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                       E895 Minutes

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Date: 9 April 96

Present: Gulshan Rai, Tom Case, Marvin Justice, A. Dean Chacon,
         Thomas Wienold


News: 

Marvin Justice gave a report from his stay in Brookhaven/Stony Brook:

- The experiment E910 which uses the EOS TPC as a central part of 
  their detector system is running smoothly. Previously reported 
  problems with the DAQ have been resolved, the bad gating grid 
  pulser was replaced by a prototype from STAR, the online gain 
  calibration is working now. E910 is running with 2 exabyte drives 
  which is sufficient for their data rate. The problem with a leak 
  in the freon circuit of the cooler occured several times even after 
  local repairs by Brookhaven personal.

- Activities in Stony Brook:
   Paul Chang is working on the gain calibration and time offset 
  determination. 
   Agid looked at the low gain runs to extract the 
  beam location/angle. His extracted beam momentum of 3.5 GeV/c 
  seems to be too low compared to the reported value from AGS. 
  Further investigation is necessary.  
   Mark is working on pass 0 / pass 1 and general software infrastructure 
  on the DEC ALPHA machines. A
   Marvin has prepared a routine to do particle identification using 
  polynomial fits to dedx in slices of rigidity. His macro is available 
  and can easily be implemented.
   Heng Liu was also working on PID but results are not yet optimized.

- Kent State had a fast look on flow and dndy using preliminary PID.
 
Tom Case:
  
  - compared his new field map for the 1 Tesla field with the old 
    BNL field map. He found that both agree within 0.08 percent in 
    the mean values with a sigma of 0.2 percent. The rotation angle 
    between his field map and the old BNL field map is 0.09 deg with 
    a sigma of 0.07 deg. Tom believes that the 3/4 Tesla field could 
    be derived from a quadratic interpolation between the two maps 
    for 0.5 T and 1.0 T.



                                        prepared by Thomas Wienold