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[videbaek <videbaek AT bnl.gov>]

TPC meeting June 19, 2025
Present: Yuri, Alexei, Gene, Flemming
Excused: Richard, Jim
Hardware:
No real issues. Some tuning of lasers and adjusting drift velocity by 
adjusting methane content.
Yuri sees a few spikes in offline analysis of vdrift. Likely, due to 
statistics will remove those runs
Electronics. Fairly stable. 2 outer rdo masked out. Remember to have 
this on list for next maintenance day. Qute from Tonko’s log (June 12)
o       TPX S18-4 and -5 masked
       problem with power, can’t power-up at the PS
       PS needs checking – Tim?
       until then – stays masked

In itpc a total of 53 FEE’s off (including one RDO)
Operation:
CAD wants to do gap cleaning when luminosity gores up. Gene alerted ops 
team that this should be monitored, and be done to minimize the unwanted 
extra space charge that comes from spray (from ~ 1 musec 10 clock 
cycles, but SC effect last seconds.) Best to have it done at intervals. 
Wors with Jeff to setup special runs+analysis (min bias + time ordering 
of events) to perform the DCA analysis
HLT group member (Bao??) is doing this for initial SCC to be used for 
HLT and fast offline.
Yuri:
Looking at 3.8Gev (?) de/dx calibration
Investigating some tracking efficiency issues with East tracks (Fix 
target) possible related to support code material applied in geometry 
description (geant and STI).
The proposed FXT run suggested to PAC of FXT 4.1 GeV run would need to 
understand the effect of FST material and support support structure for 
such FXT running, as this was not present for BES-II running.


--
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