• Open Access

Transverse emittance growth caused by space-charge-induced resonance

Takaaki Yasui, Susumu Igarashi, Yoichi Sato, Tadashi Koseki, and Kazuhito Ohmi
Phys. Rev. Accel. Beams 23, 061001 – Published 16 June 2020

Abstract

Transverse emittance growth due to space-charge-induced resonance was studied for high-power beam operation in the J-PARC main ring synchrotron. The turn-by-turn beam sizes were measured near the structure resonance at νx=21 and near the nonstructure resonance at νx=22. A clear difference in the emittances was observed. The emittance was observed to grow by 5 times at the operating tune νx=21.10, and by 1.8 times at νx=22.05 in the first 100 turns. The results show the advantage of tuning in the region of νx=22 for high intensity beam operation. The turn-by-turn emittance varied depending on the horizontal tune in the region of νx=21. This indicates that the mechanism of emittance growth is related to the tune spread distribution. The results were satisfactorily reproduced by the simulations of the beam dynamics, including the space-charge effect incorporated via the particle-in-cell algorithm. To reveal the mechanism of the emittance growth, the space-charge effects on the resonances were evaluated by simulations as well as analytical calculations.

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  • Received 9 September 2019
  • Accepted 1 June 2020

DOI:https://doi.org/10.1103/PhysRevAccelBeams.23.061001

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

Takaaki Yasui*

  • Department of Physics, The University of Tokyo, Tokyo 113-0033, Japan

Susumu Igarashi, Yoichi Sato, Tadashi Koseki, and Kazuhito Ohmi

  • KEK, Tsukuba, Ibaraki 305-0801, Japan

  • *tyasui@post.j-parc.jp
  • Also at Department of Physics, The University of Tokyo, Tokyo, Japan.

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Vol. 23, Iss. 6 — June 2020

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