Star-tpc-l mailing list

[Richard Witt <witt AT usna.edu>]

Present: Alexei, Mathias, Jim, Emmy, Yuri, Flemming, Grzyna, Tommy, Gene, and myself

== Hardware

— some new rules about work in hall 

— have not been able to redo TPC movement measurement

— need second person in hall

— Yuri will join next week to accompany Alexei

— working on gas system

— also working on laser alignment

— west laser okay

— east laser is weak and needs some optics replaced

— next week will mostly be devoted to east laser repair

== Electronics

— Tonko and Tim continuing work on RDO recovery

— question about sPHENIX TPC performance

— Flemming mentioned there was a dE/dx plot in PAC meeting presentation

— Yuri mentioned there was an ADC plot that was called a dE/dx plot

— Gene mentioned they are facing an issue with low cluster charge in Au+Au (but not in p+p)

— perhaps related to contamination

    

== Software

— Run 22 p+p 500 SC

— nothing new for this week on SC

— BES-II data Au+Au 19 GeV collision data is now a priority

— need to look at effect of new alignment there

— need to do SC calibration for this sample and produce a dE/dx sample

— The production of 4p59GeV_fixedTarget with TFG24e continues. Now we have ~120 M event.

— TFG24f release has been done. This release includes cleaned by Maxym Zyzak KFPaticle and StKFParticlAnalysisMaker.

— TFG24g release will be next, including some modification with respect to Maxym’s version of  StKFParticlAnalysisMaker.

— To address Mathias’s plot for deuteron Yuri showed (https://github.com/fisyak/star-sw/blob/TFG/macros/Proton.C) 

— η dependence deuteron peak position can be explained by energy loss in beam pipe, IFC, and TPC gas.

— Mathias looking at several comparisons between TFG24e and the new alignment test production

— some anomalous concentrations in positions of first and last hits

— primary vertices found all the way across the TPC in Z

— vertexing may still be relying on some collider mode settings 

— interesting fall-offs in global tracks with >10 hits that are called primaries compared to global tracks with >10 hits

— Emmy looked at delta-m/m vs <Z> with and without tracks that cross the central membrane 

— previously observed w shape became more exaggerated rather than less

— not currently understood

== AOB

— Nothing new from 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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