Star-tpc-l mailing list

[Richard Witt <witt AT usna.edu>]

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

== Hardware

— TPC is running well so far

— gas system is okay

— some concern about liquid argon delivery

— started circulation mode at only .8 inches of liquid argon

— was resolved with delivery yesterday

— good for at least 80 days 

— injection will begin over next few days

— hope for usable events around June 8th

== Electronics

— Still have some difficulties in sectors 3 and 4 (will be masked out)

— two FEE are sending data with same ID (needs to be sorted out)

== Software

— at S&C meeting yesterday

— Run22 SCW file stream moved forward  with old TPC alignment

— was due to increase in time of tracking (due to hit errors)

— Spin and CQCD group was asked about usefulness of old alignment vs new

— can look at electron E/p from calorimeter (and TPC) in SCW file stream

— some mild correlation with h-/h+ -> perhaps TPC alignment?

— Gene put Emmy in touch with Temple group to see if a correction can be devised

— Yuri started laser drift velocity calculation

— looks good so far

— Yuri working on calibrations (Run23 O+O and Run23 Au+Au)

— for RunXXI OO200GeV ( see https://drupal.star.bnl.gov/STAR/system/files/RunXXI%20OO200GeV%20recalibration.pdf )

— big change in CPU time noted between dev on old nodes and containers on Alma Linux (50% change)

— also noted a jump in dE/dx (measured vs. predicted) on 6/26/2023

— believed to be related to change in methane bottle (different vendor?)

— for RunXXIII AuAu_2023 ( see https://drupal.star.bnl.gov/STAR/system/files/RunXXIII%20AuAu200GeV%20calibration.pdf )

== AOB

— Need two sub samples of 11 GeV reproduction to check which method to use for magnetic field

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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