Star-tpc-l mailing list

[Richard Witt <witt AT usna.edu>]

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

== Hardware

— Tonko working on some lingering RDO and FEE issues

— so far TPC is running well

— DV reached 5.55 yesterday, trying to maintain

— still planning for 1st collisions on June 8th (56x56 bunches)

— magnet trip yesterday

— CID has done some repair work 

— magnet has already been returned to half field

— possibly reaching full field today if not already

— TPC air blower has reached high levels (yellow) of humidity

== Electronics

— sectors 3 and 4 noise

— requested pedestal runs and a short run to test after APEX

— will need to repeat exercise

— seems to be a time dependence to the effect (order of an hour)

— shift of about 3 to 4 units in pedestals

== Software

— Monitoring STAR magnetic field scale factor, NMR measurement

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

— Jim points out that dB values are unreliable for magnet current

— only NMR probe recently installed is reliable

— comparatively stable since 1997-98

— current measurement is only good to distinguish between FF, RFF, RHF, and ZF

— K0 mass is needed for absolute calibration

— need to set constant for all time

— Effect of new TPC alignment on Ks0 mass in 19GeV_2019 data sample

— see:  https://drupal.star.bnl.gov/STAR/system/files/Ks_0_19GeV.pdf

— Compare CPU speed for a reconstruction job on Alma Linux with native build and using apptainer with SL7 build

— see:  https://drupal.star.bnl.gov/STAR/blog/fisyak/Comparison-CPU-SL7-and-AL9-DEV-and-TFG

== AOB

— Magnet tripped 1220 (during this meeting)

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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