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[Daniel A Cebra <dacebra AT ucdavis.edu>]

Hi Flemming, The "hi lumi" part of the O+O run in 2021 is the portion using the production_ps_OO_200GeV_2021 trigger configuration. I think that the "ps" refers to the min bias being prescaled. This trigger configuration

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Hi Flemming,

   The "hi lumi" part of the O+O run in 2021 is the portion using the production_ps_OO_200GeV_2021 trigger configuration. I think that the "ps" refers to the min bias being prescaled.  This trigger configuration was run from May 16 to May 21, 2021.  Runs between 22136011 and 22141016. We were doing 45 minute long runs. We could use 22141001 as a characteristic hi lumi run.

Daniel

   

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From: star-tpc-l-request AT lists.bnl.gov <star-tpc-l-request AT lists.bnl.gov> on behalf of videbaek <videbaek AT bnl.gov>
Sent: Wednesday, January 28, 2026 4:07 PM
To: Star-tpc L <Star-tpc-l AT lists.bnl.gov>
Cc: Akio Ogawa <akio AT bnl.gov>; Ruan, Lijuan <ruan AT bnl.gov>; J.H. Lee <jhlee AT rcf.rhic.bnl.gov>
Subject: [[Star-tpc-l] ] tpc and OO running

 

Hi
In preparations for the OO running starting 3 days from now Lijuan asked
today for input from the TPC group in regard getting input from running
conditions. We should discuss this tomorrow, and needs answer ASAP as
star has to report back to on desired run configuration.

I assembled what I have heard and hope I got it correctly. Please
correct me if wrong.


In 2021 (May 10-24) the luminosity was ~400 kHz at injection (ZDC rates
it seems like). STAR will have to select the mode to run. Zero crossing
angle or a fixed. The Tandem will be able to deliver much mode lumi
(EBIS was used in 2021) with possible up to 1.8MHz. With zero crossing
angle, it is possible to do lumi levelling.

Question for TPC group as brought up in meeting today by Lijuan ad Gene
also attending.
What is the highest safe rate to run the TPC? What are the issues that
m=should be considered for these high rates.
Some initial point to consider and discuss tomorrow.
-       Will these rates cause beam trips?
-       What itpc Gain can we run pros et cons?
-       Can space charge effect be controlled?
-       How serious will the pileup and cluster merging be?
-       What is the expected max dat rate and dead time?
Some questions from me to trigger board, and tpc group.
-       What are the expected and desired rates in high lumi and low lumi
modes?
-       Can you point us to a high lumi run from run 21?
-       Just scanning scalers for 21 I do not see any HI-lumi runs in
May10-May24 (look at zdcAnd and BBCAnd- what did I miss – mainly run
with crossing angle???








--
Flemming Videbaek
senior scientist, emeritus
videbaek @ bnl.gov
Brookhaven National Lab
Physics Department
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Upton, NY 11973

phone: 631-344-4106
cell     :  631-681-1596