Suppression of Space Charge Induced Beam Halo in Nonlinear Focusing Channel
An intense nonuniform particle beam exhibits strong emittance growth and halo formation in focusing channels due to nonlinear space charge forces of the beam. This phenomenon limits beam brightness and results in particle losses. The problem is connected with irreversible distortion of phase space volume of the beam in conventional focusing structures due to filamentation in phase space. Emittance growth is accompanied by halo formation in real space, which results in inevitable particle losses. We discuss a new approach for solving a selfconsistent problem for a matched nonuniform beam in twodimensional geometry. The resulting solution is applied to the problem of beam transport, while avoiding emittance growth and halo formation by the use of nonlinear focusing field. Conservation of a beam distribution function is demonstrated analytically and by particleincell simulation for a beam with a realistic beam distribution.
 Authors:

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 Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
 Inst. of High Energy Physics, Beijing (China)
 Publication Date:
 Report Number(s):
 LAUR1520477
Journal ID: ISSN 01689002
 Grant/Contract Number:
 AC5206NA25396
 Type:
 Accepted Manuscript
 Journal Name:
 Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
 Additional Journal Information:
 Journal Volume: 816; Journal ID: ISSN 01689002
 Publisher:
 Elsevier
 Research Org:
 Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
 Sponsoring Org:
 USDOE
 Country of Publication:
 United States
 Language:
 English
 Subject:
 43 PARTICLE ACCELERATORS; Accelerator Design; Space charge; Halo; Quadrupole; Duodecapole; Emittance; Technology, and Operations
 OSTI Identifier:
 1329554
Batygin, Yuri Konstantinovich, Scheinker, Alexander, Kurennoy, Sergey, and Li, Chao. Suppression of Space Charge Induced Beam Halo in Nonlinear Focusing Channel. United States: N. p.,
Web. doi:10.1016/j.nima.2016.01.045.
Batygin, Yuri Konstantinovich, Scheinker, Alexander, Kurennoy, Sergey, & Li, Chao. Suppression of Space Charge Induced Beam Halo in Nonlinear Focusing Channel. United States. doi:10.1016/j.nima.2016.01.045.
Batygin, Yuri Konstantinovich, Scheinker, Alexander, Kurennoy, Sergey, and Li, Chao. 2016.
"Suppression of Space Charge Induced Beam Halo in Nonlinear Focusing Channel". United States.
doi:10.1016/j.nima.2016.01.045. https://www.osti.gov/servlets/purl/1329554.
@article{osti_1329554,
title = {Suppression of Space Charge Induced Beam Halo in Nonlinear Focusing Channel},
author = {Batygin, Yuri Konstantinovich and Scheinker, Alexander and Kurennoy, Sergey and Li, Chao},
abstractNote = {An intense nonuniform particle beam exhibits strong emittance growth and halo formation in focusing channels due to nonlinear space charge forces of the beam. This phenomenon limits beam brightness and results in particle losses. The problem is connected with irreversible distortion of phase space volume of the beam in conventional focusing structures due to filamentation in phase space. Emittance growth is accompanied by halo formation in real space, which results in inevitable particle losses. We discuss a new approach for solving a selfconsistent problem for a matched nonuniform beam in twodimensional geometry. The resulting solution is applied to the problem of beam transport, while avoiding emittance growth and halo formation by the use of nonlinear focusing field. Conservation of a beam distribution function is demonstrated analytically and by particleincell simulation for a beam with a realistic beam distribution.},
doi = {10.1016/j.nima.2016.01.045},
journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
number = ,
volume = 816,
place = {United States},
year = {2016},
month = {1}
}