Star-tpc-l mailing list

[Richard Witt <witt AT usna.edu>]

Present: Alexei, Jim, Flemming, Yuri, ShinIchi, Frank, and myself

== Hardware

— FXT running geometry

— see: https://drupal.star.bnl.gov/STAR/system/files/Y2021vsY2025_0.pdf

— check of geometry in 2021 vs 2025 (3.85 GeV fixed target)

— differences visible in reconstructed vs simulated momentum, relative momentum, and others

— effect seems to be due to FST discs 

— suggestion is to remove FST discs on west side (during shutdown for ETOF)

— currently 2 possible schedules for ETOF work (each would need ~2 weeks)

— need a developed plan for steps required to extract FST

— how many days, installation support, technicians, periphery, testing (before and after closing pole tip)

— for TPC, a laser PC froze a couple days ago

— needed access for restart

— some new channels with lowered voltage (35 volts down)

— one power dip, recovered without issue

== Electronics

— currently 3 RDOs masked out

— many FEEs, but the number changes rapidly

== Software

— Yuri working on geometry and questions related to FXT running

== AOB

— O+O data set shows some shifts in local Z alignment of BToF with respect to TPC

— could be erroneous drift velocity entries in dB for a few days

— SC correction numbers are another possible cause 

— see https://drupal.star.bnl.gov/STAR/blog/dtorresva/Run21-OO-200-GeV-BTOF-and-VPD-Calibrations

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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