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Title: Scattering effects in passive foil focusing of ion beams

Abstract

A stack of thin, closely spaced conducting foils has been investigated by Lund et al. [Phys. Rev. ST Accel. Beams 16, 044202 (2013)] as a passive focusing lens for intense ion beams. The foils mitigate space-charge defocusing forces to enable the beam self-magnetic field to focus. In this study, we analyze possible degradation of focusing due to scattering of beam ions resulting from finite foil thickness using an envelope model and numerical simulations with the particle-in-cell code WARP. Ranges of kinetic energy where scattering effects are sufficient to destroy passive focusing are quantified. The scheme may be utilized to focus protons produced in intense laser-solid accelerator schemes. The spot size of an initially collimated 30 MeV proton beam with initial rms radius 200 μm, perveance Q=1.8×10-2, and initial transverse emittance ϵx,rms=0.87 mm mrad propagating through a stack of 6.4 μm thick foils, spaced 100 μm apart, gives a 127.5 μm spot with scattering and a 81.0 μm spot without scattering, illustrating the importance of including scattering effects.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1215461
Alternate Identifier(s):
OSTI ID: 1221632; OSTI ID: 1234591
Report Number(s):
LLNL-JRNL-677120
Journal ID: ISSN 1098-4402; PRABFM; 091301
Grant/Contract Number:  
FG02-04ER41289; AC52-07NA27344
Resource Type:
Published Article
Journal Name:
Physical Review Special Topics - Accelerators and Beams
Additional Journal Information:
Journal Volume: 18; Journal Issue: 9; Journal ID: ISSN 1098-4402
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 43 PARTICLE ACCELERATORS; 70 PLASMA PHYSICS AND FUSION

Citation Formats

Yuen, Albert, Lund, Steven M., Barnard, John J., Cohen, Ronald H., and Wurtele, Jonathan S.. Scattering effects in passive foil focusing of ion beams. United States: N. p., 2015. Web. doi:10.1103/PhysRevSTAB.18.091301.
Yuen, Albert, Lund, Steven M., Barnard, John J., Cohen, Ronald H., & Wurtele, Jonathan S.. Scattering effects in passive foil focusing of ion beams. United States. https://doi.org/10.1103/PhysRevSTAB.18.091301
Yuen, Albert, Lund, Steven M., Barnard, John J., Cohen, Ronald H., and Wurtele, Jonathan S.. Fri . "Scattering effects in passive foil focusing of ion beams". United States. https://doi.org/10.1103/PhysRevSTAB.18.091301.
@article{osti_1215461,
title = {Scattering effects in passive foil focusing of ion beams},
author = {Yuen, Albert and Lund, Steven M. and Barnard, John J. and Cohen, Ronald H. and Wurtele, Jonathan S.},
abstractNote = {A stack of thin, closely spaced conducting foils has been investigated by Lund et al. [Phys. Rev. ST Accel. Beams 16, 044202 (2013)] as a passive focusing lens for intense ion beams. The foils mitigate space-charge defocusing forces to enable the beam self-magnetic field to focus. In this study, we analyze possible degradation of focusing due to scattering of beam ions resulting from finite foil thickness using an envelope model and numerical simulations with the particle-in-cell code WARP. Ranges of kinetic energy where scattering effects are sufficient to destroy passive focusing are quantified. The scheme may be utilized to focus protons produced in intense laser-solid accelerator schemes. The spot size of an initially collimated 30 MeV proton beam with initial rms radius 200 μm, perveance Q=1.8×10-2, and initial transverse emittance ϵx,rms=0.87 mm mrad propagating through a stack of 6.4 μm thick foils, spaced 100 μm apart, gives a 127.5 μm spot with scattering and a 81.0 μm spot without scattering, illustrating the importance of including scattering effects.},
doi = {10.1103/PhysRevSTAB.18.091301},
journal = {Physical Review Special Topics - Accelerators and Beams},
number = 9,
volume = 18,
place = {United States},
year = {Fri Sep 11 00:00:00 EDT 2015},
month = {Fri Sep 11 00:00:00 EDT 2015}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1103/PhysRevSTAB.18.091301

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