Abstract
The recirculating superconducting proton linac has the advantage of reducing the number of cavities in the accelerator and the corresponding construction and operational costs. Beam dynamics simulations were done recently in a double-pass recirculating proton linac using a single proton beam bunch. For continuous wave (cw) operation, the high-energy proton bunch during the second pass through the linac will overtake and collide with the low-energy bunch during the first pass at a number of locations of the linac. These collisions might cause proton bunch emittance growth and beam quality degradation. In this paper, we study the collisional effects due to Coulomb space-charge forces between the high-energy bunch and the low-energy bunch. Our results suggest that these effects on the proton beam quality would be small and might not cause significant emittance growth or beam blowup through the linac. A 10 mA, 500 MeV cw double-pass proton linac is feasible without using extra hardware for phase synchronization.
Highlights
The high-power proton linac has many applications in science and industry
Our results suggest that these effects on the proton beam quality would be small and might not cause significant emittance growth or beam blowup through the linac
The recirculating superconducting electron linac has been under operation for many years, which proves that a recirculating linac is an effective way to reduce the number of cavities and to save operational cost [6,7]
Summary
The high-power proton linac has many applications in science and industry. For example, it is being studied as a driver for a subcritical nuclear power plant [1,2,3]. It accelerates the proton beam from 150 MeV to multiple GeVs using three sections of superconducting linacs. It consists of a section of superconducting linac with 17 cavities, two arcs, and a straight beam transport line that has four bunching cavities to keep the beam longitudinally bunched. The proton bunch with higher energy during the second pass of the linac will overtake and collide with the proton bunch with lower energy during the first pass of the linac at several locations At these collision locations, in addition to the space-charge forces from the bunch itself, each bunch will be subject to the.
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