A multi-length bunch design for electron storage rings with odd buckets

Author： Liang-Jing Zhu Wei-Min Li Lin Wang Dao Xiang Xiao-Biao Huang

ISSN： 1674-1137

Source： Chinese Physics C, Vol.39, Iss.7, 2015-07, pp. : 77001-77007

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Abstract

A scheme with two superconducting RF cavities is designed to upgrade electron storage rings with odd buckets to multi-length bunches. In this paper, the Hefei Light Source II (HLS II) is given as an example for odd buckets. As it is designed for 45 buckets, which is a multiple of 3, simultaneous generation of three different lengths of bunches is proposed with the presently applied user optics. The final result, without low-α optics, is to fill HLS II with long bunches of length 50 ps, medium bunches of 23 ps and short bunches of 6 ps. Every third bucket can be filled with short bunches, of which the current limit is up to 6.6 mA, more than 60 times the limit for low-α mode. Moreover, particle tracking simulations to examine the beam dynamics, performed by ELEGANT, and calculations of the beam instabilities are presented in this paper.