Abstract
There has been much research on longitudinal bunch splitting and coalescing for accelerator performance improvements in rf synchrotrons. In this paper, we report a scheme with several induction cells that goes beyond the limitation in which the phase drift speed of beam buckets must be much lower than that of the maximum off-momentum particles to minimize longitudinal emittance blowup. In principle, additional pulse acceleration voltages can be applied to produce a momentum jump of the beam and save beam manipulation time, which is crucial for fast-cycling synchrotrons with limited injection and extraction times. This paper compares the new and conventional schemes with experimental results. Finally, the beam behaviors are discussed with macroparticle simulations.
Highlights
Longitudinal beam manipulation schemes in synchrotrons have been traditionally called rf gymnastics
Rf gymnastics can be achieved by a method called barrierbucket handling, which uses isolated acceleration pulses with wideband rf cavities
We have demonstrated longitudinal bunch splitting and coalescing with an off-momentum drifting barrier-bucket scheme (offDBB) in the induction synchrotron
Summary
Longitudinal beam manipulation schemes in synchrotrons have been traditionally called rf gymnastics. In which longitudinal beam relocation is achieved through an off-momentum drifting barrier-bucket scheme (offDBB), is described in Sec. IV-d-iii of Ref. Typical longitudinal beam splitting and coalescing schemes intrinsically include beam relocation with on-momentum moving buckets. We refer to these wellestablished schemes as on-momentum drifting barrierbucket schemes (onDBB). Adiabatic beam handling, where the speed of the drifting beam bucket is much lower than the phase drift speed of the maximum off-momentum particles in the longitudinal phase space, effectively avoids emittance blowup. Beam loss minimization is crucial even at low energies (∼50 keV=nucleon) to prevent metal ion beams from being deposited on the surface of electrical insulators such as ceramics To meet these demands, a bucket is instantaneously shifted to an off-momentum position in the longitudinal phase space. The results are summarized with future perspectives in the final section
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