Star-tpc-l mailing list

[Richard Witt <witt AT usna.edu>]

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

== Hardware

— Gas system is more stable now 

— watching MTD gas as well, appears to be working now

— now moving to working on magnet and verifying sensors

— expecting first collisions around April 23rd-25th

— drift velocity is roughly flat, trying to get back to ~5.55 cm/us

— lasers every 2 hours

== Electronics

— Flemming’s dead channel scan was successful

— Tonko has list (~7 pads that have always been dead)

— when poletips were installed there were some problems with various electronics going in and out

— maybe test after poletips is installed should be modified?

— perhaps test is too short

— summarized cosmics

— for FF have ~15 hours, 30 million triggers (Yuri sees 50 million)

— for RFF have ~12 million triggers

— zero field has ~9.7 million triggers (~8 million HLT)

— fast offline processes all events in all ADC files right now (not limited to 1000)

== Software

— Run 22 pp 500 SC

— Gene preparing staging for having enough DAQ files for each run to get SC for each run

— in pp500 that’s challenging due to the significantly higher SC (need to have enough good tracks to determine SC)

— developing procedure to determine how many files will be needed to get the needed number of good tracks

— good procedure already developed for finding SC efficiently

— putting the two together, we should be ready for production to find SC 

— expecting about 1.5 weeks for each SC pass 

— Yuri looking at cosmics that have been collected

— also watching lasers and drift velocity

— Tommy finished TpcRs tune-up for 2023 data

— Yuri will include as soon as possible

— working on fixing spread in ADC and time bucket values in simulation to match data

— simulation currently underestimates both

— also working on T0 offset and dE/dx differences between data and simulation

— several parameter adjustments have produced much better agreement

— final parameters and details available at link below

— https://www.star.bnl.gov/~ctsang/daq_2023AuAu200_TPC23_final

== AOB

— Nothing new reported this week

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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