Wake Field Calculation Studies in Constant Gradient Accelerating Structures

PEI Shi-Lun; WANG Shu-Hong

Chinese Physics C> 2006, Vol. 30> Issue(3) : 251-259

Wake Field Calculation Studies in Constant Gradient Accelerating Structures

PEI Shi-Lun ^, ,
WANG Shu-Hong

Institute of High Energy Physics, CAS, Beijing 100049, China2 Graduate School of the Chinese Academy of Sciences, Beijing 100049, China

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Abstract：
When charged particle beams traverse in an accelerating structure, the excited wake fields may dilute the beam energy spread and emittance. In order to estimate the wake field effects on the beam dynamics properly, it is very important to calculate the wake fields precisely. In this paper, the calculation methods of the short range, middle long range and super long range wake fields in constant gradient structures are systematically studied, and the expression of the super long range longitudinal wake field is first given. In addition, the wake fields for the BEPCⅡ Linac's disk-loaded structures are calculated by using analytical methods and various computer codes, the consistency and some deviations of the results obtained by different calculation methods are also discussed.

References

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. Chin Y H. User's Guide for ABCI (Version 8.7): CERNSL/94-02 (AP). Geneva, Swizerland, 19942. The MAFIA Collaboration. MAFIA User Manual (Version4.106). Germany: CST Inc, 20003. Takao M et al. Evaluation of Wake Fields of Disk Loaded Structure for JLC: KEK Report 91-4. 19914. XIAO Li-Ling. R D of Accelerating Structure for NLC.Postdoctor Thesis, Tsinghua University, 1995.11 (in Chinese)(肖利等.下一代LC加速结构的研究进展.博士后出站报告,清华大学,1995.11)5. GAO Jie. NIM, 2000, A447: 301—3086. JIN C. Group Velocity Effect on Wakefield Calculation:WF-222. ANL, 20047. Chao A. Physics of Collective Beam Instabilities in High Energy Accelerators. New York: Wiley Interscience. 19938. Bane K. Short-Range Dipole Wakefields in Accelerating Structures for the NLC: SLAC-PUB-9663. SLAC, 20039. Gluckstern R L. Phys. Rev., 1989, D39: 2780—278310. Bane K et al. Measurement of the Longitudinal Wakefield in the SLAC Linac for Extremely Short Bunches: SLAC-PUB-9905. 200311. Weiland T. NIM, 1983, 212: 13—2112. Bane K et al. Proceedings of the 11th Int. Conf. on High Energy Accelerators. CERN, 1980. 58113. Keil E. NIM, 1972, 100: 41914. The Ansoft High Frequency Structure Simulator. Copyright An soft Corporation15. GU Peng-Da. Studies on New RF Pulse Compressor. PhDThesis, IHEP, 1999(in Chinese)(顾鹏达.新型RF脉冲压缩器研究.博士论文,中国科学院高能物理研究所,1999)

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PEI Shi-Lun and WANG Shu-Hong. Wake Field Calculation Studies in Constant Gradient Accelerating Structures[J]. Chinese Physics C, 2006, 30(3): 251-259.

PEI Shi-Lun and WANG Shu-Hong. Wake Field Calculation Studies in Constant Gradient Accelerating Structures[J]. Chinese Physics C, 2006, 30(3): 251-259. shu

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Received: 2005-06-16
Revised: 2005-10-12

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沈阳化工大学材料科学与工程学院沈阳 110142

Wake Field Calculation Studies in Constant Gradient Accelerating Structures

PEI Shi-Lun ^,
WANG Shu-Hong

Corresponding author: PEI Shi-Lun,

Institute of High Energy Physics, CAS, Beijing 100049, China2 Graduate School of the Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2005-06-16
Accepted Date: 2005-10-12
Available Online: 2006-03-05

Abstract: When charged particle beams traverse in an accelerating structure, the excited wake fields may dilute the beam energy spread and emittance. In order to estimate the wake field effects on the beam dynamics properly, it is very important to calculate the wake fields precisely. In this paper, the calculation methods of the short range, middle long range and super long range wake fields in constant gradient structures are systematically studied, and the expression of the super long range longitudinal wake field is first given. In addition, the wake fields for the BEPCⅡ Linac's disk-loaded structures are calculated by using analytical methods and various computer codes, the consistency and some deviations of the results obtained by different calculation methods are also discussed.