star-tpc-l AT lists.bnl.gov
Subject: Star-tpc-l mailing list
List archive
- 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
~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~
"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
~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~
-
[[Star-tpc-l] ] TPC Meeting Minutes,
Richard Witt, 12/12/2024
- Re: [[Star-tpc-l] ] TPC Meeting Minutes, Van Buren, Gene, 12/12/2024
- <Possible follow-up(s)>
- [[Star-tpc-l] ] TPC Meeting Minutes, Richard Witt, 12/19/2024
Archive powered by MHonArc 2.6.24.