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[videbaek <videbaek AT bnl.gov>]

TPC meeting minutes
Present Yuri, Alexei, Jim, Gene and Flemming

Hardware
-       TPC works well
-       Issue with Lasers
o       Laser is a bit weak
-	There is clearly something wrong, the rate during laser runs is ~40 
whereas  it should be 10. Since the run was stopped after 4k events the 
statistics for the analysis of laser data and drift velocity thus has 
too small statistics, and unsatisfactory accuracy according to Yuri.
-	Alexei confirmed he would look at this when we gain access to the 
hall.
Electronics
Electronics in pretty good shape.
FV preparing QA macro for the ongoing runs with help from Gene. Some 
issue with have TPC QA histograms filled for cosmic data

Software
Gene is working on the high lumi FXT data for the new alignment. The 
results indicates a slight different slope on correction vs lumi measure 
, and with different offset. The offset change is not unexpected due to 
different alignment.

Yuri working on de/dx calibration for run 22. Different from BES-II is 
the importance of voltage sag and accumulated charge for the high 
luminosity pp 500 run. Sees de/dx of 7.2% for the standard candle (i.e. 
pathlength)
Also working on GMT calibrations.
Work hampered by getting too little cpu despite run in native alma9 mode 
on the farm.

--
Flemming Videbaek
senior scientist, emeritus
videbaek @ bnl.gov
Brookhaven National Lab
Physics Department
Bldg 510D
Upton, NY 11973

phone: 631-344-4106
cell     :  631-681-1596