Abstract
Method of phase space beam dilution utilizing bounded chaos generated by rf phase modulation
Highlights
There exist numerous techniques to instigate the blowup of longitudinal beam emittance
The symplecticity of the multiparticle tracking will be used to uncover resonance structures arising from the applied phase modulation and resonant-island topographies promoting particle diffusion bounded by invariant tori
A method of phase-space beam dilution has been presented for the broadening and longitudinal uniformization of a small radiation-damped particle bunch. This is accomplished by applying phase modulation to a double rf system configured for variability in the relative phase between the two rf cavities
Summary
There exist numerous techniques to instigate the blowup of longitudinal beam emittance. Each technique is tailored to address one or a combination of the following difficulties in the handling of high-intensity beams in a storage ring: severe effects of intrabeam scattering that leads to uncontrolled transverse emittance blowup, collective instabilities, large space-charge tune shifts resulting in possible encounters with lattice resonances that will limit the performance of a machine, etc. For applications in radiation-effects experiments at Indiana University (IU), a 20-m compact electron storage ring, designed with a pair of gradient damping wiggler magnets for momentum-compaction factor variability, is currently under construction [1]. The radiation experiments require the enhancement of duty factor by broadening the electron bunch up to 40 ns in length with longitudinal particle distribution uniformity
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