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Subject: Commissioning and running of sPHENIX

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[Sphenix-run-l] notes from 9 o'clock meeting (6/30)

From: Stefan Bathe <stefan.bathe AT baruch.cuny.edu>
To: sphenix-run-l AT lists.bnl.gov
Subject: [Sphenix-run-l] notes from 9 o'clock meeting (6/30)
Date: Fri, 30 Jun 2023 21:25:57 -0400

RHIC (see attached slides)

- higher losses during ramp and transition since 6/23

- leading to beam aborts (by now we’ve had three or so)

- situation is degrading

- investigating

- might be equipment damage

- no concern for our detectors

- yesterday’s 12x12 test with bump to eliminate STAR backgrounds

- bump eliminated asymmetric background

- this apparently shows background is caused by Au78

- STAR background looks clean now

- unfortunately this bump is only suitable for a test

- trying to figure out how to get rid of Au78 in regular running

STAR

- very happy about result from background test

sPHENIX (see linked slides)

sdcc.bnl.gov

---------------------------------------------------------------------------------
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 9 o'clock meeting (6/30), Stefan Bathe, 06/30/2023