The beam energy is 3.033 (acc). Injector angle is 15.945^o, the 1/2 wave plate was OUT.

The collimator width was at max (4cm), thr=250mV, raster OFF.

Mott: P=(80.74 +/- 1.02(stat) +/- 0.97(sys)) % (see ELOG)

Supermendur target P=7.95% (old). 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	laser			comments
	angle	Polarization %	angle	Polarization %		A, µA	C, µC	A slit
11169-11170	90.0	-	-	-	-	0.30	0.	14.1
11165-11168	23.0	89.0+/-0.2	18.6	86.4+/-0.2	2.7	0.30	0.	14.1
11171-11174	163.0	83.5+/-0.2	159.4	85.3+/-0.2	0.9	0.2	0.	14.1
Average	-	86.2+/-0.1	-	85.8+/-0.1	-	0.25	0.	14.1	Av: 86.0+/-0.1 Dead time not included

The final result:

Pz= +86.0 +/- 0.1(stat) +/- 3.0(syst-prelim) (1/2 wave plate OUT, 15.9^o Wien angle) (dead time, leakage corrections NOT DONE)

The full information is given here . The plot is given here .

The beam energy is 3.033 (acc). Injector angle is 15.945^o, the 1/2 wave plate was IN.

The collimator width was at max (4cm), thr=250mV, raster ON.

Mott: P=(80.74 +/- 1.02(stat) +/- 0.97(sys)) % (see ELOG)

Supermendur target P=7.95% (old). 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	laser			comments
	angle	Polarization %	angle	Polarization %		A, µA	C, µC	A slit
11188-11189	90.0	-	-	-	-	0.35	0.	14.6
11184-11187	23.0	-88.6+/-0.2	19.2	-86.4+/-0.2	1.0	0.35	0.	14.6
11190-11193	163.0	-83.3+/-0.2	159.3	-85.2+/-0.2	0.2	0.35	0.	14.6
Average	-	-86.0+/-0.1	-	-85.8+/-0.1	-	0.35	0.	14.6	Av: -85.9+/-0.1 Dead time not included
11194	163.0	-	-	-	-	0.00	0.	14.6	Leak through measurement (0.03%)

The final result:

Pz= -85.9 +/- 0.1(stat) +/- 3.0(syst-prelim) (1/2 wave plate IN, 15.9^o Wien angle) (dead time, leakage corrections NOT DONE)

The full information is given here . The plot is given here .

The beam energy is 3.029 (acc). Injector angle is 91.065^o, the 1/2 wave plate was IN. The spin in the machine is turned vertical!

The collimator width was at max (4cm), thr=250mV, raster ON.

                        -------
        beam -->        |  
                   ------       
      

Supermendur "TOP" target P=7.95% (?). The rotary angle of the target is 90^o. The foil angle to the vertical line is about 12^o. The theta acceptance is about +/-15^o? and the mean analysing power is 0.76/7=0.1085. The error is statistical only.

runs	Helm. coil.>0			Helm. coil.<0			Sum		comments
	I(A)	Polarization %	chi2/ndf	I(A)	Polarization %	chi2/ndf	Polarization %	chi2/ndf
11222-11227	9.1	-18.5+/-1.7	1.4	-9.6	31.3+/-1.8	0.75	24.8+/-1.3	6.	0.34µA , plots
11228-11231	5.4	-21.5+/-2.2	-	-6.0	31.7+/-2.2	-	26.6+/-1.6	4.	0.34µA , plots
11232-11235	0.4	-14.5+/-2.2	-	-1.0	34.1+/-2.2	-	24.3+/-1.5	14.	0.34µA , plots
11238-11241	0.1	-13.0+/-2.2	-	-0.7	28.7+/-2.2	-	20.9+/-1.6	11.	0.34µA , plots
11242-11243	0.0	-14.4+/-3.0	-	-0.0	25.3+/-3.0	-	19.9+/-2.0	-	0.34µA , residual magnetization
11244-11245	9.1	-	-	-	-	-	-	-	0.µA, Hall C - 55µA, lakeage = 0.5%

When the Helmholtz coil flips is sign, it first goes to the highest possible current at the given polarity. The measurement at I=0(A) indicates that a considerable residual magnetization exists in the foil, not overcome by this procedure. This indicates that the maximum magnetic field does not saturate the foil. We can not make any conclusion on the absolute foil polarization.

The sign of the vertical beam polarization can be derived taking into account that the analyzing power for 90^o scattering in CM, happening in XZ plane, is: A_ZZ=-7/9, A_XX=-1/9, A_YY=+1/9. At positive coil currents the target electron spins are polarized along the beam, while in the zig-zagged foil they are looking up. Since the measured asymmetry is negative, we conclude that during the period when the helicity signal is at logical 1, the beam spins are pointed down. This result is preliminary - we need an access to the hall to make sure that the foil is indeed bent the way we think.

Supermendur target P=7.95% (old). 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	laser			comments
	angle	Polarization %	angle	Polarization %		A, µA	C, µC	A slit
11250-11251	90.0	-	-	-	-	0.34	55.	15.0
11246-11249	23.0	2.5+/-0.2	18.7	2.4+/-0.2	2.4	0.34	55.	15.0
11252-11255	163.0	2.1+/-0.2	159.1	2.2+/-0.2	0.7	0.34	55.	15.0
Average	-	2.3+/-0.1	-	2.3+/-0.1	-	0.34	55.	15.0	Av longitudinal: 2.3+/-0.1
Average	-	-	-	1.3+/-3.1	-	0.34	55.	15.0	Av X-component
11260-11263	41.0	1.9+/-0.3	37.6	1.8+/-0.3	0.1	0.34	55.	15.0
11256-11259	145.0	1.8+/-0.3	142.0	1.9+/-0.3	0.6	0.34	55.	15.0
Average	-	1.8+/-0.2	-	1.8+/-0.2	-	0.34	55.	15.0	Av longitudinal: 1.8+/-0.2
Average	-	-	-	0.5+/-1.3	-	0.34	55.	15.0	Av X-component
11264-11265	41.0	-	-	-	-	0.00	55.	15.0	Leak through measurement (0.5%)

The plots are given here and there .

The full information is given here . The final result:

Pz= +2.0 +/- 0.1(stat) +/- 0.1(syst-prelim)% (1/2 wave plate IN, 90.^o Wien angle) (dead time, leakage corrections NOT DONE)

Px= 0.5 +/- 1.3(stat)%

The beam energy is 3.028 (acc). Injector angle is 15.945^o, the 1/2 wave plate was IN.

The collimator width was at max (4cm), thr=250mV, raster ON.

Supermendur target P=7.95% (old). 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	laser			comments
	angle	Polarization %	angle	Polarization %		A, µA	C, µC	A slit
11271-11272	90.0	-	-	-	-	0.34	40.	14.0
11267-11270	23.0	-78.4+/-0.2	19.2	-76.4+/-0.2	3.0	0.35	40.	14.0
11274-11277	163.0	-73.9+/-0.2	159.5	-75.5+/-0.2	0.6	0.35	40.	14.0
Average	-	-76.2+/-0.1	-	-75.9+/-0.1	-	0.35	40.	14.6	Av: -76.0+/-0.1 Dead time not included
11278-11279	163.0	+38.0+/-5.0	-	-	-	0.00	40.	14.6	Leak through measurement (0.3%)

The final result:

Pz= -76.0 +/- 0.1(stat) +/- 3.0(syst-prelim) (1/2 wave plate IN, 15.9^o Wien angle) (dead time, leakage corrections NOT DONE)
-76.3 - with the leak-through correction

The full information is given here . The plot is given here .

The beam energy is 3.028 (acc). Injector angle is 15.945^o, the 1/2 wave plate was OUT.

The collimator width was at max (4cm), thr=250mV, raster ON.

Supermendur target P=7.95% (old). 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	laser			comments
	angle	Polarization %	angle	Polarization %		A, µA	C, µC	A slit
11305-11306	90.0	-	-	-	-	0.33	55.	14.15
11301-11304	23.0	78.1+/-0.2	19.2	76.2+/-0.2	0.6	0.33	55.	14.15
11307-11310	163.0	73.7+/-0.2	159.3	75.3+/-0.2	0.3	0.33	55.	14.15
Average	-	75.9+/-0.1	-	75.8+/-0.1	-	0.33	55.	14.15	Av: 75.8+/-0.1 Dead time not included
11315-11318	163.0	-35.4+/-3.0	-	-	-	0.00	40.	14.15	Leak through measurement (0.5%)
11319-11320	163.0	74.2+/-0.3	-	-	-	0.33	40.	14.15
11323	163.0	-	-	-	-	0.33	40.	14.15	LED thr=150mV: dead time=1.20%
11325-11328	163.0	74.0+/-0.2	-	-	0.4	0.15	40.	14.15
11324	163.0	-	-	-	-	0.15	40.	14.15	LED thr=150mV: dead time=1.01%
11329-11332	163.0	73.1+/-0.1	-	-	1.5	0.59	40.	14.15
11333	163.0	-	-	-	-	0.59	40.	14.15	LED thr=150mV tau=32: dead time=4.20%
11334	163.0	-	-	-	-	0.59	40.	14.15	LED thr=250mV tau=32: dead time=5.06%
11335	163.0	-	-	-	-	0.59	40.	14.15	LED thr=250mV tau=15: dead time=90% - no coincidence!
11336	163.0	-	-	-	-	0.59	40.	14.15	LED thr=250mV tau=8: dead time=100% - no coincidence!
11337	163.0	-	-	-	-	0.59	40.	14.15	LED thr=250mV tau=60: dead time=4.23%
11338	163.0	-	-	-	-	0.59	40.	14.15	LED thr=250mV tau=32: dead time=5.14%
11339	163.0	-	-	-	-	0.59	40.	14.15	LED thr=250mV tau=45: dead time=4.89%
11340	163.0	-	-	-	-	0.59	40.	14.15	LED thr=250mV tau=60: dead time=4.24%
11348-11351	163.0	71.70+/-0.15	-	-	1.1	1.20	40.	14.15	tau=32 (as usual)
11342	163.0	-	-	-	-	1.20	40.	14.15	LED thr=250mV tau=32: dead time=9.58%

The final result:

Pz= +75.8 +/- 0.1(stat) +/- 3.0(syst-prelim) (1/2 wave plate OUT, 15.9^o Wien angle) (dead time, leakage corrections NOT DONE)
+76.3 - with the leak-through correction

The full information is given here . The plot is given here .

The current dependence on the laser phase:

The beam current dependence on the lase phase. The default phase was -107.

phase	-87	-90	-97	-103	-107	-113	-118	-124	-129
current (µA)	0.113	0.232	0.264	0.279	0.301	0.301	0.300	0.283	0.116

The beam energy is 5.766 (acc). Injector angle is -51.2^o, the 1/2 wave plate was OUT.

The collimator width was at max (4cm), thr=250mV, raster ON.

Supermendur target P=7.95% (old). 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	laser			comments
	angle	Polarization %	angle	Polarization %		A, µA	C, µC	A slit
11392-11393	90.0	-	-	-	-	0.34	79.	15.10
11388-11391	23.0	-76.8+/-0.2	21.8	-76.6+/-0.2	4.6	0.34	79.	15.10
11394-11397	163.0	-76.6+/-0.2	160.1	-77.9+/-0.2	4.5	0.34	79.	15.10
Average	-	-76.7+/-0.1	-	-76.9+/-0.1	-	0.34	79.	15.10	Av: -76.8+/-0.1 Dead time not included
11398	23.0	62.5+/-4.0	-	-	-	0.00	79.	15.10	Leak through measurement (1.0%)
11399	23.0	7.2+/-4.0	-	-	-	0.00	79.	15.10	Leak through measurement (1.0%)

The final result:

Pz= -76.8 +/- 0.1(stat) +/- 3.0(syst-prelim) (1/2 wave plate OUT, 15.1^o Wien angle) (dead time, leakage corrections NOT DONE)
-77.5?- with the leak-through correction

The full information is given here . The plot is given here .

New target holder (see The beam energy is 3.661 (acc). Injector angle is -35.0^o, the 1/2 wave plate was OUT(?). This provided near longitudinal polarization in the hall. The beam polarization was supposed to be about 40% (bulk photo-extraction).

The collimator width was at max (4cm), thr=250mV, raster ON.

The full information is given here .