The Effect of Induced Charge at Boundaries on Transverse Dynamics of a Space-Charge-Dominated Beam

A particle simulation code has been used to study the effect on transverse beam dynamics of charge induced on focusing electrodes. A linear transport system was assumed. The initial particle distribution was taken to be that of a uniform elliptical beam with a Gaussian velocity distribution. For mis...

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Bibliographic Details
Published in:IEEE transactions on nuclear science 1985-10, Vol.32 (5), p.2480-2482
Main Authors: Celata, C. M., Haber, I., Laslett, L. J., Smith, L., Tiefenback, M. G.
Format: Article
Language:English
Subjects:
Computational modeling
Computer simulation
Electrodes
Electrostatics
Focusing
Lattices
Motion analysis
Particle beams
Solid modeling
Temperature distribution
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Summary:A particle simulation code has been used to study the effect on transverse beam dynamics of charge induced on focusing electrodes. A linear transport system was assumed. The initial particle distribution was taken to be that of a uniform elliptical beam with a Gaussian velocity distribution. For misaligned, highly space-charge-dominated beams (betatron phase advance per lattice period ≲ 10°), a large oscillation of the rms emittance occurred in a beat pattern. Linearized Vlasov analysis shows the oscillation to be a sextupole oscillation, driven by the beam coherent betatron motion. Emittance growth accompanied the oscillation. Preliminary experimental results from the Single Beam Transport Experiment (SBTE) are consistent with the code results. Addition of a dodecapole nonlinearity to the computational focusing field greatly reduces the oscillation amplitude.
ISSN:0018-9499
1558-1578
DOI:10.1109/TNS.1985.4333953