Star-tpc-l mailing list

[Richard Witt <witt AT usna.edu>]

Present: Alexei, Tommy, Yuri, Jim, and myself

== Hardware

— busy with ToF gas system

— still see activity from Tonko and others

— burned VME module was replaced, others cleaned

== Electronics

— nothing new to report this week

== Software

— TPC gating grid

— 3.85 GeV FXT data from May 2021

— see Yuri’s slides posted to meeting agenda on Drupal

— simulation does not properly reproduce the time difference in GG opening between inner and outer sector

— anomalous delay of ~200 ns and ~600 ns for outer and inner sectors

— Comparison of prompt hits

— prompt hit distribution on inner sector is different between reconstructed and MC 

— MC shows two peaks which is unusual in itself (possibly due to cluster finder?)

— RC shows three peaks

— in outer sector RC distribution is about 33 ns wider than MC (beta* = 10 m perhaps)

— Modifications in StTpcRSMaker, pull request #614

— unknown how to reproduce the problems of the failed test (about half)

— need to run tests interactively with particular library (but we don’t know how yet)

— work continuing on Run 22 SC 

— may need to start Run 23 SC soon, but currently no additional person power available

== AOB

— some desire to check alignment results with new data 

— look at 2023 data with 10 Mevts (cosmics)

— looked at old and new (IDL) alignment, but also used new hit errors 

— see approximately a factor 2 improvement in resolution in RFF 

— in addition, the number of matched pairs drops by ~2 so there is a need for supersector alignment as well

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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