CERN Accelerating science

Published Articles
Report number	CERN-ACC-2019-094
Title	Beam manipulations with barrier buckets in the CERN PS
Author(s)	Vadai, Mihaly (Queen Mary, U. of London (main) ; CERN) ; Alomainy, Akram (Queen Mary, U. of London (main)) ; Damerau, Heiko (CERN) ; Gilardoni, Simone (CERN) ; Giovannozzi, Massimo (CERN) ; Huschauer, Alexander (CERN)
Publication	2019
Number of pages	4
In:	10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPTS107
DOI	10.18429/JACoW-IPAC2019-MOPTS107
Subject category	Accelerators and Storage Rings
Accelerator/Facility, Experiment	CERN PS
Abstract	A barrier bucket scheme is being considered to reduce losses during the Multi-Turn Extraction from the CERN Proton Synchrotron to the Super Proton Synchrotron for the fixed-target physics programme. For effective loss reduction, the extraction kicker has to be triggered during the gap at the time of the longitudinal barrier. Initial beam studies at injection energy and with low intensity beams allowed to fully qualify an existing wide-band cavity to generate one or multiple beam synchronous pulses per turn. Bunch-length stretching and shortening have been exercised with barriers moving in azimuth with respect to the beam. The encouraging results obtained at injection energy guided the implementation of a de-bunching manipulation at higher energy to move all bunches into a single barrier bucket. Beam measurements at a momentum of 14 GeV/c, varying intensity and the width of the barrier, demonstrate that a quasi-constant longitudinal line density and an almost fully depleted gap can be achieved at highest intensities. The contribution summarises the results of the beam studies at high energy together with some observations related to the Multi-Turn Extraction.
Copyright/License	Preprint: (License: CC-BY-3.0)

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