A multi-length bunch design for electron storage ringswith odd buckets

HU Liang-Jing; LI Wei-Min; WANG Lin; XIANG Dao; HUANG Xiao-Biao

doi:10.1088/1674-1137/39/7/077001

Chinese Physics C> 2015, Vol. 39> Issue(7) : 077001 DOI: 10.1088/1674-1137/39/7/077001

A multi-length bunch design for electron storage ringswith odd buckets

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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.

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HU Liang-Jing, LI Wei-Min, WANG Lin, XIANG Dao and HUANG Xiao-Biao. A multi-length bunch design for electron storage ringswith odd buckets[J]. Chinese Physics C, 2015, 39(7): 077001. doi: 10.1088/1674-1137/39/7/077001

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Received: 2014-09-11
Revised: 2015-02-17

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沈阳化工大学材料科学与工程学院沈阳 110142

A multi-length bunch design for electron storage ringswith odd buckets

Corresponding author: HU Liang-Jing,

Corresponding author: LI Wei-Min,

Received Date: 2014-09-11
Accepted Date: 2015-02-17
Available Online: 2015-07-05

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.