Star-tpc-l mailing list

[Richard Witt <witt AT usna.edu>]

Present: Alexei, Gene, Jim, Zachary, Flemming, Mathias, Grazyna, Yuri, Frank, Petr, Daniel, and myself

== Hardware

— things continue running well in general

— lasers are looking good 

— had a very good run overnight

— gas system is running well

— sector 11-8 voltage being kept at 1100 V, hasn’t tripped since

== Electronics

— usual battle with RDO, we’ve lost about 7 iTPC RDOs and 4 TPX since last long access

— each time many are fixed and then we lose some quickly

— shift crew 

— nothing else new to report

== Software

— Run 22 SC

— calibration production about 2/3rds finished, need another week or so

— Production with TFG24c

— see slides on list from Petr

— 50% increase in probability of finding 3pi K0 decay with TFG test production

— increase seems to come from short tracks, high negative eta

— need to check with cuts to exclude possibility of reconstructing same vertex with split tracks

— maybe effect of loopers?

— also want to check proximity of vertices within an event

— Update on test production with new alignment (3.2 GeV FXT)

— see slides on list and in Drupal from Mathias

— observes what appears to be an azimuthal dependence of DCA Y shift 

— also observes an eta dependence of dE/dx integrated over azimuth

— also observes a dependence of amplitude, mean, and width of Gaussian fits to dE/dx momentum window as function of azimuth

— dE/dx in test production may need some calibration

— also a concern that observed azimuthal dependence may be affected by observed DCA Y shift

— Status of TFG24c production 

— see slides from Yuri at 

— https://drupal.star.bnl.gov/STAR/blog/fisyak/Progress-“-final-data-production-fixed-target-data-samples”%0Bupdate-08082024

— checking to ensure complete data sets have been processed (2019 and 2020 3, 4, 5, and 7 GeV FXT)

— K0 still shows a factor 5 improvement with better signal to background and improvement in width

— significant improvement in lambda baryons and hyper nuclei as well

  — ~factor 10 improvement in hypernuclei signal

— study of pi- dE/dx peak further shows need for dE/dx recalibration

— pull request has been made for TFG24c mini

== AOB

— Frank suggest writing to S&C leadership to ask for some priority to be given to TFG24c mini pull request

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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