Star-tpc-l mailing list

[Richard Witt <witt AT usna.edu>]

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

== Hardware

— TPC seems to be running okay

— east laser 3, optics are getting burned due to power of laser

— reduced laser power and moved optics 

— sector 4-5 needs investigation due to trip (HV module?)

— gas system is working perfectly

— was large storm, caused 4 mbar spike in just few minutes

— gas system managed, did not go into purge mode 

== Electronics

— the usual RDO and FEE outages occurring, nothing unexpected

— Tonko fixed large number of issues yesterday during access

— machine is running well overall, but that reduces time to fix things

— fast offline QA reported a strange “hole” in an outer RDO for a single run

— appeared to be off during part of the run

— some drops in ZDC due to leveling device (CAD has fixed it)

— see: https://drupal.star.bnl.gov/STAR/blog/videbaks/beam-leveling-issue

== Software

— TPC SC

— Run 25 need half field data calibration

— person identified for this

— Run 24 pp200 low-lumi SC calibration is done for all that is possible

— 1st 24 hrs of running there are no RICH scalars so no easy way to recover it

— will move forward with what is in hand for calibration production and return to the 24 hrs mentioned above

— TFG25e release

— SL24y_TFG25e compared with SL7_AL9 

— see https://drupal.star.bnl.gov/STAR/system/files/TbyT_TFG25e.pdf

— no significant differences between SL24y 32 and 64 bit nor between SL7 and AL9

— some difference in global tracks between SL24y and TFG25e (due to TPCCATracker)

— differences in primary tracks in is opposite direction (due to restriction on PV in SL24y?)

— difference in PVZ position, seems due to +-25 cm cut in SL

— no significant difference in momentum

— Evaluating information on support cone and structure

— will change radiation length budget

— Will revisit GMT geometry next

== AOB

— Nothing new for 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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