Moeller Polarimeter Raw Results Archives 2002

Beam Polarization: Raw Results 2002

Results 2002

05 February 2002 9:15-11:15.

The beam energy is 5.784 (accel) or 5.754 (Tiefenback). Injector angle is -34.^o, the 1/2 wave plate was OUT.

The laser frequency provided a bulk extraction from the GAs crystal, the polarization expected was therefor about 30-40%.

LG1 tripped at high HV and was therefore turned off.

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 comments
angle Polarization % angle Polarization %

10101-10102 90.0 - 0.35uA - - thr=130mV, raster ON

10090-10095 23.0 32.7+/-0.3 19.0 31.8+/-0.3 90. Large BCM asymmetry

10096-10099 163.5 31.2+/-0.4 159.0 32.0+/-0.4 98.

Average - 32.0+/-0.3 - 31.9+/-0.3 - Av: 32.0+/-0.3 Dead time not included

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	comments
angle	Polarization %	angle	Polarization %
10101-10102	90.0	-	0.35uA	-	-	thr=130mV, raster ON
10090-10095	23.0	32.7+/-0.3	19.0	31.8+/-0.3	90.	Large BCM asymmetry
10096-10099	163.5	31.2+/-0.4	159.0	32.0+/-0.4	98.
Average	-	32.0+/-0.3	-	31.9+/-0.3	-	Av: 32.0+/-0.3 Dead time not included

The BCM asymmetry was huge: -0.003, and the BCM correction was dramatically increasing the difference between coil + and coil - data.

The full information is given here .
The final results:
Pz= 32.0 +/- 0.3(stat) +/- 3.0(syst-prelim) (1/2 wave plate OUT, -34.^o Wien angle) (dead time correction DONE, assumed to be about 0.3%)

17 February 2002 9:15-15:45.

The beam energy is 3.484 (accel) or 3.4786 (EP/Arc at 5 passes). Injector angle is 60.^o and 45.^o, the 1/2 wave plate was OUT.

LG1 tripped at high HV and was therefore turned off.

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. Threshold=80mV, raster ON. The error is statistical only.
runs Dial angle Calculated angle chi2 comments
angle Polarization % angle Polarization %

10103-10105 23.0 - 0.33uA - - thr=40mV, attenuator=107 slit=-1.0

10115-10116 90.0 - 0.33uA WIEN filter=60^o - thr=80mV, attenuator=107 slit=-1.0

10107-10114 23.0 76.2+/-0.25 18.3 73.9+/-0.25 13. Large BCM asymmetry

10117-10124 163.5 70.6+/-0.25 159.6 72.3+/-0.25 19.

Average - 73.4+/-0.2 - 73.1+/-0.2 - Av: 73.3+/-0.2 Dead time not included

10125 163.5 66.7+/-1.6 0.13uA - - BCM calibration

10126 163.5 -72.9+/-0.8 0.6uA - - BCM calibration

10127 163.5 71.4+/-0.6 1.18uA - - BCM calibration

10128 163.5 -69.7+/-1.3 0.26uA - - BCM calibration

10129 163.5 57.6+/-1.5 0.06uA - - Hall A laser OFF, cross-talk from Halls C&B

10130 163.5 -61.4+/-1.4 0.06uA - - Hall A laser OFF, cross-talk from Halls C&B

10131 163.5 56.0+/-1.9 0.06uA - - Hall A laser OFF, cross-talk from Halls C&B

10132 163.5 -75.1+/-0.7 0.30uA - - Attenuator=318 slit=16

10133 163.5 42.8+/-4.0 0.03uA - - Hall A laser OFF, cross-talk from Halls C&B

10134-10141 163.5 74.2+/-0.2 - - 9.
10142-10143 163.5 77.2+/-0.5 0.25uA WIEN filter=45^o - BCM calibration

10144-10145 163.5 59.5+/-5.5 0.03uA - - Hall A laser OFF, cross-talk from Halls C&B

10146-10147 163.5 77.6+/-1.0 0.03uA - - BCM calibration

10148-10149 163.5 77.6+/-0.7 0.25uA - - BCM calibration

10150-10151 163.5 77.3+/-0.5 1.35uA - - BCM calibration

10152-10153 163.5 77.3+/-0.7 0.46uA - - BCM calibration

10162-10163 90.0 - 0.3uA - - thr=80mV, attenuator=318 slit=16

10165-10172 23.0 82.1+/-0.25 17.8 79.4+/-0.25 30.

10154-10161 163.5 78.1+/-0.25 159.2 80.1+/-0.25 15.

Average - 80.1+/-0.25 - 79.7+/-0.2 - Av: 79.9+/-0.2 Dead time not included

10181-10182 90.0 - 0.3uA WIEN filter=60^o - thr=80mV, attenuator=318 slit=16

10173-10180 23.0 80.2+/-0.25 17.9 77.5+/-0.25 9.

10183-10190 163.5 73.3+/-0.25 159.2 75.3+/-0.25 9.

Average - 76.8+/-0.2 - 76.4+/-0.2 - Av: 76.6+/-0.2 Dead time not included

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. Threshold=80mV, raster ON. The error is statistical only.
runs	Dial angle	Calculated angle	chi2	comments
angle	Polarization %	angle	Polarization %
10103-10105	23.0	-	0.33uA	-	-	thr=40mV, attenuator=107 slit=-1.0
10115-10116	90.0	-	0.33uA	WIEN filter=60^o	-	thr=80mV, attenuator=107 slit=-1.0
10107-10114	23.0	76.2+/-0.25	18.3	73.9+/-0.25	13.	Large BCM asymmetry
10117-10124	163.5	70.6+/-0.25	159.6	72.3+/-0.25	19.
Average	-	73.4+/-0.2	-	73.1+/-0.2	-	Av: 73.3+/-0.2 Dead time not included
10125	163.5	66.7+/-1.6	0.13uA	-	-	BCM calibration
10126	163.5	-72.9+/-0.8	0.6uA	-	-	BCM calibration
10127	163.5	71.4+/-0.6	1.18uA	-	-	BCM calibration
10128	163.5	-69.7+/-1.3	0.26uA	-	-	BCM calibration
10129	163.5	57.6+/-1.5	0.06uA	-	-	Hall A laser OFF, cross-talk from Halls C&B
10130	163.5	-61.4+/-1.4	0.06uA	-	-	Hall A laser OFF, cross-talk from Halls C&B
10131	163.5	56.0+/-1.9	0.06uA	-	-	Hall A laser OFF, cross-talk from Halls C&B
10132	163.5	-75.1+/-0.7	0.30uA	-	-	Attenuator=318 slit=16
10133	163.5	42.8+/-4.0	0.03uA	-	-	Hall A laser OFF, cross-talk from Halls C&B
10134-10141	163.5	74.2+/-0.2	-	-	9.
10142-10143	163.5	77.2+/-0.5	0.25uA	WIEN filter=45^o	-	BCM calibration
10144-10145	163.5	59.5+/-5.5	0.03uA	-	-	Hall A laser OFF, cross-talk from Halls C&B
10146-10147	163.5	77.6+/-1.0	0.03uA	-	-	BCM calibration
10148-10149	163.5	77.6+/-0.7	0.25uA	-	-	BCM calibration
10150-10151	163.5	77.3+/-0.5	1.35uA	-	-	BCM calibration
10152-10153	163.5	77.3+/-0.7	0.46uA	-	-	BCM calibration
10162-10163	90.0	-	0.3uA	-	-	thr=80mV, attenuator=318 slit=16
10165-10172	23.0	82.1+/-0.25	17.8	79.4+/-0.25	30.
10154-10161	163.5	78.1+/-0.25	159.2	80.1+/-0.25	15.
Average	-	80.1+/-0.25	-	79.7+/-0.2	-	Av: 79.9+/-0.2 Dead time not included
10181-10182	90.0	-	0.3uA	WIEN filter=60^o	-	thr=80mV, attenuator=318 slit=16
10173-10180	23.0	80.2+/-0.25	17.9	77.5+/-0.25	9.
10183-10190	163.5	73.3+/-0.25	159.2	75.3+/-0.25	9.
Average	-	76.8+/-0.2	-	76.4+/-0.2	-	Av: 76.6+/-0.2 Dead time not included

The BCM asymmetry was huge and very different: 0.0008-0.006

The full information is given here . The plot is given here .
The final results:
Pz= 76.6 +/- 0.2(stat) +/- 3.0(syst-prelim) (1/2 wave plate OUT, 60.^o Wien angle)

22 February 2002 2:46-3:45.

The beam energy is 3.4786 (arc, ep). Injector angle is 60.4.^o, the 1/2 wave plate was OUT.

LG1 tripped at high HV and was therefore turned off.

Mott: -73.4+/-1.3 (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 comments
angle Polarization % angle Polarization %

10202-10203 90.0 - 0.28uA - - thr=80mV, raster ON

10194-10201 23.0 81.6+/-0.3 18.5 79.2+/-0.3 1.0 Large BCM asymmetry

10204-10211 163.5 75.1+/-0.3 160.0 76.6+/-0.3 3.1

Average - 78.3+/-0.2 - 77.9+/-0.3 - Av: 78.13+/-0.2 Dead time not included

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	comments
angle	Polarization %	angle	Polarization %
10202-10203	90.0	-	0.28uA	-	-	thr=80mV, raster ON
10194-10201	23.0	81.6+/-0.3	18.5	79.2+/-0.3	1.0	Large BCM asymmetry
10204-10211	163.5	75.1+/-0.3	160.0	76.6+/-0.3	3.1
Average	-	78.3+/-0.2	-	77.9+/-0.3	-	Av: 78.13+/-0.2 Dead time not included

The BCM asymmetry was huge: -0.006. Slit=15.5, Laser attenuator=340

The full information is given here . The plot is given here .
The final results:
Pz= 78.13 +/- 0.2(stat) +/- 3.0(syst-prelim) (1/2 wave plate OUT, 60.4^o Wien angle) (dead time correction DONE, assumed to be about 0.3%)

04 October 2002 02:00-08:00.

The beam energy is 4.056 (arc, ep). Injector angle is 75.2.^o, the 1/2 wave plate was OUT.

Problems with DAQ - Helicity signal in TIR is messed up. Helicity in ADC is used. Helicity 1-st sychro is messed up.

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 comments
angle Polarization % angle Polarization %

10305-10306 90.0 - 0.28uA - - thr=120mV, raster ON

10301-10304 23.0 81.3+/-0.5 19.0 79.1+/-0.5 1.3

10307-10310 163.5 76.7+/-0.5 160.5 78.0+/-0.5 1.5

Average - 78.9+/-0.4 - 78.5+/-0.4 - Av: 78.8+/-0.4 Dead time not included

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	comments
angle	Polarization %	angle	Polarization %
10305-10306	90.0	-	0.28uA	-	-	thr=120mV, raster ON
10301-10304	23.0	81.3+/-0.5	19.0	79.1+/-0.5	1.3
10307-10310	163.5	76.7+/-0.5	160.5	78.0+/-0.5	1.5
Average	-	78.9+/-0.4	-	78.5+/-0.4	-	Av: 78.8+/-0.4 Dead time not included

The full information is given here . The plot is given here .
The final results:
Pz= 78.7 +/- 0.4(stat) +/- 3.0(syst-prelim) (1/2 wave plate OUT, 75.2^o Wien angle) (dead time correction NOT DONE)

08 October 2002 9:30-15:00.

The beam energy is 2.056 (arc, ep). Injector angle is -30.^o, the 1/2 wave plate was OUT.

At the beginning we had problems with DAQ - the ADC trigger (#1) was running spuriously with no gate signal. Also, as a week before, the input signals in the TRI (trigger module) were wrong. Plugging/unplugging the ECL cables fixed the problem... The input#8 was moved to a different NIM-ECL module.

Dipole scan shows that the dipole is close to the optimum see the plot .

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 comments
angle Polarization % angle Polarization %

10351-10352 90.0 - 0.28uA - - thr=240mV, raster ON

10345-10350 23.0 -84.6+/-0.4 18.4 -82.1+/-0.4 2.5

10352-10358 163.5 -84.4+/-0.4 160.0 -86.1+/-0.4 1.0

Average - -84.5+/-0.3 - -84.1+/-0.3 - Av: -84.3+/-0.2 Dead time not included

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	comments
angle	Polarization %	angle	Polarization %
10351-10352	90.0	-	0.28uA	-	-	thr=240mV, raster ON
10345-10350	23.0	-84.6+/-0.4	18.4	-82.1+/-0.4	2.5
10352-10358	163.5	-84.4+/-0.4	160.0	-86.1+/-0.4	1.0
Average	-	-84.5+/-0.3	-	-84.1+/-0.3	-	Av: -84.3+/-0.2 Dead time not included

The full information is given here . The plot is given here .
The final results:
Pz=-84.3 +/- 0.2(stat) +/- 3.0(syst-prelim) (1/2 wave plate OUT, -30.0^o Wien angle) (dead time correction NOT DONE)

09 October 2002 16:30-18:00.

The beam energy is 2.056 (arc, ep). Injector angle is -30.^o, the 1/2 wave plate was OUT.

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 comments
angle Polarization % angle Polarization %

10368-10369 90.0 - 0.28uA - - thr=240mV, raster ON

10362-10367 22.5 -79.3+/-0.4 17.9 -77.0+/-0.4 1.3

10370-10375 163.5 -76.0+/-0.3 160.9 -77.1+/-0.3 0.9

Average - -77.7+/-0.2 - -77.1+/-0.2 - Av: -77.4+/-0.2 Dead time not included

10376-10377 163.5 -75.3+/-0.3 0.88uA - 0.9

10378-10381 163.5 -76.3+/-0.3 0.46uA - 0.9

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	comments
angle	Polarization %	angle	Polarization %
10368-10369	90.0	-	0.28uA	-	-	thr=240mV, raster ON
10362-10367	22.5	-79.3+/-0.4	17.9	-77.0+/-0.4	1.3
10370-10375	163.5	-76.0+/-0.3	160.9	-77.1+/-0.3	0.9
Average	-	-77.7+/-0.2	-	-77.1+/-0.2	-	Av: -77.4+/-0.2 Dead time not included
10376-10377	163.5	-75.3+/-0.3	0.88uA	-	0.9
10378-10381	163.5	-76.3+/-0.3	0.46uA	-	0.9

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

For the dead-time correction measurements were done at 0.2, 0.46 and 0.95µA (see the plot ). Extrapolation to zero beam current would give a correction of 0.33±0.05% absolute, or 0.41±0.06% relative to the beam polarization.

The final results:
Pz=-77.4 +/- 0.2(stat) +/- 3.0(syst-prelim) (1/2 wave plate OUT, -30.0^o Wien angle) (dead time correction NOT DONE)

14 October 2002 18:30-19:30.

The beam energy is 2.056 (arc, ep). Injector angle is -30.^o, the 1/2 wave plate was OUT.

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 comments
angle Polarization % angle Polarization %

10393-10394 90.0 - 0.28uA - - thr=240mV, raster ON

10385-10393 22.5 -77.8+/-0.3 18.8 -75.9+/-0.3 3.1

10395-10400 163.5 -74.2+/-0.3 161.0 -75.2+/-0.3 4.0

Average - -76.0+/-0.2 - -75.6+/-0.2 - Av: -75.8+/-0.2 Dead time not included

10401 163.5 . . - . BCM calibration: 0,0.48µA,1.0µA

10402 none . - . . no target BG at 0,4.8,19.4µA

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	comments
angle	Polarization %	angle	Polarization %
10393-10394	90.0	-	0.28uA	-	-	thr=240mV, raster ON
10385-10393	22.5	-77.8+/-0.3	18.8	-75.9+/-0.3	3.1
10395-10400	163.5	-74.2+/-0.3	161.0	-75.2+/-0.3	4.0
Average	-	-76.0+/-0.2	-	-75.6+/-0.2	-	Av: -75.8+/-0.2 Dead time not included
10401	163.5	.	.	-	.	BCM calibration: 0,0.48µA,1.0µA
10402	none	.	-	.	.	no target BG at 0,4.8,19.4µA

The full information is given here . The plot is given here .
The final results:
Pz=-75.8 +/- 0.2(stat) +/- 3.0(syst-prelim) (1/2 wave plate OUT, -30.0^o Wien angle) (dead time correction NOT DONE)