Minutes for Small Angle GDH Meeting, click here.
    Minutes for g₂ⁿ and A₁ⁿ Analysis Meeting, click here.
    Minutes for GDH Meeting, click here.
 

    Tentative Date of next Collaboration Meeting:  February 20-21, 2003
 
 

    Kees de Jager opened the meeting by discussing the schedule:
         Spin Duality will run in January and early February.  Beam studies will be
    done either a few hours every day, or Twelve hours every Tuesday.  The
    running period of Spin Duality is expected to finish by February 10.

        Kees reminded the collaboration that no one is allowed to work in the Hall
    alone, and work during the Christmas break should be discussed with Ed Folts.
    It is possible that the Hall may receive beam the last two days before the break.

     Nilanga Liyanage gave an overview of the experiment and discussed
    installation:
        The experiment will measure g₁ⁿ and A₁ⁿ in the resonance region, and by
    using DIS measurements, quark-hadron duality can be studied using spin
    structure functions.

        Kees suggested that the collaboration should check on the status of the Harps
    in the beam line.

        Nilanga is working on finishing the documents needed for the experiment (COO,
    RSAP, ESAD, etc.)

   Seonho Choi discussed the issues for the experiment:
        Seonho gave an overview of the installation progress.  For the experiment,
    there are no major software changes.  Two major issues that are of concern
    are the quality of the beam delivered and detectors.  See below for Patricia's
    report on the detector status.

        Before the Christmas break, a list of beam parameters should be given to Arun
    Saha.

        Target Operator training will be scheduled for January 3, 2003.  Trained Compton
    operators are also needed.

    Patricia Solvignon discussed the target installation:
       Sasha made two sets of RTDs for the experiment.  For the oven, Scot Spiegel
    will place the VAC controller in the Counting House.  Oven should be ready for
    the target survey on Tuesday, December 10.

        Patricia will make a spare oven RTD, and begin work on the laser alignment as
    soon as possible.

     Vincent Sulkosky discussed the target installation:
          Counting House electronics set up.  Helmholtz coils have been calibrated, and
    a field map of each coil has been completed.  The target lifting motor has been
    installed and local control works.  Limit switches need to be adjusted.

        For next week, Vince will set the holding field to 0 degrees and install the target
    ladder for the target and field survey.

        Vince will also contact Wolfgang Korsch to send spare electronics that are
    needed for the experiment.

    Kathy McCormick discussed the Target Control status:
        Once the equipment is set up, Kathy will test the EPICS controls.  The reference
    cell read back needs to be worked on, since there were problems during last year's
    running period.

        JP reminded Kathy that the gradient coil controls need to be added to the Target
    controls.  The power supplies for the gradient coils are standard and code has already
    been written for them.

    Bob Michaels gave an update on the DAQ and Raster systems:
         There will be two independent DAQs for Spin-Duality.  The L-arm DAQ will have
    ROC 14, which is prone to crash, but it should not crash more than once a day.

        Seonho Choi will help to check the Scaler readout for the G0 helicity mode.

        For the parity charge asymmetry feedback, Spin-Duality will be treated as a full-scale
    dry-run for HAPPEX.

    Xiaodong Jiang discussed helicity and detectors:
       The G0 helicity mode will be used.  On-line no one will know the helicity, but the
    source.

        For the detectors, the VDCs are fine.  Patricia has checked the gas cherenkov and
    the shower detectors.  See below for her report.  Detectors should be ready before
    Christmas.  The shift workers should check the gas bottle flow and go to the gas shed
    once per shift.

    Patricia Solvignon discussed the status of the PID detectors:
       The average number of  photoelectrons is less than 7 for all R-arm gas cherenkov
    PMTs.   All the PMTs will be changed.  Patricia will work with Bogdan  Wojtsekhowski
    to test and replace the PMTS.

        During the shower calibration, Patricia found that there were 6 missing shower blocks.
    Eugene Chudakov will help to find the missing blocks.

        For the L-arm gas cherenkov, two PMTs will be changed.  Patricia just started to look
    at the pion rejector.

    Jay Benesch discussed the Beam:
        The Accelerator division is working on getting good beam quality for all three halls.
    Electronics need to be connected for at least two of the three Hall A harps.  Additional
    harps in Hall A line should aid in beam tuning, once they are connected.

        There maybe a two day beam test before the Christmas break to test the ability to
    deliver beam to Hall A.

    David Lhuillier gave an update on the Compton polarimeter:
        The Compton polarimeter works well for 3,4, and 5 GeV incident beam energies.
    The total error for the measurement is about 1.4%.  New analysis code has been installed.
    On-line analysis is good to the 3% level, and code exists for a more thorough analysis
    off-line.

        Once the the polarimeter is up and running for the experiment, those wanting to be trained
    Compton operators will be trained.

    Eugene Chudakov discussed the Moller Polarimeter:
         For the Moller polarimeter, a new detector has been installed.  The systematic error is about
    3.4%, whereas, the statistical error is small (0.2% in ~ 1.5 hours).  Magnetization measured along
    the foil matched the foil thickness.

        A comparison of various foils with different thickness was made.  The 20, 40, and 50 micron
    foils matched well, but the one of the 100 micron foils was ~ 6% lower and a second 100 micron
    foil was ~3% lower.