• Open Access

Cross-wake force and correlated head-tail instability in beam-beam collisions with a large crossing angle

Nami Kuroo, Kazuhito Ohmi, Katsunobu Oide, Demin Zhou, and Frank Zimmermann
Phys. Rev. Accel. Beams 21, 031002 – Published 15 March 2018

Abstract

This paper discusses novel coherent beam-beam instability in collisions with a large crossing angle. The instability appears in the correlated head-tail motion of two colliding beams. A cross-wake force, which is localized at the collision point, is introduced to represent the head-tail correlation between colliding beams. A mode-coupling theory based on this localized cross-wake force enables us to explain the correlated heal-tail instability. The use of a collision scheme with a large crossing angle is becoming popular in the design of electron–positron colliders. An example thereof is the SuperKEKB project, in which a collision with a large crossing angle is performed to boost the luminosity to 0.8×1036cm2s1. Future circular colliders will also be designed with a large crossing angle. Strong-strong simulations, which have shown the first coherent head-tail instability, can limit the performance of proposed future colliders. The mechanism whereby this instability occurs is mode coupling due to the cross-wake force. This instability may affect all collider designs based on the crab waist scheme.

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  • Received 5 January 2018

DOI:https://doi.org/10.1103/PhysRevAccelBeams.21.031002

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)

  1. Research Areas
Accelerators & Beams

Authors & Affiliations

Nami Kuroo1,3, Kazuhito Ohmi1,*, Katsunobu Oide1,2, Demin Zhou1,2, and Frank Zimmermann2

  • 1KEK, Tsukuba, Ibaraki 305-0801, Japan
  • 2CERN, 1211 Geneva 23, Switzerland
  • 3University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan

  • *Corresponding author. ohmi@post.kek.jp

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Vol. 21, Iss. 3 — March 2018

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