A multi-length bunch design for electron storage ringswith odd buckets |
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作者姓名: | 朱亮静 李为民 王琳 向导 黄小彪 |
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作者单位: | 1 National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230026, China;;2 SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA;;3 Key Laboratory for Laser Plasmas (Ministry of Education), Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China |
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摘 要: | 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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关 键 词: | storage ring bunch length odd buckets superconducting cavities HLS |
收稿时间: | 2014-9-11 |
修稿时间: | 2015-2-17 |
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