - 0.93uA - - LED: dtime=3.4%

8955-8968 163.5 75.98+/-0.13 0.31uA - 2.8 thr=140mV, 0.30uA

8966-8966 163.5 - 0.31uA - - LED: dtime=1.4%

8977-8978 90.5 - 0.62uA - - thr=140mV, raster ON, laser RF

8971-8976 23.0 74.72+/-0.15 20.6 73.48+/-0.15 1.0 thr=140mV

8979-8984 163.5 72.34+/-0.13 161.3 73.23+/-0.13 0.8 thr=140mV, 0.62uA

Average - 73.53+/-0.10 - 73.35+/-0.10 - Av: 73.44+/-0.10

8985-8985 163.5 - 0.62uA - - LED: dtime=2.3%

8990-8991 55.7 90.5 - 0.50uA - - thr=140mV, raster ON, laser DC

8986-8989 23.0 40.73+/-0.19 20.4 40.00+/-0.19 0.1 thr=140mV

8992-8995 163.5 33.51+/-0.17 161.5 33.88+/-0.17 1.6 thr=140mV, 0.50uA

Average - 37.12+/-0.14 - 36.94+/-0.14 - Av: 37.02+/-0.14

8996-8996 163.5 - 0.50uA - - LED: dtime=2.3%

9004-9005 107.0 90.5 - 0.50uA - - thr=140mV, raster ON, laser DC

9006-9011 23.0 -30.05+/-0.14 20.5 -29.53+/-0.14 1.6 thr=140mV

8998-9003 163.5 -35.18+/-0.14 161.5 -35.57+/-0.14 0.3 thr=140mV, 0.50uA

Average - -32.62+/-0.10 - -32.55+/-0.14 - Av: 32.58+/-0.10

9015-9020 91.2 23.0 -6.25+/-0.15 20.5 -6.14+/-0.15 6.8 thr=140mV, laser DC

9021-9034 163.5 -12.81+/-0.10 161.5 -13.03+/-0.10 2.0 thr=140mV, 0.50uA

Average - -9.53+/-0.11 - -9.53+/-0.11 - Av: -9.56+/-0.11

9015-9020 23.0 -4.94+/-0.18 20.5 -4.85+/-0.18 5.2 thr=140mV, laser RF

9021-9034 163.5 -11.77+/-0.17 161.5 -11.97+/-0.17 2.0 thr=140mV, 0.50uA

Average - -8.36+/-0.14 - -8.41+/-0.14 - Av: -8.38+/-0.14

9058-9063 76.1 22.5 16.68+/-0.15 20.0 16.40+/-0.15 1.8 thr=140mV, laser DC

9053-9056 163.5 8.08+/-0.18 161.5 8.23+/-0.18 5.1 thr=140mV, 0.50uA

Average - 12.38+/-0.14 - 12.32+/-0.14 - Av: 12.35+/-0.14

9068-9069 36.1 90.5 - 0.50uA - - thr=140mV, raster ON, laser DC

9064-9067 22.5 64.44+/-0.19 19.7 63.24+/-0.19 1.4 thr=140mV

9070-9075 163.5 57.29+/-0.14 161.3 57.99+/-0.14 3.6 thr=140mV, 0.50uA

Average - 60.87+/-0.13 - 60.62+/-0.13 - Av: 60.75+/-0.10

9086-9091 11.5 23.0 76.46+/-0.15 20.5 74.86+/-0.15 1.1 thr=140mV

9080-9085 163.5 72.46+/-0.14 161.5 73.25+/-0.14 1.7 thr=140mV, 0.50uA

Average - 74.46+/-0.13 - 75.06+/-0.13 - Av: 74.76+/-0.13

9092-9097 -8.7 23.0 76.92+/-0.15 20.5 75.31+/-0.15 1.1 thr=140mV, laser DC

9098-9103 163.5 75.44+/-0.14 161.5 76.27+/-0.14 1.7 thr=140mV, 0.50uA

Average - 76.18+/-0.13 - 75.79+/-0.13 - Av: 75.98+/-0.13

9104-9111 -8.7 23.0 75.40+/-0.13 20.5 74.10+/-0.13 3.8 thr=140mV, laser RF

9112-9119 163.5 73.69+/-0.12 161.5 74.77+/-0.12 1.7 thr=140mV, 0.50uA

Average - 74.68+/-0.11 - 74.43+/-0.11 - Av: 74.56+/-0.11

9120-9125 -56.9 23.0 44.07+/-0.15 20.5 43.31+/-0.13 0.9 thr=140mV, laser DC

9126-9131 163.5 48.21+/-0.14 161.5 48.74+/-0.14 0.8 thr=140mV, 0.50uA

Average - 46.14+/-0.11 - 46.03+/-0.11 - Av: 46.08+/-0.11

9138-9143 -81.6 23.0 9.03+/-0.17 20.5 8.87+/-0.17 1.5 thr=140mV, laser DC

9132-9137 163.5 17.60+/-0.14 161.5 17.79+/-0.14 21. thr=140mV, 0.50uA

Average - 13.31+/-0.13 - 13.33+/-0.13 - Av: 13.32+/-0.13

9144-9149 -106.0 23.0 -28.28+/-0.16 20.5 -27.79+/-0.17 7.7 thr=140mV, laser DC

9150-9159 163.5 -20.71+/-0.11 161.5 -20.94+/-0.11 8.1 thr=140mV, 0.50uA

Average - -24.50+/-0.15 - -24.36+/-0.15 - Av: -24.43+/-0.15

9160-9165 -106.0 23.0 0.45+/-0.18 - 5.3 thr=140mV, laser DC, Depolarizer

9150-9159 163.5 0.69+/-0.19 - 2.2 thr=140mV, 0.50uA

Average - 0.57+/-0.15 - - - -

Supermendur target P=7.76%. Target Angles and Beam Polarizations. The theta acceptance is about +/-15^o? and the mean analysing power is 0.76?. The error is statistical only.
runs	Wien ^o	Dial angle	Calculated angle	chi2	comments
angle	Polarization %	angle	Polarization %
8921-8922	-8.9	90.5	0.48uA	-	-	-	thr=140mV, raster ON, laser DC
8916-8919		23.0	76.81+/-0.19	20.7	75.58+/-0.19	1.0	thr=140mV
8923-8928		163.5	75.18+/-0.15	161.9	75.84+/-0.15	0.8	thr=140mV, 0.48uA
Average		-	76.00+/-0.14	-	75.71+/-0.14	-	Av: 75.85+/-0.14
8931-8931		163.5	-	0.48uA	-	-	LED: dtime=2.2%
8934-8939		163.5	75.80+/-0.19	0.12uA	-	1.8	thr=140mV,
8940-8940		163.5	-	0.12uA	-	-	LED: dtime=0.6%
8942-8947		163.5	73.48+/-0.13	1.48uA	-	1.6	thr=140mV
8948-8948		163.5	-	1.48uA	-	-	LED: dtime=6.9%
8950-8953		163.5	74.61+/-0.13	0.93uA	-	2.6	thr=140mV
8949-8949		163.5	-	0.93uA	-	-	LED: dtime=3.4%
8955-8968		163.5	75.98+/-0.13	0.31uA	-	2.8	thr=140mV, 0.30uA
8966-8966		163.5	-	0.31uA	-	-	LED: dtime=1.4%
8977-8978		90.5	-	0.62uA	-	-	thr=140mV, raster ON, laser RF
8971-8976		23.0	74.72+/-0.15	20.6	73.48+/-0.15	1.0	thr=140mV
8979-8984		163.5	72.34+/-0.13	161.3	73.23+/-0.13	0.8	thr=140mV, 0.62uA
Average		-	73.53+/-0.10	-	73.35+/-0.10	-	Av: 73.44+/-0.10
8985-8985		163.5	-	0.62uA	-	-	LED: dtime=2.3%
8990-8991	55.7	90.5	-	0.50uA	-	-	thr=140mV, raster ON, laser DC
8986-8989		23.0	40.73+/-0.19	20.4	40.00+/-0.19	0.1	thr=140mV
8992-8995		163.5	33.51+/-0.17	161.5	33.88+/-0.17	1.6	thr=140mV, 0.50uA
Average		-	37.12+/-0.14	-	36.94+/-0.14	-	Av: 37.02+/-0.14
8996-8996		163.5	-	0.50uA	-	-	LED: dtime=2.3%
9004-9005	107.0	90.5	-	0.50uA	-	-	thr=140mV, raster ON, laser DC
9006-9011		23.0	-30.05+/-0.14	20.5	-29.53+/-0.14	1.6	thr=140mV
8998-9003		163.5	-35.18+/-0.14	161.5	-35.57+/-0.14	0.3	thr=140mV, 0.50uA
Average		-	-32.62+/-0.10	-	-32.55+/-0.14	-	Av: 32.58+/-0.10
9015-9020	91.2	23.0	-6.25+/-0.15	20.5	-6.14+/-0.15	6.8	thr=140mV, laser DC
9021-9034		163.5	-12.81+/-0.10	161.5	-13.03+/-0.10	2.0	thr=140mV, 0.50uA
Average		-	-9.53+/-0.11	-	-9.53+/-0.11	-	Av: -9.56+/-0.11
9015-9020		23.0	-4.94+/-0.18	20.5	-4.85+/-0.18	5.2	thr=140mV, laser RF
9021-9034		163.5	-11.77+/-0.17	161.5	-11.97+/-0.17	2.0	thr=140mV, 0.50uA
Average		-	-8.36+/-0.14	-	-8.41+/-0.14	-	Av: -8.38+/-0.14
9058-9063	76.1	22.5	16.68+/-0.15	20.0	16.40+/-0.15	1.8	thr=140mV, laser DC
9053-9056		163.5	8.08+/-0.18	161.5	8.23+/-0.18	5.1	thr=140mV, 0.50uA
Average		-	12.38+/-0.14	-	12.32+/-0.14	-	Av: 12.35+/-0.14
9068-9069	36.1	90.5	-	0.50uA	-	-	thr=140mV, raster ON, laser DC
9064-9067		22.5	64.44+/-0.19	19.7	63.24+/-0.19	1.4	thr=140mV
9070-9075		163.5	57.29+/-0.14	161.3	57.99+/-0.14	3.6	thr=140mV, 0.50uA
Average		-	60.87+/-0.13	-	60.62+/-0.13	-	Av: 60.75+/-0.10
9086-9091	11.5	23.0	76.46+/-0.15	20.5	74.86+/-0.15	1.1	thr=140mV
9080-9085		163.5	72.46+/-0.14	161.5	73.25+/-0.14	1.7	thr=140mV, 0.50uA
Average		-	74.46+/-0.13	-	75.06+/-0.13	-	Av: 74.76+/-0.13
9092-9097	-8.7	23.0	76.92+/-0.15	20.5	75.31+/-0.15	1.1	thr=140mV, laser DC
9098-9103		163.5	75.44+/-0.14	161.5	76.27+/-0.14	1.7	thr=140mV, 0.50uA
Average		-	76.18+/-0.13	-	75.79+/-0.13	-	Av: 75.98+/-0.13
9104-9111	-8.7	23.0	75.40+/-0.13	20.5	74.10+/-0.13	3.8	thr=140mV, laser RF
9112-9119		163.5	73.69+/-0.12	161.5	74.77+/-0.12	1.7	thr=140mV, 0.50uA
Average		-	74.68+/-0.11	-	74.43+/-0.11	-	Av: 74.56+/-0.11
9120-9125	-56.9	23.0	44.07+/-0.15	20.5	43.31+/-0.13	0.9	thr=140mV, laser DC
9126-9131		163.5	48.21+/-0.14	161.5	48.74+/-0.14	0.8	thr=140mV, 0.50uA
Average		-	46.14+/-0.11	-	46.03+/-0.11	-	Av: 46.08+/-0.11
9138-9143	-81.6	23.0	9.03+/-0.17	20.5	8.87+/-0.17	1.5	thr=140mV, laser DC
9132-9137		163.5	17.60+/-0.14	161.5	17.79+/-0.14	21.	thr=140mV, 0.50uA
Average		-	13.31+/-0.13	-	13.33+/-0.13	-	Av: 13.32+/-0.13
9144-9149	-106.0	23.0	-28.28+/-0.16	20.5	-27.79+/-0.17	7.7	thr=140mV, laser DC
9150-9159		163.5	-20.71+/-0.11	161.5	-20.94+/-0.11	8.1	thr=140mV, 0.50uA
Average		-	-24.50+/-0.15	-	-24.36+/-0.15	-	Av: -24.43+/-0.15
9160-9165	-106.0	23.0	0.45+/-0.18	-		5.3	thr=140mV, laser DC, Depolarizer
9150-9159		163.5	0.69+/-0.19	-		2.2	thr=140mV, 0.50uA
Average		-	0.57+/-0.15	-	-	-	-

Spin dance results
Wien ^o Polarization %
Hall A Hall B Hall C Compton Mott
-8.9 75.85+/-0.14 - - -75.35+/-2.8 13.63+/-0.25

55.7 37.02+/-0.14 -33.5+/-0.9 73.80+/-0.28 - -58.05+/-0.30

107.1 -32.52+/-0.14 -71.4+/-0.8 43.91+/-0.25 - -68.00+/-0.30

91.2 -9.56+/-0.14 -64.8+/-0.8 60.16+/-0.21 9.97+/-1.0 -71.70+/-0.30

76.1 12.35+/-0.14 -52.80+/-0.8 70.00+/-0.42 -12.45+/-1.4 -69.60+/-0.30

36.1 60.75+/-0.14 -8.70+/-0.8 67.88+/-0.20 - -

11.5 74.76+/-0.14 24.00+/-0.8 49.76+/-0.40 - -10.50+/-0.40

-8.7 75.98+/-0.14 43.90+/-0.8 28.90+/-0.26 ? 13.73+/-0.43

-38.7 - - - -61.00+/-0.61 47.30+/-0.40

-56.9 46.08+/-0.14 69.50+/-0.8 -30.93+/-0.20 - 62.00+/-0.40

-81.6 13.31+/-0.14 62.00+/-3.0 -58.57+/-0.22 - ?

-106.0 -24.43+/-0.14 ??.00+/- .0 ??. +/-0.22 - ?

Spin dance results
Wien ^o	Polarization %
Hall A	Hall B	Hall C	Compton	Mott
-8.9	75.85+/-0.14	-	-	-75.35+/-2.8	13.63+/-0.25
55.7	37.02+/-0.14	-33.5+/-0.9	73.80+/-0.28	-	-58.05+/-0.30
107.1	-32.52+/-0.14	-71.4+/-0.8	43.91+/-0.25	-	-68.00+/-0.30
91.2	-9.56+/-0.14	-64.8+/-0.8	60.16+/-0.21	9.97+/-1.0	-71.70+/-0.30
76.1	12.35+/-0.14	-52.80+/-0.8	70.00+/-0.42	-12.45+/-1.4	-69.60+/-0.30
36.1	60.75+/-0.14	-8.70+/-0.8	67.88+/-0.20	-	-
11.5	74.76+/-0.14	24.00+/-0.8	49.76+/-0.40	-	-10.50+/-0.40
-8.7	75.98+/-0.14	43.90+/-0.8	28.90+/-0.26	?	13.73+/-0.43
-38.7	-	-	-	-61.00+/-0.61	47.30+/-0.40
-56.9	46.08+/-0.14	69.50+/-0.8	-30.93+/-0.20	-	62.00+/-0.40
-81.6	13.31+/-0.14	62.00+/-3.0	-58.57+/-0.22	-	?
-106.0	-24.43+/-0.14	??.00+/- .0	??. +/-0.22	-	?

The full information is given here .

The point at -81.6^o Wien angle, at 163.5^o target angle has a high chi2 value of 21. Apparently, the value of polarization changed just during the measurement. The first 3 points are at about P=0.19, while the last 3 points are at 0.16. The latter matches the measurement at the forward target angle (23^o) which was done right after the measurement at 163.5.

Comparison of the DC and RF measurements with Hall A Moller.
# Polarization with (DC) % Polarization (RF) % DC-RF, % relative
1 75.98+/-0.13 74.56+/-0.11 1.4+/-0.2

2 75.85+/-0.14 73.44+/-0.10 2.4+/-0.2

Comparison of the DC and RF measurements with Hall A Moller.
#	Polarization with (DC) %	Polarization (RF) %	DC-RF, % relative
1	75.98+/-0.13	74.56+/-0.11	1.4+/-0.2
2	75.85+/-0.14	73.44+/-0.10	2.4+/-0.2

The results for all the measurements, presented on the plot 1 indicate a deviation of the Wien filter angles from the expected ones at large angles. Removing the points at -85< theta_wien< 85 plot 2 does not change the results significantly. Hall A measures two "zero-crossings". Presumably because of the Wien angle distortion the results from the left and right crossings differ considerably - by about 4^o (see plot 3).

The transverse polarization of the beam has been taken into account for the analysis of Hall A Moller data. The longitudinal polarization measured has not been affected by the transverse polarization, since the forward and backward target angles are nearly the same and in such a case the transverse component cancels while the average for two target position is taken (see plot 4). The transverse polarization was evaluated taking a difference of the results at forward and backward target angles (see the same plot). The predicted dependence was fit to these data yielding the full polarization of 70.4+\-1.2 (compare with 76.2+/-0.12 for the longitudinal polarization) and the angle of -5+/-1^o (compare with -3.2+/-0.4^o for the longitudinal polarization), more or less consistent with the longitudinal polarization.

The final result for Hall A Moller: 76.90 +/- 0.13(stat) +/- 2.4(syst-prelim)

Spin angles, assumed linac energy of 0.5590GeV. The polarization for Hall A and C was evaluated in a Wien angle range of +/-85^o. For Hall A Moller a correction for dead time of +1% was done. Hall A Compton result was projected to the DC mode using a correction factor of +1.9% obtained with Hall A Moller polarimeter. The errors shown are statistical.
Polarimeter Predicted angle ^o Measured angle ^o chi2/ndf shift ^o D(E)/E linac Polarization %
Mott 0. 1.9+/-0.4 1.7 +1.9+/-0.3 - 71.64+/-0.21

Compton A -7.77 -4.7+/-0.6 2.3 +3.1+/-0.6 0.00029 73.12+/-0.45

Moller A -7.77 -3.2+/-0.3 8.7 +4.6+/-0.3 0.00042 76.94+/-0.13

Moller B -66.70 -61.2+/-0.5 2.4 +5.5+/-0.3 0.00049 71.70+/-0.48

Moller C 54.37 57.8+/-0.4 4.7 +3.4+/-0.3 0.00034 73.84+/-0.23

Spin angles, assumed linac energy of 0.5590GeV. The polarization for Hall A and C was evaluated in a Wien angle range of +/-85^o. For Hall A Moller a correction for dead time of +1% was done. Hall A Compton result was projected to the DC mode using a correction factor of +1.9% obtained with Hall A Moller polarimeter. The errors shown are statistical.
Polarimeter	Predicted angle ^o	Measured angle ^o	chi2/ndf	shift ^o	D(E)/E linac	Polarization %
Mott	0.	1.9+/-0.4	1.7	+1.9+/-0.3	-	71.64+/-0.21
Compton A	-7.77	-4.7+/-0.6	2.3	+3.1+/-0.6	0.00029	73.12+/-0.45
Moller A	-7.77	-3.2+/-0.3	8.7	+4.6+/-0.3	0.00042	76.94+/-0.13
Moller B	-66.70	-61.2+/-0.5	2.4	+5.5+/-0.3	0.00049	71.70+/-0.48
Moller C	54.37	57.8+/-0.4	4.7	+3.4+/-0.3	0.00034	73.84+/-0.23

Final results

Fitting the curves with just the statistical errors for the polarization measurements gives a high chi2, about 200 per degree of freedom. We assume that either there is a considerable error on the Wien filter angle, or the polarimeters (Hall A Moller in particular) has a systematic error showing up at large transverse polarizations of the beam. In both cases the amplitude of the SIN curve is not affected by this error, though the phase might be affected. We used the former assumption and attributed and error of 1^o to all the angles. The fit was done in two steps. At the first step, the error on the angle was ignored, while on the second step this error was translated to the polarization error, using the already known slope of the curve, and added in quadratures. The results of the fit for all the polarimeters, shown on plot 5, are different by 1-2% from the initial fit.

Spin angles, assumed linac energy of 0.5590GeV. The final results from the polarimeters as well as the Wien filter angles are used. The Wien angle is assumed to have a random error of 1.0^o. For Hall A Moller, corrections for the dead time of +1% and for the Levchuk effect of -0.4% were done. Hall A Compton result was projected to the DC mode using a correction factor of +1.9% obtained with Hall A Moller polarimeter. The errors shown are statistical. For Hall A, the average for two methods to measure the target angles (the dial angle and the measured angle) was used.
Polarimeter	Predicted angle ^o	no Wien errors			Wien error of 1^o
Polarimeter	Predicted angle ^o	angle ^o	Polarization %	chi2/ndf	angle ^o	Polarization %	chi2/ndf
Mott	0.	1.2±0.20	72.21±0.11	4.2	1.1±0.4	72.43±0.15	0.9
Compton	-7.77	-4.2±0.30	72.67±0.43	4.7	-4.6±0.6	72.40±0.52	3.4
Moller A	-7.77	-3.9±0.04	77.07±0.07	230.0	-3.7±0.3	75.21±0.14	3.4
Moller B	-66.70	-60.4±0.40	69.71±0.47	1.8	-60.4±0.6	69.80±0.55	1.2
Moller C	54.37	57.0±0.10	73.24±0.08	42.4	57.5±0.4	73.60±0.14	4.0

Comparison of all polarimeters for the fit with the Wien errors of 1^o is shown on plot 6.

14 July 2000 8:40-9:00.

The beam energy is 4.535 GeV (MCC) or ?? (EP), one linac is N=0.5590 S=0.5590, inj=0.06289. The injector angle is 68.8^o, the 1/2 wave plate was OUT.

The laser phase was at 6.2^o.

Supermendur target P=7.76%. Target Angles and Beam Polarizations. The theta acceptance is about +/-15^o? and the mean analysing power is 0.76?. The error is statistical only.
runs	Dial angle	Calculated angle	chi2	comments
angle	Polarization %	angle	Polarization %
9179-9180	90.5	0.55uA	-	-	-	thr=140mV, raster ON , atten=600
9173-9178	23.0	77.34+/-0.14	20.5	76.00+/-0.14	2.9	thr=140mV
9181-9186	163.5	74.65+/-0.14	161.2	75.61+/-0.14	3.3	thr=140mV
Average	-	76.00+/-0.10	-	75.61+/-0.10	-	Av: 75.90+/-0.10

The full information is given here .

The final result: 75.90 +/- 0.10(stat) +/- 2.4(syst-prelim) (1/2 wave plate OUT, 68.8^o Wien angle)

17 July 2000 17:00-18:00.

The beam energy is 4.535 GeV (MCC) or ?? (EP), one linac is N=0.5590 S=0.5590, inj=0.06289. The injector angle is 68.8^o, the 1/2 wave plate was OUT.

The laser phase was at 6.2^o.

Supermendur target P=7.76%. Target Angles and Beam Polarizations. The theta acceptance is about +/-15^o? and the mean analysing power is 0.76?. The error is statistical only.
runs	Dial angle	Calculated angle	chi2	comments
angle	Polarization %	angle	Polarization %
9197-9198	90.5	0.55uA	-	-	-	thr=140mV, raster ON , atten=600
9190-9195	23.0	-71.03+/-0.15	19.8	-69.49+/-0.15	0.5	thr=140mV
9199-9207	163.5	-69.18+/-0.15	160.8	-68.35+/-0.15	0.1	thr=140mV
Average	-	-69.18+/-0.11	-	-68.92+/-0.11	-	Av: -69.05+/-0.11

The full information is given here .

The final result: -69.05 +/- 0.11(stat) +/- 2.4(syst-prelim) (1/2 wave plate OUT, 68.8^o Wien angle)

05 October 2000 10:00-13:00.

The beam energy is 4.600 GeV (Acc) or 4.607 (Arun), one linac is N=0.5670 S=0.5670, inj=0.06379 (MCC). Injector angle is -24.7^o, the 1/2 wave plate was OUT.

The laser phase was at ?^o (not read out).

Supermendur target P=7.95%. Target Angles and Beam Polarizations. The theta acceptance is about +/-15^o? and the mean analysing power is 0.76. The error is statistical only.
runs Dial angle Calculated angle chi2 comments
angle Polarization % angle Polarization %

9248-9249 90.5 0.50uA - - - thr=140mV, raster ON atten 180

9242-9247 23.0 -62.57+/-0.18 22.8 -62.50+/-0.15 1.1 thr=140mV

9250-9255 163.5 -58.00+/-0.17 160.9 -58.70+/-0.17 0.9 thr=140mV

Average - -60.27+/-0.15 - -60.60+/-0.15 - Av: -60.45+/-0.15

9256-9259 158.0 -57.80+/-0.23 156.5 -58.40+/-0.23 0.5 thr=140mV

9260-9263 153.0 -56.53+/-0.23 150.0 -58.16+/-0.26 1.0 thr=140mV

9264-9265 91.0 - - - - thr=140mV

9266-9267 41.0 -66.60+/-0.50 40.9 -66.60+/-0.50 3.0 thr=140mV

9268-9271 32.0 -64.50+/-0.30 31.8 -64.36+/-0.30 1.2 thr=140mV

9272-9275 23.0 -61.94+/-0.23 22.5 -61.71+/-0.23 4.1 thr=140mV

Supermendur target P=7.95%. Target Angles and Beam Polarizations. The theta acceptance is about +/-15^o? and the mean analysing power is 0.76. The error is statistical only.
runs	Dial angle	Calculated angle	chi2	comments
angle	Polarization %	angle	Polarization %
9248-9249	90.5	0.50uA	-	-	-	thr=140mV, raster ON atten 180
9242-9247	23.0	-62.57+/-0.18	22.8	-62.50+/-0.15	1.1	thr=140mV
9250-9255	163.5	-58.00+/-0.17	160.9	-58.70+/-0.17	0.9	thr=140mV
Average	-	-60.27+/-0.15	-	-60.60+/-0.15	-	Av: -60.45+/-0.15
9256-9259	158.0	-57.80+/-0.23	156.5	-58.40+/-0.23	0.5	thr=140mV
9260-9263	153.0	-56.53+/-0.23	150.0	-58.16+/-0.26	1.0	thr=140mV
9264-9265	91.0	-	-	-	-	thr=140mV
9266-9267	41.0	-66.60+/-0.50	40.9	-66.60+/-0.50	3.0	thr=140mV
9268-9271	32.0	-64.50+/-0.30	31.8	-64.36+/-0.30	1.2	thr=140mV
9272-9275	23.0	-61.94+/-0.23	22.5	-61.71+/-0.23	4.1	thr=140mV

The LED did not work. We do not know the reason. They should be checked during the next maintenance. We assumed a correction of +1.5% at the target angle of 20^o.

The full information is given here .

The influence of the transverse

The final result: -61.35 +/- 0.15(stat) +/- 2.4(syst-prelim) (1/2 wave plate OUT, -24.7^o Wien angle)
The result was obtained by averaging the points at about +/-20^o. The influence of the transverse polarization is presented on a plot. The fit parameters for the top 2 plots were:

Z-projection of the beam polarization P_Z and the spin angle in the Moller reference frame (looking down - counterclockwise is the positive direction);
Total beam polarization P_TOT and the spin angle as before.

The third plot presents the predicted dependence of P_Z on the Wien filter angle for the beam energy 4.607GeV.

15 November 2000 14:40-16:10.

The beam energy is 4.607 (Arun), one linac is N=0.56789 S=0.56789, inj=0.06389 (MCC). Injector angle is -33.0^o, the 1/2 wave plate was IN.

The laser phase was at ?^o (not read out).

Mott: 69.17+/-1.56(stat)+/-0.45(sys) (see ELOG)

Supermendur target P=7.95%. Target Angles and Beam Polarizations. The theta acceptance is about +/-15^o? and the mean analysing power is 0.76. The error is statistical only.
runs	Dial angle	Calculated angle	chi2	comments
angle	Polarization %	angle	Polarization %
9291-9292	90.5	0.60uA	-	-	-	thr=140mV, raster ON , atten=250
9283-9286	23.5	69.75+/-0.20	22.3	69.40+/-0.20	1.0	thr=140mV
9293-9296	163.5	66.67+/-0.20	162.9	66.88+/-0.20	3.0	thr=140mV
Average	-	68.21+/-0.15	-	68.14+/-0.15	-	Av: 68.18+/-0.15
9287-9290	38.5	72.57+/-0.30	37.5	71.59+/-0.30	5.3	thr=140mV
9297-9300	147.0	65.89+/-0.27	146.5	66.27+/-0.27	1.6	thr=140mV

The LED did not work. We do not know the reason. They should be checked during the next maintenance. We assumed a correction of +1.5% at the target angle of 20^o.

The full information is given here .

The final result: Pz=69.14 +/- 0.12(stat) +/- 2.4(syst-prelim) (1/2 wave plate IN, -33.0^o Wien angle)
The result was obtained by fitting the expected curve to the points at all target angles, taking the transverse polarization into account, see the plot. The spin angle fit is -19.6+/-1.2^o. The full polarization is 73.4 +/- 0.55(stat)%.

17 November 2000 13:00-14:50.

The beam energy is 4.607 (Arun), one linac is N=0.56789 S=0.56789, inj=0.06389 (MCC). Injector angle is -33.0^o, the 1/2 wave plate was OUT.

The laser phase was at ?^o (not read out).

Mott: 79.91+/-0.66(stat)+/-0.48(sys) (see ELOG)

Supermendur target P=7.95%. Target Angles and Beam Polarizations. The theta acceptance is about +/-15^o? and the mean analysing power is 0.76. The error is statistical only.
runs	Dial angle	Calculated angle	chi2	comments
angle	Polarization %	angle	Polarization %
9308-9309	90.5	0.48uA	-	-	-	thr=140mV, raster ON , atten=240
9304-9307	23.5	-68.57+/-0.21	22.5	-68.32+/-0.21	2.4	thr=140mV
9311-9314	163.5	-65.45+/-0.17	162.9	-65.87+/-0.17	1.4	thr=140mV
9315-9318	147.0	-65.03+/-0.26	146.9	-65.10+/-0.26	1.1	thr=140mV
9319-9322	39.0	-70.54+/-0.30	38.8	-70.34+/-0.30	0.5	thr=140mV

The LED did not work. We do not know the reason. They should be checked during the next maintenance. We assumed a correction of +1.2% at the target angle of 20^o.

The full information is given here .

The final result: Pz=-67.82 +/- 0.11(stat) +/- 2.4(syst-prelim) (1/2 wave plate OUT, -33.0^o Wien angle)
The result was obtained by fitting the expected curve to the points at all target angles, taking the transverse polarization into account, see the plot. The spin angle fit is -19.4+/-1.2^o. The full polarization is 71.92 +/- 0.50(stat)%.

01 December 2000 13:30-18:30.

The beam energy is 4.5885 (Ep), one linac is 0.5656(Ep), N/S=0.565, inj=0.06356 (MCC). Injector angle is -7.0^o, the 1/2 wave plate was OUT.

The laser phase was at ?^o (not read out).

The helicity convention has been flipped with respect to the previous period. Now, the beam polarization is defined for the logical unit of the helicity signal.

Supermendur target P=7.95%. Target Angles and Beam Polarizations. The theta acceptance is about +/-15^o? and the mean analysing power is 0.76. The error is statistical only.
runs Dial angle Calculated angle chi2 comments
angle Polarization % angle Polarization %

9364-9365 90.5 0.55uA - - - thr=140mV, raster ON , atten=200

9359-9362 23.0 68.51+/-0.22 - 0.4 thr=140mV Wien -36.16

9366-9369 163.5 69.87+/-0.19 - 0.1 thr=140mV

9374-9375 90.5 0.57uA - - - thr=140mV,Wien +24.7

9370-9373 23.0 56.88+/-0.21 22.0 56.47+/-0.21 2.4 thr=140mV

9378-9381 163.5 50.51+/-0.17 162.9 50.67+/-0.17 0.4 thr=140mV

9388-9389 90.5 0.43uA - - - thr=140mV,Wien -7.0

9384-9387 23.0 72.34+/-0.22 22.5 72.09+/-0.22 0.2 thr=140mV

9390-9395 163.5 70.83+/-0.16 163.2 71.51+/-0.16 1.0 thr=140mV

9396 163.5 0.42uA thr=140mV LED 1.67% dt

9397 163.5 0.59uA thr=140mV LED 2.27% dt

Supermendur target P=7.95%. Target Angles and Beam Polarizations. The theta acceptance is about +/-15^o? and the mean analysing power is 0.76. The error is statistical only.
runs	Dial angle	Calculated angle	chi2	comments
angle	Polarization %	angle	Polarization %
9364-9365	90.5	0.55uA	-	-	-	thr=140mV, raster ON , atten=200
9359-9362	23.0	68.51+/-0.22	-		0.4	thr=140mV Wien -36.16
9366-9369	163.5	69.87+/-0.19	-		0.1	thr=140mV
9374-9375	90.5	0.57uA	-	-	-	thr=140mV,Wien +24.7
9370-9373	23.0	56.88+/-0.21	22.0	56.47+/-0.21	2.4	thr=140mV
9378-9381	163.5	50.51+/-0.17	162.9	50.67+/-0.17	0.4	thr=140mV
9388-9389	90.5	0.43uA	-	-	-	thr=140mV,Wien -7.0
9384-9387	23.0	72.34+/-0.22	22.5	72.09+/-0.22	0.2	thr=140mV
9390-9395	163.5	70.83+/-0.16	163.2	71.51+/-0.16	1.0	thr=140mV
9396	163.5	0.42uA				thr=140mV LED 1.67% dt
9397	163.5	0.59uA				thr=140mV LED 2.27% dt

The full information is given here .

The final result: Pz=72.2 +/- 0.15(stat) +/- 2.4(syst-prelim) (1/2 wave plate OUT, -7.0^o Wien angle) (dead time correction of 1% included)
The spin-dance results are presented on the plot. The optimal Wien angle is -17.8^o. The spin angle to the Z axis was calculated using two ways:

as a difference of the Wien angle and the found optimal angle,
reconstructed from the influence of the transverse polarization, using the measurements at different target angles (23 and 163^o in this case).

The difference between the results of these two methods is presented on the same plot. The maximum difference of about 1.4^o is indicating that the accuracy of the second method is reasonably good to make estimates of the spin angle while evaluating the accelerator tune.

Comparison of the measured optimal angles in each hall with calculations for Elinac=0.5656:

                         Wien angle for max Pz, deg
     Hall                measured       calculated     dE/d(thet)/E0 1/deg  
     A                 -17.8+/-0.5          -21.5        0.00014
     B                  -4.9+/-1.6          -10.7        0.00010
     C                  -6.2+/-0.5           -6.3        0.00080

These results indicate a linac energy of 0.5653 and E(A)=4.586 GeV.

13 December 2000 21:30-00:20.

The beam energy is 4.5885 (Ep), one linac is 0.5656(Ep), N/S=0.565, inj=0.06356 (MCC). Injector angle is -7.0^o, the 1/2 wave plate was OUT.

The laser phase was at ?^o (not read out).

Supermendur target P=7.95%. Target Angles and Beam Polarizations. The theta acceptance is about +/-15^o? and the mean analysing power is 0.76. The error is statistical only.
runs Dial angle Calculated angle chi2 comments
angle Polarization % angle Polarization %

9420-9421 90.5 - 0.48uA - - thr=140mV, raster ON , atten=200

9403-9408 23.0 66.35+/-0.20 23.0 66.35+/-0.20 0.9 thr=140mV Wien -7.0deg

9422-9425 163.5 63.78+/-0.20 162.2 64.23+/-0.20 1.9 thr=140mV

Average - 65.07+/-0.15 - 65.29+/-0.15 - Av: 65.18+/-0.15

9427 163.5 - 0.48uA - - thr=140mV LED 1.8% dt

9436 163.5 - 0.17uA - - thr=140mV LED 0.7% dt

9434-9435 163.5 57.60+/-0.50 0.17uA - - thr=140mV

9437 163.5 - 0.79uA - - thr=140mV LED 3.0% dt

9438-9439 163.5 63.90+/-0.30 0.79uA - - thr=140mV

9444 163.5 - 1.50uA - - thr=140mV LED 5.5% dt

9441-9442 163.5 63.66+/-0.22 1.50uA - - thr=140mV

9413-9418 23.0 -64.10+/-1.20 - - 1.9 Hall A laser OFF

Supermendur target P=7.95%. Target Angles and Beam Polarizations. The theta acceptance is about +/-15^o? and the mean analysing power is 0.76. The error is statistical only.
runs	Dial angle	Calculated angle	chi2	comments
angle	Polarization %	angle	Polarization %
9420-9421	90.5	-	0.48uA	-	-	thr=140mV, raster ON , atten=200
9403-9408	23.0	66.35+/-0.20	23.0	66.35+/-0.20	0.9	thr=140mV Wien -7.0deg
9422-9425	163.5	63.78+/-0.20	162.2	64.23+/-0.20	1.9	thr=140mV
Average	-	65.07+/-0.15	-	65.29+/-0.15	-	Av: 65.18+/-0.15
9427	163.5	-	0.48uA	-	-	thr=140mV LED 1.8% dt
9436	163.5	-	0.17uA	-	-	thr=140mV LED 0.7% dt
9434-9435	163.5	57.60+/-0.50	0.17uA	-	-	thr=140mV
9437	163.5	-	0.79uA	-	-	thr=140mV LED 3.0% dt
9438-9439	163.5	63.90+/-0.30	0.79uA	-	-	thr=140mV
9444	163.5	-	1.50uA	-	-	thr=140mV LED 5.5% dt
9441-9442	163.5	63.66+/-0.22	1.50uA	-	-	thr=140mV
9413-9418	23.0	-64.10+/-1.20	-	-	1.9	Hall A laser OFF

The full information is given here .

The leakage from Halls B,C was measured in runs 9409-9418 (9411 was a mistake), by turning the A laser off. The beam polarization from B,C is about the same as in A, but with the opposite sign. The coincidence rate corresponds to about 2.2% of 500nA, which is about 10nA. The dilution for Moller measurements is therefore about 4.4%.

The final result: Pz=68.7 +/- 0.15(stat) +/- 2.4(syst-prelim) +/- 0.3 (leakage correction)(1/2 wave plate OUT, -7.0^o Wien angle) (dead time correction of 0.9% and 4.4% for the B,C leakage included)

18 December 2000 15:20-17:30.

The beam energy is 4.5885 (Ep), one linac is 0.5656(Ep), N/S=0.565, inj=0.06356 (MCC). Injector angle is -7.0^o, the 1/2 wave plate was OUT.

The laser phase was at ?^o (not read out).

Supermendur target P=7.95%. Target Angles and Beam Polarizations. The theta acceptance is about +/-15^o? and the mean analysing power is 0.76. The error is statistical only.
runs Dial angle Calculated angle chi2 comments
angle Polarization % angle Polarization %

9453-9454 90.5 - 0.55uA - - thr=140mV, raster ON , atten=360

9449-9452 22.5 67.95+/-0.18 22.2 67.81+/-0.18 0.1 Lasers A,B,C on

9464-9467 23.0 72.03+/-0.19 22.5 71.77+/-0.19 0.2 Laser C off

9457-9460 163.5 69.77+/-0.16 162.2 70.26+/-0.16 1.4 Laser C off

9468-9471 23.0 68.98+/-0.19 - - 2.5 Lasers A,B,C on

9472-9475 23.0 -74.08+/-1.0 - - 5.0 Laser A off, B,C on Rate equivalent = 0.2nA

9462-9463 163.0 - - - - Lasers A,C off, B on, Rate equivalent = 15nA

9461 163.5 - 0.56uA - - thr=140mV LED 2.2% dt - 1.7% for 23.^o

Average - 71.60+/-0.15 - 71.71+/-0.15 - Av: 71.65+/-0.15 Dead time included

Supermendur target P=7.95%. Target Angles and Beam Polarizations. The theta acceptance is about +/-15^o? and the mean analysing power is 0.76. The error is statistical only.
runs	Dial angle	Calculated angle	chi2	comments
angle	Polarization %	angle	Polarization %
9453-9454	90.5	-	0.55uA	-	-	thr=140mV, raster ON , atten=360
9449-9452	22.5	67.95+/-0.18	22.2	67.81+/-0.18	0.1	Lasers A,B,C on
9464-9467	23.0	72.03+/-0.19	22.5	71.77+/-0.19	0.2	Laser C off
9457-9460	163.5	69.77+/-0.16	162.2	70.26+/-0.16	1.4	Laser C off
9468-9471	23.0	68.98+/-0.19	-	-	2.5	Lasers A,B,C on
9472-9475	23.0	-74.08+/-1.0	-	-	5.0	Laser A off, B,C on Rate equivalent = 0.2nA
9462-9463	163.0	-	-	-	-	Lasers A,C off, B on, Rate equivalent = 15nA
9461	163.5	-	0.56uA	-	-	thr=140mV LED 2.2% dt - 1.7% for 23.^o
Average	-	71.60+/-0.15	-	71.71+/-0.15	-	Av: 71.65+/-0.15 Dead time included

The full information is given here .

The leakage from Hall B was measured and occurs negligible: 0.0004 of 0.5uA (comparison of runs 9462-9463 with 9460). The leakage from Hall C is measured: 2.8% (comparison of runs 9472-9475 with 9468-9471). The polarization change, caused by this leakage is (comparison of runs 9449-9452 with 9464-9467) 5.7+/-0.4%, close to the expected value of 2*2.8%=5.6%: 4.3% (comparison of runs 9464-9467 with 9468-9471). The correction factor needed to compensate for the leakage is 1.06+/-0.004.

The final result: Pz=71.65 +/- 0.15(stat) +/- 2.4(syst-prelim) (1/2 wave plate OUT, -7.0^o Wien angle) (dead time correction of 1.1% and 0.9% for 2 target angles, the data with no leakage were used)