Star-tpc-l mailing list

[Richard Witt <witt AT usna.edu>]

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

== Hardware

— second oxygen sensor received

— to be installed later this week or next

— tomorrow west pole tip will be closed so measuring voltages

— strange readings on front panel

— tried using alternate (Glassman) meter to check 

— remote cathode HV is okay, currents are okay with remote meter

— front end problem not yet understood

— will also check end HV

== Electronics

— waiting for eToF work to finish on east side

— nothing in notes about sector 18 

— otherwise nothing new reported this week.

== Software

— sector 18 does not show any evidence of an issue on the TPC side

— Gene will circle back to the EMC folks to discuss further

— Run 22 SC (& GL)

— SC histograms shows no z-dependence of variations (would indicate presence of GL)

— so, even with high luminosity, it seems hardware fix with iTPC works well

— also, jobs running for SC corrections were running past their limit (< 3 days)

— working to have production account run these jobs

— getting asserts due to errant RICH scalar values (moves TPC hits beyond reasonable postions)

— sometimes SC correction can actually move hits by significant amount however

— result is, due to high SC in run, some hits move beyond 10 cm

— in the meantime, temporarily raised the limit to 20 cm and will revisit

— more troubling is there are differences between jobs run via the batch queue and jobs run manually

— Gene is pursuing this

— also noticed difference between optimized and unoptimized code 

— none of these affect the overall tracking results

— shows that the math done mostly in floats in StMagUtilities is good (no observable difference in tracking either way)

== AOB

— Richard W will present the TPC summary talk at the collaboration meeting

— final list of topics is TBD

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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