Star-tpc-l mailing list

[Richard Witt <witt AT usna.edu>]

Present: Alexei, Flemming, Daniel, Mathias, Tommy, Yuri, Irakli, Gene, and myself

== Hardware

— last Monday was smoke alarm in STAR

— smelled something from TPC FEE rack

— found problem yesterday, was burned VME module (discussed on Star-Ops list)

— Tonko now continuing with TPC repair (FEEs etc.)

— replaced valves to fix leak (valve between purifier and dryer)

— replaced dryer and started purifier recovery yesterday

== Electronics

— nothing new to report this week

== Software

— FXT TPC Embedding studies by Mathias Labonte

— 3.2 and 7.7 GeV

— differences noted in nHits and DCA distributions as functions of eta and pt

— evidence of track breaking at central membrane?

— concern about jitter in trigger being root cause

— excess of hits in real data vs. embedding near end caps

— not yet well understood

— slides to be posted to the TPC list 

— supersector alignment work from Irakli

— still see some improvement from outer sector then inner sector alignment

— setting supersector alignment parameters to zero seems to already give resolution < 200 um (in Y)

— Yuri would like to repeat the K0 short study with no alignment parameters (survey result only)

— compare K0 mass with tracks from same sector and from different sectors

— reminder that for supersectors, some overall shift, overall rotation, and overall expansion are convoluted

— new method needed for supersector alignment

— Yuri looking at effect of different length cables on region near end cap

== AOB

— Gene asks for some feedback on the level of statistics needed in a calibration sample for Mathias’ studies 

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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