Star-tpc-l mailing list

[Richard Witt <witt AT usna.edu>]

Present: Gene, Jim, Flemming, Yuri, Frank, Tommy, and myself

== Hardware

— things continue running well in general

— lasers are still looking good

— gas system is still running well

== Electronics

— about 8% of iTPC FEEs are out right now

— were almost at 15% until Tonko fixed many yesterday

— STAR has much more luminosity with the crossing-angle running

— important to keep TPC deadtime below ~20% for present trigger mix

== Software

— Run 22 SC

— pass 3 finished, mostly converged except for a couple regions of fill (reasons understood, beamline constraint)

— will do pass 4 on ~25% of the data (needs 7-10 days)

— once TPC alignment is in can do pass 5 to evaluate impact of new alignment on SC

— Production with TFG24c

— test production is finished with available statistics

— see link: 

— several improvements observed

— primary vertex problems

— strange cluster(s) in old position vs. new position 

— need to understand in the context of vertex plots shown by UCD group

— work on TFG24c GitHub pull request approval is ongoing

— Frank requested expedited review of the code in GitHub and several other S&C folks have become involved

== AOB

— Flemming will not be present in 2 weeks

— shutdown of air handling recently due to storms but nothing observable in field cage currents

— Yuri needs estimate of real event rate on target; BBCA? BBCE? BBCW? Something else?

— window for timing count can actually include next crossing, so window needed to be moved

— observes small shifts in primary vertices in X and Y (millimeters), concern about multiple interactions in target

— probably best to check with Dan Cebra 

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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