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  • From: Richard Witt <witt AT usna.edu>
  • To: Star-tpc L <Star-tpc-l AT lists.bnl.gov>
  • Subject: [[Star-tpc-l] ] TPC Meeting Minutes
  • Date: Thu, 19 Dec 2024 13:18:35 -0500


Present: Alexei, Jim, Yuri, Flemming, Gene, Mathias, Emmy, Frank, Grazyna, Aihong, Tommy, and myself


== Hardware
— started work on east laser, changed lens and will work o n alignment
— quiet time is next week so, nothing can happen next week
— some further discussion about plans for TPC removal will take place then
— general plan is a destructive decommissioning of TPC
— group should consider over break if there are alternatives or interested parties
— Frank will help reiterate the notification to the STAR Council and, possibly, to the external community


== Electronics
— Tonko is done with west side
— RDO 4 in sector 24 issue was not communicated 
— inefficiency in rows across 3 and 4
— will notify Tonko and investigate


== Software
— looking for methods to speed-up production with new alignment
— at present, it is likely we will proceed with old alignment, at least initially
— STW stream Run 22 pp500 will be first
— dE/dx calibration production is needed first
— other streams of Run 22 pp500 have additional needs so there may be time for further assessment of speed-up possibilities
— Comparisons of embedding and data with P24iy
— see Mathias’ talk at: https://drupal.star.bnl.gov/STAR/system/files/p24iy_embedding_comparison.pdf
— nHits are about 40% lower in embedding than in data near target rapidity
— perhaps TPC length not properly taken in to account?
— DCA ratio shows data about 25% higher than embedding 
— FXT analyses often use DCA<1 cm to reject pile-up (from vertices > 5.5 cm away)
— lower pt tracks show some differences, ~20%, with embedding
— with an added nHits cut, agreement is good mostly everywhere _except_ target rapidity
— compared to October 2023 results, the problem around target rapidity has gotten worse
— with more pure pi+ sample, the nHits discrepancy at target rapidity improves, but some problem shows-up at low momentum
— Yuri asks for comparison of embedding between previous embedding and current embedding
— also check that new grid leak correction is on 
— suggestion is also to compare pi- rather than pi+
— would need a new sample of test embedding
— Gene commented that the event by event T0 has very little effect
— Matter-AntiMatter Differences and Spatial Distortion
— see Emmy’s talk: https://drupal.star.bnl.gov/STAR/system/files/presentation_2024-12-18.pptx
— comment that the phi dependence is partly a result of sag of OFC
— comment that there are multiple and higher order effects in distortions
— attempt to deal with them on average
— but some higher order effects may be responsible for eta or z-dependence
— request is to have study of straight-up tracks (radially outward) so as to eliminate z-dependence
— any remaining z-dependence would indicate presence of some other contributing distortion that does depend on z
— Yuri testing dE/dx calibration samples
— no difference so far
— having trouble pushing jobs through with SL24y
— new version of KFParticle without VC-library



== AOB
— Next meeting Jan. 9th 2025.

Best Regards,
  Richard

Sent from my iPad
-- 
"Education is the most powerful weapon which you can use to change
the world."

--Nelson Mandela

~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~
 Richard Witt, Professor of Physics     Phone (USNA): 410-293-6675
    United States Naval Academy         Email: witt AT usna.edu
~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~



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