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to January, 2002
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to November, 2001
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to October, 2001
02/28/2002
Target lab status:
-
Work finished: (Vince and Patricia)
Exodus characteris:
-
NMR-EPR calibration constant: 2.48%/mV;
-
Maximum polarization: 2.48 x 15.24 = 37.80%, spinup
curve: tlog #
252 ;
-
Gradient: 7.96 mG/cm, tlog #257;
-
AFP loss: 0.67% polarization, or 0.1 mV/sweep;
-
No masing effect observed;
-
Plan:(Patricia)
Keep working on the oven;
Finish tests on Exodus (temperature test);
Setup the new lasers for transverse pumping;
work with Vince on the new EPR-spectrum analyzer
design;
Test new oven controller;
-
Target lab status and List to do (Vince)
See summary
by Vince;
Target Analysis:(Kevin)
-
Cell position dependence study
A1n Analysis:
(Xiaochao)
-
Tried different models for Polrad20 (no iteration),
and different fits for g1/F1 from world data.
-
Plan:
Check results; Study the radiative correction for A2 (Aperp); Study the
effect of g2 to A1;
02/21/2002
Today's News:
-
Keith Griffioen showed his first
result of radiative correction for E99-117. He used RCSLACPOL, calculated
Apar(3He)_born and Apar(3He)_measured for three kinematic points.
Two models on elastic, 4 models on A1 and 4 models on g2 have been used
and results have been compared.
-
Next nGDH/GDH/A1n/g2n collaboration
meeting will be held on March 15 (Fri.) and 16 (Sat.);
Target lab status:
-
Work finished: (Vince and Patricia)
Brunhilde characteristics:
-
Maximum polarization: 38.9%;
-
lifetime: 39.9 hours, tlog #235;
-
Gradient: 6.9 mG/cm, tlog #240;
-
AFP loss: 0.6% polarization, or 0.07 mV/sweep;
-
Temperature test: Tpump=233.55, Ttarg=49.87 celcius;
-
EPR constant: kappa_0=6.701357;
-
No masing effect observed, tlog #237
;
-
NMR-EPR calibration constant: 2.95%/mV, tlog #233;
-
Plan:(Patricia)
Improve oven stability;
Testing Exodus;
-
Target lab status and List to do (Vince)
See summary
by Vince;
Target Analysis:(Kevin)
-
Cell position dependence study,
horizontal and vertical;
-
Pickup coil position dependence
study;
A1n Analysis:
(Xiaochao)
02/14/2002
Target lab status:
-
Work finished: (Patricia)
oven stablizes in 20 minutes;
Brunhilde spinup, NMR maximum gives 13.2mV, see
tlog #229
EPR at maximum and approximate result, see tlog
#228
Gradient test has to be done again;
AFP loss study gives 0.6% polarization loss (0.07mV/sweep), plot
-
Plan:(Patricia)
Improve EPR and NMR/EPR calibration;
Temperature test;
Redo gradient test;
Spin down during weekend;
-
Target lab status and List to do: (Vince)
See summary
by Vince;
g2n Analysis:(Kevin)
-
Continue pid and acceptance cut
dependence study for kinematics #4 and #5;
Asymmetry (for each of 4 configurations)
plot show small dependence, (or systematic effect?) but not bad.
-
Plan:
Continue cut study;
A1n Analysis:
(Xiaochao)
-
Use S1_R ADC cut for Taccept from data, exclude empty
events caused by right arm scaler open cable problem. Also did the
same cut for left arm runs. Result shows for left arm and right arm
PS=1 runs, there is <1E-4 effect on deadtime correction, with S1R ADC
cut vs. without; For right arm PS!=1 runs, achieve good deadtime
correction;
-
In Polrad, substitutue he3 elastic form factor by 1994
fit (Amroun et.al, Nucl. Phys. A579, (1994)596). The original code only
gives GE for q2<12 fm^-2 and GM for q2<30 fm^-2, and does not include
minimum;
-
Compare different fits for F2_p - NMC 1995 + original
resonance; NMC 1995 + Bodek's resonance, NMC 1995 + Stein's resonance,
Brasse(1994), play with resonance fit;
-
Bodo is going to do ep measurement analysis for A1n/g2n;
-
Plan:
Improving Polrad:
02/07/2002
News:
-
New schedule will have July/August
for installation (of Septum and the polarized He3) and Septum commissioning
Sept. 6-13, Small angle GDH (E97-110) will run from Sept 14 to Oct 14.
Since Accelerator will give away one cryo-module to FEL, there will be
no 6 GeV running. The maximum beam energy will be slightly higher than
5 GeV. So we will only run at 1 GeV, 1.5 GeV, 2 GeV, 3 GeV, 4 GeVand 5
GeV.
-
Next A1n/g2n/nGDH collaboration
meeting will be held soon, our choice will be Feb 22-23 or March 15-16
(or later).
Target lab status:
-
Oven stability: (Patricia)
tried Auto PID but worse;
then problem of communication between GUI and the
controller;
so increased temperature directly on the controller
box;
also changed PID parameters on the controller box
when being able to enter in the configuration menu without reset before
the changes;
At 170C, turned on lasers but oven didn't stablize
after 1 hour and one RTD seems to be touched by laser;
-
Work finished and result: (Vince)
RF calibration: done, result is good, see tlog #214
and very close to the one Jindong did in October.
Water calibration: done, signal quality is very
good, see tlog #216
, analysis in progress.
Brunhilde installed at 10am today;
-
Plan:
Continue working on oven;
Install new lifting moter during weekend;
Spin up on Brunhilde and find the maximum polarization;
Lifetime loss study;
Polarization loss study;
Looking for possible masing effect;
g2n Analysis:(Kevin)
-
Did pid and acceptance cut dependence
study for kinematics #1, #2 and #3;
Asymmetry (combined over 4
configurations) plot shows that, almost no dependence has been observed;
-
Plan:
Continue cut study for kinematics
#4 and #5;
Target Analysis:
(Kevin)
-
Study of NMR signal height vs.
flux (from vertical postion study);
A1n Analysis:(Xiaochao)
-
Use exact deadtime correction, which is event_type
dependent;
-
Use EDTM for right arm N2 ref cell runs, #20389~#20394.
During that time, there was open cable for right Taccept, which cause Taccept
in scaler events incorrect for run with PS!=1. However, the problem
is, in that case, EDTM was also not working correctly. Need to spend
some time to prove a "theory" for deadtime from EDTM; If this "theory"
is true, then the result so far I got from EDTM is reasonablly good.
-
Plan:
-
Elastic Analysis:
Check EDTM for right arm N2 ref cell runs;
Nilanga is checking optics/database; Bodo is helping
with EDTM study and BPM correction;
Study W(3he) sensitivity of elastic cross section;
Check N2 radiation effect caused by different wall
thickness of Gore and reference cell; (some help from Alexandre)
-
Pick up asymmetry analysis and radiative correction
(Polrad), focus on resonance region model dependence.