Minutes of the E00102 meeting
Thursday, October 4, 2001
BR

present:

MA  Mattias Andersson
FG  Franco Garibaldi
DH  Douglas Higinbotham
WH  Wendy Hinton
BM  Bob Michaels
BR  Bodo Reitz
AS  Arun Saha
LW  Larry Weinstein

1.) BR reports, that there are still many empty slots in the
    shift schedule, especially for the owl shifts.
    DH said, that many people did not receive the
    shift requests send to the halla email lists by AS.
    DH will prepare another shift request email and send
    it around

2.) We will try to be ready to start October 15.
    FG reported, that for RICH commissioning four shifts
    are needed - one for the polarity change, three four
    data taking. So we expect - assuming data taking is
    running smoothly - to give over to the RICH in the
    owl shift, Nov 20.

3.) LW reported about Count-Rate estimates
    - Taking into account data from Hall B, he concluded
      that our count rate (singles) will be smaller
      compared to KFs estimates, which should improve the
      signal to background ratio by up to a factor 5 at the
      high missing momenta
    - Using the known segmentation (3 foils) of the target  to
      apply further cuts, should also improve the signal to
      background ratio.

4.) AS asked about deadtime measurements, BR reported:
    a.) computer deadtime will be  measured with scalers, like
        in all experiments before. BM and BR are working on
        problems with doublepulsing. Part of this problem is
        due to noise from the Scintillators itself, which is unavoidable
        without increasing thresholds and therefore reducing the
        efficiency. They are preparing a setup to measure this
        effect.
    b.) independendly, the EDTM system is running: it
        was invented to get the electronics deadtime, but it
        can also be used to measure the total deadtime.
        it will be running at roughly 1 Hz and simulate
        coincident events in both arms.  It is also able
        to measure the dead time as function of scintillator number

5.) FG reported about the situation at the waterfall target:
    positioning and calibrations are tested at the moment.
    Next step is to test the system with water.
    Hopes, that everything is finished by tomorrow.
    FG asked about some kind of transfering the responsibility
    for the target to one of the shift workers during the experiment.
    LW pointed out, that we need to add waterfall related items
    to various checklists, we need a manual for the shift workers.
    There will be somebody on-call for the waterfall target.
    FG will arrange some kind of training for shiftworkers for
    everybody who is arround next week.

6.) LW asked for an alarm handler, which checks ratio of trigger rates
    to the beam charges. BM reported, that one could add something like
    this to the alarm handler.

7.) BM reported, that some work on EPICS and Scaler, Start and End-of-Run
    script needs to be done. MA will work on this together with BM.

8.) LW reported, that there is some convergence in how to check the
    allignment of the target with beam.

9.) BM mentionned, that he could synchronize the Scaler and Event
    readout, if wanted. We agreed, that this is usefull.

10.) The DAQ for the experiment will run on adaql2, online analysis
     mostly on adaql3, adaql1 is also available. There is a request
     from RCS to use adaqs2 in this time. BR will contact Ole Hansen,
     because RICH will also use adaqs2.

11.) DH asked, whether there will be a dedicated PC for the offline
     analysis available for this experiment. MA said, that he will
     be here at Jlab until next August, to analyse most of the
     data at the Lab. LW said, that there is Computing Power and
     Diskspace also available at ODU.

12.) There are further requests for doing some test runs for other
     experiments:

     - RCS wants to take some optics data at high momenta:
       but they want to have a extended optics target
       -> this is not installed yet, and it is too late to
          add it
       -> if they can live with a single foil or the waterfall
          we have no objections

     - BM wants to do some tests for future parity experiments
       these test are not effecting us at all.

     - RICH wants to run parasitically, most of the time without
       effect, for some runs, it might increase the deadtime

     - Jiang Xiaodong suggested to take some carbon data at
       low missing momenta. This would cost some time. Because
       this might result in physics data, it might be necessary to get
       approval from Kees and/or Jlab. We need to get more
       information, how much time he needs to get which kind of
       information.


13.) BR wants to give Ed Folts an update about the runplan, and
     the needed surveys, angle changes, polarity changes, momenta, ...
     Surveys are wanted before and after the experiment.
     We will schedule another survey at Nov. 13. If this is
     not doable, we will request one for Nov. 6.

14.) WH is working on espace and the needed kumacs. BR promised,
     that next week they could be tested with the HRSs and cosmic data.

15.) WH and MA should get pagers. DH will take care of that topic.