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User name G.M. Urciuoli
Log entry time 16:05:21 on July26,2003
Entry number 107074
keyword=7/28/03 day shift report
7/28/03
day shift
Shift crew
SL: G.M. Urciuoli
TO: E. Keister
3rd: R. Subedi
8:25 run 2823 performed to check the raster size. It is o.k.
8:30 Harp scan performed:
Scanner 5
Absolute Beam h position -678
Absolute Beam v position -65
Horizontal sigma 146 Vertical sigma 80.
Scanner 6
Absolute Beam h position -524 um
Absolute Beam v position 217 um
Horizontal sigma 227 Vertical sigma 75.5
Beam 2 uA
Time Run N. Target momentum Raster Ps1 Ps2 N. of Events
9:00 2824 JUNK
9:00 2825 multifoils 3.065 ON 5 5 2.1 M
Beam 2.3 uA
9:48 2826 multifoils 2.976 ON 5 5 2.2 M
10:24 NMR measurement
10:43 2827 multifoils 3.160 ON 5 5 2.2 M
11:00 Controlled access to install the collimator in
11:27 Hall A in "Beam Permit" status
Time Run N. Target momentum raster ps1 ps2 N. of events
11:45 2827 multifoils 3.16 ON 2 2 JUNK
11:45 2829 multifoils 3.16 ON 2 2 2 M
right arm run 2830 is JUNK
Start of Kinematics 6.10
Right arm: momentum 3.160, angle: 12.5
Left arm: momentum 3.17, angle: 18
Beam 10 uA
Target raster Beam lambda/2 Target Lambda/2
ref empty cell ON OUT OUT
right arm run: left arm run
Time Run number N. of Events Time: Run number N. of Events
12:14 2831 1.6 M 12:14 22830 1.4 M
Beam 2.3 uA
Target raster Beam lambda/2 Target lambda/2
N2 ref. cell ON OUT OUT
(140 psig)
right arm run left arm run
Time Run Number N. of Events Time Run Number N. of Events
13:05 2832 2 M 13:05 22831 1.2 M
It seem that the beam spot size is bad again and, as a consequence, the Compton polarimeter does not perform correctly.
The target was shift to single Carbon at 13:45 to allow beam tuning.
one run with single foil carbon target was performed to increase statistics:
Time: 13:49 Right Arm Run Number 2833 Left arm Run Number 22833
14:12 beam tuning is over (even if the beam size is not completely satisfactory).
14:30 Harp scan these are the result:
scanner 5
absolute beam h position -619 um
absolute beam v position -190 um
Horizontal sigma 158 um
Vertical sigma 98.73
scanner 6
absolute beam h position -541 um
absolute beam v position 44 um
Horizontal sigma 237 um
Vertical sigma 74.50
right arm run 2834 is JUNK
14:48 a checking run with single foil carbon target is performed
Right arm Run number 2835, Left arm Run number 22834
3M events collected in right arm, 0.2 M in right arm.
15:15: back to Kinematics 6.10
Beam 2.3 uA
Target raster Beam lambda/2 Target lamba/2
3He 0 deg ON OUT OUT
right arm runs
Time Run Number PS1 PS2 N. of Events
15:15 2836 1 1 2 M
15:33 2837 1 1 2.2 M
15:51 2838 1 1
left arm runs
Time Run Number N. of Events
15:15 22835 0.155 M
15:33 22836 0.190 M
15:51 22837
15:45 bleedthrough measurement performed:
bleedthrough 1.84%
Slit Position 33
Attenuator 275