TPC weekly

2021-01-27 15:00
America/New York
Wednesday, 27 January 2021
, at 20:00 (GMT), duration : 00:00
-- hardware status
-- startup plans

electronics update (Tonko)
a brief update regarding both TPX (aka outer sectors)
and iTPC (inner sectors) electronics and gating grid.

1) We have the new (Tim's) gating grid connected.
I calibrated it and it looks OK to me. But we should be
a bit weary because we had problems before.
One outcome is that it is relatively noisier at the
opening time than the old GG so one should pay attention.

2) The pulser runs have been taken and the gains
have been established as well as the bad-channel
list. Pretty much the same as last year because
we had no time (COVID and all) to mess with swapping
FEEs to check the problem and see where the
noise comes from: FEE or padplane.

The gains have been loaded into the database.

3) We _did_ swap the broken FEEs and RDOs.
As luck would have it, a single FEE in the ITPC worked
all Fall/Winter but failed as we closed the poletip.
It is masked.

Let's take it from here and see how we stand during

Charge for calibration review

Dear All,

  We just formed the STAR TPC calibration review committee. It is timely and critical to look at the offline calibration tasks and issues. The committee is charged to evaluate the readiness of the TPC calibration for the BES-II data production and provide answers to the following questions by the end of March 2021:


  1. What is the status of the tracking and production calibration? 
  2. Where is the bottleneck of the TPC calibration procedure? 
  3. Are there enough collaboration manpower and resources for the tasks? 
  4. How are the online/operation/fast-offline/PWGs efforts coordinated to accomplish the goals? 
  5. Is there a clear document of procedures in calibration and what are the unexpected and expected issues in BES-II datasets? What are the steps in calibration, and how are the current responsibilities assigned?
  6. What is the timeline and path toward completion of whole BES-II calibration for production? 
  7. Any lesson learned toward future runs?


The members are:

Zhangbu Xu (Chair)

Bill Christie

Carl Gagliardi

Frank Geurts

Marian Ivanov

Ivan Kisel

Tonko Ljubicic 

Maria Stefaniak

Jim Thomas

Qinghua Xu

Xin Dong (ex officio)

Rongrong Ma (ex officio)


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15:00Residuals re-tested ( 00:20 ) 0 filesIrakli
15:20Comparison express production TFG19e and calibration production P20ic_calib for 19GeV AuAu2019 data ( 00:20 ) 0 files