• Open Access

Overtaking collision effects in a cw double-pass proton linac

Yue Tao, Ji Qiang, and Kilean Hwang
Phys. Rev. Accel. Beams 20, 124202 – Published 22 December 2017

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.

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  • Received 4 August 2017

DOI:https://doi.org/10.1103/PhysRevAccelBeams.20.124202

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Accelerators & Beams

Authors & Affiliations

Yue Tao1,2,3, Ji Qiang2,*, and Kilean Hwang2

  • 1Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
  • 2Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 3University of Chinese Academy of Sciences, Beijing 100049, China

  • *jqiang@lbl.gov

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Vol. 20, Iss. 12 — December 2017

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