Influence of space charge fluctuations on the low energy beam transport of high current ion beams

  • For future high current ion accelerators like SNS, ESS or IFMIF the beam behaviour in low energy beam transport sections is dominated by space charge forces. Therefore space charge fluctuations (e. g. source noise) can drastically influence the beam transport properties of the low energy beam transport section. Losses of beam ions and emittance growth are the most severe problems. For electrostatic transport systems either a LEBT design has to be found which is insensitive to variations of the space charge or the origin of the fluctuations has to be eliminated. For space charge compensated transport as proposed for ESS and IFMIF the situation is different: No major influence on beam transport is expected for fluctuations below a cut-off frequency given by the production rate of the compensation particles. Above this frequency the fluctuations can not be compensated by particle production alone, but redistributions of the compensation particles helps to compensate the influence of the fluctuations. Above a second cut-off frequency given by the density and the temperature of the compensation particles their redistribution is too slow to reduce the influence of the space charge fluctuations. Transport simulations for the IFMIF injector including space charge fluctuations will be presented together with a determination of the cut-off frequencies. The results will be compared with measurements of the rise time of space charge compensation.

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Author:Jürgen PozimskiGND, Ansgar JakobGND, Oliver MeuselGND, Andreas LakatosGND, Horst Klein
Parent Title (German):20th International Linac Conference (Linac 2000), Monterey, California, 21-25 Aug 2000
Document Type:Article
Year of Completion:2000
Year of first Publication:2000
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2005/08/12
Page Number:3
First Page:800
Last Page:802
Source:Presented at the 20th International Linac Conference (Linac 2000), Monterey, California, 21-25 Aug 2000. Published in eConfC000821:THB05,2000 Also in *Monterey 2000, Linac, vol. 2* 800-802.
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):License LogoDeutsches Urheberrecht