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Title: A close look at beam aborts with rise times less than 40 ms from the years 2014-2016. Case studies.

In an effort to understand the risks of operating RHIC with an additional delay of 40 ms in the abort system, all beam aborts triggered by loss monitors at store from the years 2014, 2015 and 2016 were analyzed; and particularly fast cases, selected. The results were presented at the RHIC retreat on Jul 29, 2016. All beam aborts at injection, during the ramp and at flattop but before the “ev-lumi” event were ignored since the additional delay of 40 ms is proposed for operation at store only. Many (but not all) of the 15 studied cases are of no concern. Cases with high damage potential are rare - but not rare enough. In order to make an added 40 ms during physics store conditions as safe as reasonably possible, additional permit inputs such as 10 Hz BF power supplies, RF storage cavities, power supply error states or BPMs, in addition to significantly reduced loss monitors (LM) thresholds for selected LM should be commissioned.
Authors:
 [1]
  1. Brookhaven National Laboratory (BNL), Upton, NY (United States). Relativistic Heavy Ion Collider
Publication Date:
OSTI Identifier:
1326760
Report Number(s):
BNL--112662-2016-IR
R&D Project: KBCH139; KB0202011; TRN: US1700028
DOE Contract Number:
SC00112704
Resource Type:
Technical Report
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States). Relativistic Heavy Ion Collider
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; BROOKHAVEN RHIC; BEAMS; FAILURES; MONITORS; HAZARDS; LOSSES; OPERATION; BEAM DYNAMICS Relativistic Heavy Ion Collider