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Title: Overtaking collision effects in a cw double-pass proton linac

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. Here, 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.

Authors:
 [1];  [2];  [2]
  1. Chinese Academy of Sciences (CAS), Lanzhou (China). Inst. of Modern Physics; Univ. of Chinese Academy of Sciences, Beijing (China); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Org.:
USDOE Office of Science (SC); China Scholarship Council
OSTI Identifier:
1414630
Alternate Identifier(s):
OSTI ID: 1432236
Grant/Contract Number:  
AC02-05CH11231; 201604910803
Resource Type:
Journal Article: Published Article
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Volume: 20; Journal Issue: 12; Related Information: © 2017 authors. Published by the American Physical Society.; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 43 PARTICLE ACCELERATORS; low-energy multiple-particle dynamics

Citation Formats

Tao, Yue, Qiang, Ji, and Hwang, Kilean. Overtaking collision effects in a cw double-pass proton linac. United States: N. p., 2017. Web. doi:10.1103/PhysRevAccelBeams.20.124202.
Tao, Yue, Qiang, Ji, & Hwang, Kilean. Overtaking collision effects in a cw double-pass proton linac. United States. doi:10.1103/PhysRevAccelBeams.20.124202.
Tao, Yue, Qiang, Ji, and Hwang, Kilean. Fri . "Overtaking collision effects in a cw double-pass proton linac". United States. doi:10.1103/PhysRevAccelBeams.20.124202.
@article{osti_1414630,
title = {Overtaking collision effects in a cw double-pass proton linac},
author = {Tao, Yue and Qiang, Ji and Hwang, Kilean},
abstractNote = {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. Here, 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.},
doi = {10.1103/PhysRevAccelBeams.20.124202},
journal = {Physical Review Accelerators and Beams},
number = 12,
volume = 20,
place = {United States},
year = {Fri Dec 22 00:00:00 EST 2017},
month = {Fri Dec 22 00:00:00 EST 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevAccelBeams.20.124202

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