12/16/2003

Target lab:

• Kathy:

     - Goal: have a cell in spin-up before Christmas.
     - Re-wrapped the oven pipe.
     - Ameya is aligning the lasers.
     - Kathy tested Nilanga's amplifier --> try matching the impedance and reducing the reflected power.

Small angle GDH:

• Vince:

     - put together scaler analysis of Spin Duality.
     - working on water calibration analysis.
     - optics optimization.


• Jing:

     - comparing results of the PID detector efficiency.


• Tim:

     - reported on the hybrid sphere made at WM --> showed a clear NMR signal.
     - looked at kin.9: BCM data looked good.


• Alexandre:

     - study of the 2 step-contamination
          --> looking only at the contribution coming from Berylium window
          --> used better absolute quantity, right Be form factors and aluminum FF for glass.
          --> got a factor 1.6 discrepancy.
          --> Possible explanations: Al. FF, no multiple scattering in the simulation, solid angle calculation.

Spin duality analysis:

• Patricia:

     - Found the problem with the deadtime calculation.
     - Showed preliminary false asymmetries using only carbon runs. Jian-ping and Alexandre suggested to use all unpolarized target data.
     - writting report on detector efficiencies.

     Plan
         - VDC and trigger efficiencies.
         - Elastic analysis.
         - Target analysis.

12/04/2003

General:

• Jian-Ping:

     - reported that 6 proposals and 4 letters of intent were submitted for PAC 25.
     - He encouraged everybody to read them and attend the talks.
     - reminded the upcoming GDH2004 meeting.

Target lab:

• Jing and Ameya:

     - Ameya got a good water signal.
     - Jing aligned the bottom laser line then Ameya will do the top one.
     - Jian-Ping precised that 4 longitudinal lines are needed.
     - Jian-Ping reported that William&Mary filled a cell. They don't know the lifetime yet.

Small angle GDH:

• Vince:

     - finishig optimization of y_tg at 6deg.
     - Used a quadratic function to fit the background under the water signals taken with the A-phi circuit.


• Jing:

     - Working on PID analysis.


• Tim:

     - working on the BCM calibration.
     - got good results for high current now he will work on the low current data.


• Jaideep:

     - was busy working for UVA lab.
     - Now he will focus on the VDC and Beta calibration and analysis.

Spin duality analysis:

• Patricia:

     - did Cerenkov cut efficiency analysis in a different way (read in Xiaochao's thesis).
     - then re-ran the PID efficiency analysis with the new cuts on Cerenkov.
     - regenerated the asymmetries after removing short runs and applying new PID cuts --> no obvious change in the asymmetries.
     - listed runs with high charge and/or deadtime asymmetries.
     - compared Ring Buffer and Scaler quantities: just for a few runs they disagree. Will have to find out the reason.

     Plan
         - Quick look at VDC and trigger efficiency.
         - Elastic analysis.
         - Target analysis.