Comparison of particle-in-cell simulation with experiment for the transport system of the superconducting electron cyclotron resonance ion source VENUS

The three-dimensional, particle-in-cell code WARP has been enhanced to allow end-to-end beam dynamics simulations of the VENUS beam transport system from the extraction region, through a mass-analyzing magnet, and up to a two-axis emittance scanner. This article presents the first results of compari...

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Bibliographic Details
Published in:Review of scientific instruments 2006-03, Vol.77 (3)
Main Authors: Todd, D. S., Leitner, D., Leitner, M., Lyneis, C. M., Qiang, J., Grote, D. P.
Format: Article
Language:English
Subjects:
BEAM DYNAMICS
BEAM TRANSPORT
COMPARATIVE EVALUATIONS
CURRENT DENSITY
ECR ION SOURCES
HELIUM IONS
MAGNETIC CONFINEMENT
MAGNETS
MASS SPECTRA
PARTICLE ACCELERATORS
PARTICLE BEAMS
PHASE SPACE
SIMULATION
SPACE CHARGE
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Summary:The three-dimensional, particle-in-cell code WARP has been enhanced to allow end-to-end beam dynamics simulations of the VENUS beam transport system from the extraction region, through a mass-analyzing magnet, and up to a two-axis emittance scanner. This article presents the first results of comparisons between the simulation and experimental data. A helium beam (He+ and He2+) is chosen as an initial comparison beam due to its simple mass spectrum. Although a number of simplifications are made for the initial extracted beam, aberration characteristics appear in simulations that are also present in experimental phase-space current-density measurements. Further, measurements of phase-space tilt indicate that simulations must have little or no space-charge neutralization along the transport system to best agree with experiment. In addition, recent measurements of triangular beam structure immediately after the source are presented. This beam structure is related to the source magnetic confinement fields and will need to be taken into account as the initial beam approximations are lifted.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.2166677