CONTINUOUS ABORT GAP CLEANING AT RHIC.
Since the RHIC Au-Au run in the year 2001 the 200 MHz cavity system was used at storage and a 28 MHz system during injection and acceleration. The rebucketing procedure potentially causes a higher debunching rate of heavy ion beams in addition to amplifying debunching due to other mechanisms. At the end of a four hour store, debunched beam can easily account for more than 50% of the total beam intensity. This effect is even stronger with the achieved high intensities of the RHIC Au-Au run in 2004. A beam abort at the presence of a lot of debunched beam bears the risk of magnet quenching and experimental detector damage due to uncontrolled beam losses. Thus it is desirable to avoid any accumulation of debunched beam from the beginning of each store, in particular to anticipate cases of unscheduled beam aborts due to a system failure. A combination of a fast transverse kickers and the new 2-stage copper collimator system are used to clean the abort gap continuously throughout the store with a repetition rate of 1 Hz. This report gives. an overview of the new gap cleaning procedure and the achieved performance.
- Research Organization:
- BROOKHAVEN NATIONAL LABORATORY (US)
- Sponsoring Organization:
- DOE/OFFICE OF SCIENCE (US)
- DOE Contract Number:
- AC02-98CH10886
- OSTI ID:
- 15008001
- Report Number(s):
- BNL-72087-2004-CP; R&D Project: AD-002-ADOP; KB020204; TRN: US0402948
- Resource Relation:
- Conference: 2004 EUROPEAN PARTICLE ACCELERATOR CONFERENCE (EPAC-04), LUCERNE (CH), 07/05/2004--07/09/2004; Other Information: PBD: 5 Jul 2004
- Country of Publication:
- United States
- Language:
- English
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