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Chinese Physics C> 2005, Vol. 29> Issue(9) : 900-902 

Calculating of Coupling Factor for Double-Period Accelerating Structure

  •  Department of Engineering Physics, Tsinghua University, Beijing 100084, China

  • In the design of the linear accelerating structure, the coupling factor between cavities is a crucial parameter. The error of coupling factor accounts for the electric or magnetic field error mainly. To accurately design the coupling iris, the accurate calculation of coupling factor is essential. The numerical simulation is widely used to calculate the coupling factor now. By using MAFIA code, two methods have been applied to calculate the dispersion characteristics of the single-period structure, one method is to simulate the traveling wave mode by the period boundary condition; another method is to simulate the standing wave mode by the electrical boundary condition. In this work, we develop the two methods to calculate the coupling factor of double-period accelerating structure. Compared to experiment, the results for both methods are very similar, and in agreement with measurement within 15% deviation.
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  • References

    [1] . ZHANG Guo-Xing et al. Acta Electronica Sinica, 1997,25(6): 1(in Chinses)(张国兴等.电子学报,1997, 25(6): 1)2. ZHANG Yong et al. High Power Laser and Particle Beams,2004, 16(5): 655(in Chinses)(张勇等.强激光与粒子束,2004, 16(5):655)3. LEI Wen-Qiang et al. Journal of UEST of China, 2002,31(5): 470(in Chinses)(雷文强等.电子科技大学学报，2002, 31(5):470)4. GUI Wei-Xie. Theory of Particle Accelerators. Beijing: Tsinghua University Press, 1994(in Chinses)(桂伟燮.荷电粒子加速器原理.北京:清华大学出版社,1994)5. CST Collaboration. MAFIA help, 20006. LIU An-Dong. Master Thesis. Engineering Physics of Tsinghua University, 1980(in Chinses)(刘安东.硕士毕业论文.清华大学工程物理系,1980)

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BIAN Xiao-Hao, CHEN Huai-Bi and ZHENG Shu-Xin. Calculating of Coupling Factor for Double-Period Accelerating Structure[J]. Chinese Physics C, 2005, 29(9): 900-902.
BIAN Xiao-Hao, CHEN Huai-Bi and ZHENG Shu-Xin. Calculating of Coupling Factor for Double-Period Accelerating Structure[J]. Chinese Physics C, 2005, 29(9): 900-902. shu
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Received: 2004-11-17
Revised: 1900-01-01
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Calculating of Coupling Factor for Double-Period Accelerating Structure

    Corresponding author: BIAN Xiao-Hao,
  • Department of Engineering Physics, Tsinghua University, Beijing 100084, China
  • Received Date: 2004-11-17
  • Accepted Date: 1900-01-01
  • Available Online: 2005-09-05

Abstract: In the design of the linear accelerating structure, the coupling factor between cavities is a crucial parameter. The error of coupling factor accounts for the electric or magnetic field error mainly. To accurately design the coupling iris, the accurate calculation of coupling factor is essential. The numerical simulation is widely used to calculate the coupling factor now. By using MAFIA code, two methods have been applied to calculate the dispersion characteristics of the single-period structure, one method is to simulate the traveling wave mode by the period boundary condition; another method is to simulate the standing wave mode by the electrical boundary condition. In this work, we develop the two methods to calculate the coupling factor of double-period accelerating structure. Compared to experiment, the results for both methods are very similar, and in agreement with measurement within 15% deviation.

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