Star-tpc-l mailing list

[Richard Witt <witt AT usna.edu>]

Present: Alexei, Flemming, Jim, Yuri, Tommy, and myself

== Hardware

— Not much new to report

— Mostly tracing cables

— Did walkthrough

— told need new locks for lasers

== Electronics

— adjusting some PS voltages to find somewhat better operating point

— this is to try to mitigate some blown fuses

— about 12 adjustments done so far

— some firmware changes still being made

== Software

— Irakli posted an update page on his alignment work

— see https://drupal.star.bnl.gov/STAR/blog/iraklic/Run-21-Alignment

— referring to last plot on page:

— need some checks, but it seems initial survey of inner sectors was sufficient without additional alignment procedure for outer sectors

— some asymmetry observed in high(er) momentum tracks for existing and new alignment procedures

— possibly need to confirm with opposite field polarity as well

— need to understand 

— would desire to start cosmics this year with FF to increase statistics

— next step will be supersector alignment

— final pass for clean-up of dead FEEs in BES data was prevented by power loss yesterday

— most corrections will be for Runs 20 and 21, 19 is mostly fixed

— expect to finish in few days

— may be an additional correction for PID in O+O that depends on mass hypothesis

== AOB

— Flemming expects to be absent for next two weeks

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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