Star-tpc-l mailing list

[Richard Witt <witt AT usna.edu>]

Present: Alexei, Flemming, Tommy, Yuri, Gene, and myself

== Hardware

— email came from power supply company, they received PO

— will start to build spare PS (~1 month)

— new 6-pack of methane

— DV seems to be coming back to normal

— have about 40 days of gas

— trying to understand why some 6-packs are “bad” (affect DV) and others are okay

— Alexei trying to compare with reference gas from a small bottle he has

— has located a gas chromatography group at the lab and will ask about doing comparison work

== Electronics

— system is behaving well with low intensity beams

— full system has been included for about 2 weeks

— with saturated minbias ZDC rate is ~13 kHz

— can record at ~4.2 kHz in those conditions

== Software

— Gene wants to look for distortions due to increase in gated grid rate

— SC & GL for d+Au 200 is a high priority for working groups

— Babu is currently very busy with thesis work but can likely wrap-up soon

— other priority is AuAu 17.3 GeV calibrations

— Gene started on it yesterday, through one iteration so far

— hope is to finish in next few days

— will then do calibration production for dE/dx and bToF

— Run 22 pp500 is the other activity for calibrations

— Richard from Temple is getting started there

— Flemming mention the beam line into STAR has moved by a couple millimeters in past few days

— Gene will look at impacts from that

— Irakli is continuing alignment work 

— results using DAQ file and event files are different

— DAQ files are not ordered by event number but event files are

— Yuri does not find significant differences when reading event files in same order as events were collected (order in DAQ file)

— Tommy estimated SC from files

— also compared PV reconstruction from east and west individually, there is a difference

— plots are attached to previous TPC meeting agenda

— Yuri believes the result is an overestimated efficiency

— may be a reproduction of 2019 and 2020 FXT, Gene may try to reproduce the calibration to remove the problem

— problem will still exist in P21ib

— Gene will look into comparing with work previously done by Irakli

— if there is a difference we may need to include the correction for the reproduction

— Yuri still looking into combined PID

== AOB

— Pull requests from Yuri and others are taking extremely long to be approved due to requiring two independent approvers

— TPC group will request that either Richard W. be added as an approver for pull requests on TPC software, or the requirement be reduced to one approver

— Richard will follow-up with Frank on this

Best Regards,

  Richard

Sent from my iPad

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

--Nelson Mandela

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