Star-tpc-l mailing list

[Richard Witt <witt AT usna.edu>]

Present: Alexei, Jim, Flemming, Yuri, Gene, and myself == Hardware — Caen crate has some issue, needed access to recycle power — has occurred previously and even remote power cycle does not work — will put a remote hardware power switch — High

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

== Hardware

— Caen crate has some issue, needed access to recycle power

— has occurred previously and even remote power cycle does not work

— will put a remote hardware power switch

— High humidity is causing issues with the cathode

— humidity sensor on IFC blower indicates ~40% humidity (good)

— only west side TPC flow sensor causes problem

— will adjust sensitivity during next access

== Electronics

— still the usual losses and repairs of RDOs and FEEs

== Software

— sPHENIX had a slide in morning meeting about their space charge corrections

— concerns about fluctuations in shape of their field

— due to variations in multiplicity of collisions

— they have begun using measure of charge deposition in TPC by looking at current from readout (every ms)

— perhaps what they have done could inform any future studies in STAR

— for example, Jeff Landgraf has measurements of event size (data volume), for every event

— Transverse diffusion work

— some issues in RFF for long drift

— reasonable description of transverse diffusion from Magboltz

— need factor 10 more statistics to get for hit error parameterization 

== AOB

— No new topics this week

Best Regards,

  Richard

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-- 
"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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