Control of beam halo formation through nonlinear damping and collimation
This paper demonstrates that transverse beam halos can be controlled by combining nonlinear focusing and collimation. The study relies on one-dimensional, constant focusing particle-in-cell (PIC) simulations and a particle-core model. Beams with linear and nonlinear focusing are studied. Calculation...
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American Physical Society
2005-06-01
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Series: | Physical Review Special Topics. Accelerators and Beams |
Online Access: | http://doi.org/10.1103/PhysRevSTAB.8.064202 |
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doaj-fa506539fe9645fe8c4c6f0f709eb1c52020-11-25T00:53:40ZengAmerican Physical SocietyPhysical Review Special Topics. Accelerators and Beams1098-44022005-06-018606420210.1103/PhysRevSTAB.8.064202Control of beam halo formation through nonlinear damping and collimationKiran G. SonnadJohn R. CaryThis paper demonstrates that transverse beam halos can be controlled by combining nonlinear focusing and collimation. The study relies on one-dimensional, constant focusing particle-in-cell (PIC) simulations and a particle-core model. Beams with linear and nonlinear focusing are studied. Calculations with linear focusing confirm previous findings that the extent and density of the halo depend strongly upon the initial mismatch of the beam. Calculations with nonlinear focusing are used to study damping in the beam oscillations caused by the mismatch. Although the nonlinear force damps the beam oscillations, it is accompanied by emittance growth. This process is very rapid and happens within the first 2–3 envelope oscillations. After this, when the halo is collimated using a system of four collimators, further evolution of the beam shows that the halo is not regenerated. The elimination of the beam halo could allow either a smaller physical aperture for the transport system or it could allow a beam of higher current in a system with the same physical aperture. This advantage compensates for the loss of particles due to collimation.http://doi.org/10.1103/PhysRevSTAB.8.064202 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Kiran G. Sonnad John R. Cary |
spellingShingle |
Kiran G. Sonnad John R. Cary Control of beam halo formation through nonlinear damping and collimation Physical Review Special Topics. Accelerators and Beams |
author_facet |
Kiran G. Sonnad John R. Cary |
author_sort |
Kiran G. Sonnad |
title |
Control of beam halo formation through nonlinear damping and collimation |
title_short |
Control of beam halo formation through nonlinear damping and collimation |
title_full |
Control of beam halo formation through nonlinear damping and collimation |
title_fullStr |
Control of beam halo formation through nonlinear damping and collimation |
title_full_unstemmed |
Control of beam halo formation through nonlinear damping and collimation |
title_sort |
control of beam halo formation through nonlinear damping and collimation |
publisher |
American Physical Society |
series |
Physical Review Special Topics. Accelerators and Beams |
issn |
1098-4402 |
publishDate |
2005-06-01 |
description |
This paper demonstrates that transverse beam halos can be controlled by combining nonlinear focusing and collimation. The study relies on one-dimensional, constant focusing particle-in-cell (PIC) simulations and a particle-core model. Beams with linear and nonlinear focusing are studied. Calculations with linear focusing confirm previous findings that the extent and density of the halo depend strongly upon the initial mismatch of the beam. Calculations with nonlinear focusing are used to study damping in the beam oscillations caused by the mismatch. Although the nonlinear force damps the beam oscillations, it is accompanied by emittance growth. This process is very rapid and happens within the first 2–3 envelope oscillations. After this, when the halo is collimated using a system of four collimators, further evolution of the beam shows that the halo is not regenerated. The elimination of the beam halo could allow either a smaller physical aperture for the transport system or it could allow a beam of higher current in a system with the same physical aperture. This advantage compensates for the loss of particles due to collimation. |
url |
http://doi.org/10.1103/PhysRevSTAB.8.064202 |
work_keys_str_mv |
AT kirangsonnad controlofbeamhaloformationthroughnonlineardampingandcollimation AT johnrcary controlofbeamhaloformationthroughnonlineardampingandcollimation |
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