Star-tpc-l mailing list

[Richard Witt <witt AT usna.edu>]

Present: Alexei, Flemming, Jim, Yuri, Gene, and myself == Hardware & Electronics — STAR will likely be moved out late this week — survey has been concluded — not much is known of the schedule after that point — Much of the experiment close

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

== Hardware & Electronics

— STAR will likely be moved out late this week

— survey has been concluded

— not much is known of the schedule after that point

— Much of the experiment close to the beam line is still active above the limit

— not know how much can be recovered for distribution

== Software

— Gene working on Run 25 Au+Au SC 

— done and in the dB

— RFF only (not half field)

— around June 20th of that run, abort gap cleaning was activated

— may cause visible effects in TPC, but no impact was noted at levels of concern

— TFG26d release in preparation 

— includes modifications for run 25 and run 26

— TPC23 cluster finder has aggressive cluster chopping

— need an afterburner that tries to account for it, but need to redo hit errors

— in dE/dx fitting for tracks, need to account for ADC cut

— requires some new method to account for lost charge

— will need folks to evaluate 

— Yuri will be out for 2 weeks and then make release and ask for evaluations

— Would like to apply these corrections in AuAu 2023 data for cross check

— see Yuri’s blog for plans

== AOB

— 2026 TPC Survey Results

— see: https://drupal.star.bnl.gov/STAR/system/files/TPC%20Survey%202026.pdf

— overall, the TPC was extremely well engineered and constructed

— TPC matches the engineering design _at_every_location_ to better than a mm (often better than 1 mm)

— Jim sorted and QA’d data (some duplicate measurements and swapped identifiers noted)

— reminder: sectors are independent of AL end wheel (that’s why we use the brass survey points)

— reproducibility of measurements is ~0.2 mm in transverse plane and ~0.4 mm along beamline 

— so, even high precision point is likely good to only about 100 um

— only about 1/2 of total survey points could be measured due to scaffolding  

— Yuri points out that we requested measurements with respect to STAR magnet

— Jim requested a measurement of the magnet steel, but that request was declined

— will await Yuri’s analysis of extent of effects from inclusion of new survey data and present to collaboration if necessary

— NEXT MEETING: Sometime during week of 8 JUN 2026

Best Regards,

  Richard

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"Education is the most powerful weapon which you can use to change
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--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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