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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)

Improve models in Polrad

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

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.

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