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  • From: yh66 <yh66 AT rice.edu>
  • To: Richard Witt <witt AT usna.edu>
  • Cc: Star-tpc L <Star-tpc-l AT lists.bnl.gov>
  • Subject: Re: [Star-tpc-l] TPC Meeting Minutes
  • Date: Thu, 27 Apr 2023 13:08:24 -0500

Hi All,
I would like to apologize for missing today's meeting. It appears that there was some misunderstanding regarding the observation of the low pt e-band in SL22b and SL23a. To clarify, the band was only observed in SL22b and not in SL23a. Additionally, the vertical band disappears in both SL23a and SL23b as seen in slides 9-12. The new method applied in both SL23a(b) has already resolved this issue.

Once again, I apologize for any confusion my absence may have caused, and please let me know if you have any further questions or concerns.

BW,
Yiding
Quoting Richard Witt via Star-tpc-l <star-tpc-l AT lists.bnl.gov>:

Present: Alexei, Gene, Jim, Yuri, Flemming, Prashanth, and myself

== Hardware
— many problems currently
— cathode readout producing spontaneous trips (fake, but shutdown PS)
— cleaned-up and testing today
— pulse production for calibration also lost proper control
— replacing battery and reprogramming
— TPC circulation started yesterday
— magnet testing today (FF polarity)
— after magnet testing done will try for cosmics and lasers
— TPC appears to be sitting at fullest extent of motion in one direction
(about 5 mm shift)
— northwest corner is fixed, look at motion on opposite side
— will check again when we have RFF polarity
— approximate time scale for having lasers and cosmics is today if all
goes well
— STAR will be ready in the next couple days at the outset

== Electronics
— Tonko (on vacation now) communicated with Flemming
— struggling with updating TPX firmware (not stable)
— running in test setup (not on TPC itself)
— can reach 3.2 kHz, but faster scrambles data (likely software
related)
— could impact physics goals for run (goals were based on 4.5-5 kHz)
— taking a step back temporarily
— will use first few weeks of run to improve
— new software framework on all DAQ PCs
— new cluster finder on TPC and TPX
— new network and events builders
— one iTPC sector (sector 1) running new firmware (need to watch it)
— make sure it’s stable in cosmics
— if so will update other firmware
— will start changing TPX firmware upon return
— Gene can process incoming cosmics once a day at start

== Software
— about presentation from Yiding (updated from last week)
— checked low pt e- band that was observed in SL22b in SL23a
— claim is strange band is visible in all BES data 
— band is not visible in SL23b processed data from 200 GeV O+O
— would be good to confirm by reprocessing an older set in SL23b
— Gene mentioned that the 19.6 GeV is already in the queue but may be
far down
— will look at doing calibration production in SL23c for comparison
— on extra gain calibration 
— mismatch in dB tables with actual RDO outages
— fixed some RDOs by hand for 2019
— tried applying same search to Runs 20-22 and found many mismatches
— lost RDOs
— Yuri has cleaned up Run 22, but many mismatches remain in other runs
— many are in Run 20 but 21 as well

== AOB
— Yuri will be absent next week
— but watching what’s happening with detector and cosmics
— Yuri will also look at O+O to analyze some questions about TPC but
also ToF

Best Regards,
  Richard

Sent from my iPad-- 
"Education is the most powerful weapon which you can use to change
the world."

--Nelson Mandela

~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~
 Richard Witt, Professor of Physics     Phone (USNA): 410-293-6675
    United States Naval Academy         Email: witt AT usna.edu
~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~







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