Beam-Intensity Limitations in Linear Accelerators

Jameson, Robert

doi:10.1109/tns.1981.4331708

Cited by 67 publications

(22 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This process is accompanied with emittance growth and halo formation which was a subject of detailed study of many papers (see Refs. [l], [2], [4], [6] - [lo] and cited references there). and Q is a longitudinal oscillation frequency:…”

Section: Suppression Of Beam Emittance Growth In Rf Linac Due To Rf Dmentioning

confidence: 99%

Self-consistent particle distribution of a bunched beam in RF field

Batygin

2002

Nuclear Instruments and Methods in Physics Research Section A:

View full text Add to dashboard Cite

Analytical solution for self-consistent particle equilibrium distribution in RF field with transverse focusing is found. Solution is attained in approximation of high brightness beam.Distribution function in phase space is determined as a stationary function of the energy integral.Equipartitioning for beam distribution between degrees of freedom follows directly from the choice of stationary distribution function. Analytical expressions for r-z equilibrium beam profile and maximum beam current in RF field are obtained.

show abstract

Section: Suppression Of Beam Emittance Growth In Rf Linac Due To Rf Dmentioning

confidence: 99%

Self-consistent particle distribution of a bunched beam in RF field

Batygin

2002

Nuclear Instruments and Methods in Physics Research Section A:

View full text Add to dashboard Cite

show abstract

“…The A 10 and A 30 are parametrized with the geometrical parameters of the vane tip, that is, the vane modulation factor m, the aperture radius a described at the vane tip minimal, and the cell length l c [15]. One other optional condition that characterizes the beam dynamics in LINACSrfqDES is the equipartitioning condition, used to avoid the effect of parametric resonances in high-current linacs [16]. This condition requires the internal energy in the transverse and the longitudinal phase spaces of the beam to be the same, i.e., " ln l " tn t ¼ 1:…”

Section: Designmentioning

confidence: 99%

Beam dynamics design of a new radio frequency quadrupole for beam-current upgrade of the Japan Proton Accelerator Research Complex linac

Kondo

Hasegawa

Morishita

et al. 2012

Phys. Rev. ST Accel. Beams

View full text Add to dashboard Cite

We have performed the beam-dynamics design of an H À radio frequency quadrupole (RFQ) for the beam-current upgrade of the Japan Proton Accelerator Research Complex linac (RFQ III). LINACSrfqDES was set up to support the conventional design method, i.e., design with CURLI-type shaper followed by constant bore radius and with constant intervane voltage, supplemented by keeping the equipartitioned condition in the gentle buncher section. For the particle simulation, LINACSrfqSIM was used. The obtained transmission, transverse and longitudinal emittance are 98.5%, 0:21 mm mrad, and 0:11 MeV deg for the input beam current of 60 mA and normalized rms emittance of 0:20 mm mrad. This design satisfies the requirements of RFQ III.

show abstract

“…A minimum of knobs is desired, and also an insensitivity of beam-loss performance to beam current, because tuning must be done from small current up to the full operating current. The rms equipartitioning ratio [4] ( e l n . d ) / ( e t n d ) = 1 when the beam is equipartitioned between transverse and longitudinal phase-spaces, where eln and etn are the normalized transverse and longitudinal rms emittances and a t and 01 are the phase advances with beam.…”

Section: Prevention Of Halos and Beam Lossesmentioning

confidence: 99%

“…Work in subsequent linac stages is aimed at enforcing an equipartitioned tune trajectory using the external fields and actual beam self- consistently [4]. We wish to combine this strategy with roles that resonances play in emittance growth, discussed below, to see if careful equipartitioning can minimize beam size and emittance growth.…”

Section: Equipartitioned Trajectorymentioning

confidence: 99%