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Subject: Commissioning and running of sPHENIX

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[Sphenix-run-l] Notes from Time Meeting and Coordination Meeting 5/30

From: Stefan Bathe <stefan.bathe AT baruch.cuny.edu>
To: sphenix-run-l AT lists.bnl.gov
Subject: [Sphenix-run-l] Notes from Time Meeting and Coordination Meeting 5/30
Date: Tue, 30 May 2023 14:49:41 -0400

Notes from 5/30 Time Meeting

sPHENIX magnet will suppress electron clouds in beam pipe; a couple hundred gauss will be enough, makes for lower backgrounds, good to keep in mind for MVTX commissioning

STAR has taken 330 M mbias events

- sTGC tracker that had suffered beam loss damage is operational again

- still seeing background events (see attached image below): right picture is about size of sPHENIX magnet bore

Transfer switch test at 1008 tomorrow morning 9:30am-10:00am (emergency power)

Notes from 5/30 Coordination Meeting

- pause magnet ramping tomorrow during transfer switch test

- STAR DAQ limited to about 2 kHz (also limiting ZDC rate to 10 kHz via leveling)

- DAQ rate expected to upgrade to 5 kHz in 3 weeks, then level to about 14 kHz (to be determined)

- maintenance work finished early, beam overnight!—will be dumped at 7:00am tomorrow to continue magnet ramping tests

- stochastic cooling setup might take whole day Thursday, i.e. we might want to postpone turning on our magnet until Friday

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Stefan Bathe

Professor of Physics
Baruch College, CUNY
and RIKEN Visiting Scientist

Baruch: BNL:
17 Lexington Ave Bldg. 510
office 940 office 2-229
phone 646-660-6272 phone 631-344-8490
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[Sphenix-run-l] Notes from Time Meeting and Coordination Meeting 5/30, Stefan Bathe, 05/30/2023