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Charge change-induced beam losses under dynamic vacuum conditions in ring accelerators

Omet, C. ; Spiller, P. ; Stadlmann, J. ; Hoffmann, D. H. H. (2024)
Charge change-induced beam losses under dynamic vacuum conditions in ring accelerators.
In: New Journal of Physics, 2006, 8 (11)
doi: 10.26083/tuprints-00020625
Article, Secondary publication, Publisher's Version

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Item Type: Article
Type of entry: Secondary publication
Title: Charge change-induced beam losses under dynamic vacuum conditions in ring accelerators
Language: English
Date: 13 February 2024
Place of Publication: Darmstadt
Year of primary publication: 28 November 2006
Place of primary publication: London
Publisher: IOP Publishing
Journal or Publication Title: New Journal of Physics
Volume of the journal: 8
Issue Number: 11
Collation: 18 Seiten
DOI: 10.26083/tuprints-00020625
Corresponding Links:
Origin: Secondary publication DeepGreen
Abstract:

Intense heavy ion beams from the Gesellschaft für Schwerionenforschung (GSI-Darmstadt) accelerator facilities are investigated for their potential to drive inertial fusion targets and are currently used to generate and probe high-energy-density (HED) matter. The existing heavy ion synchrotron facility SIS-18 delivers intense uranium beam pulses for experiments with up to 4× 10⁹ ions per bunch at a charge state of q = 73+. Higher intensities are potentially available at lower charge states, when related loss mechanisms can be overcome. We have observed intensity-dependent beam losses in SIS-18. The origin of these beam losses is attributed to processes changing the charge state of ions, which is predominantly due to collisions with rest gas atoms. The resulting change in the mass over charge ratio m/q leads to modified trajectories in dispersive beam transport elements, and finally to the loss of the particle at the vacuum tube wall. At the impact position secondary particles are produced by ion-induced desorption and as a result the pressure in the vacuum tube is increased locally. This local rise in pressure in turn leads to increased charge changing processes starting an avalanche process that may eventually lead to a complete loss of the beam during a few turns in the synchrotron. In this paper, we discuss a method to control the problem of desorbed gases with specifically designed beam catchers at critical positions. We have further developed a program package to calculate the most important beam loss mechanisms and to couple them to the dynamic vacuum problem. The basis of this simulation is an ion–optics routine where relevant atomic processes and the effects of dynamic vacuum are implemented.

Identification Number: Artikel-ID: 284
Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-206259
Classification DDC: 500 Science and mathematics > 530 Physics
Divisions: 05 Department of Physics > Institute of Nuclear Physics
Date Deposited: 13 Feb 2024 10:09
Last Modified: 17 May 2024 08:00
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/20625
PPN: 518215881
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