RF modulation studies on an S band pulse compressor

  • An S band SLED-type pulse compressor has been manufactured by the Institute of High Energy Physics, Beijing, trying to reach 100 MW maximum input power, which means the output peak power is about 500 MW at the phase reversal time. To improve the reliability at very high power, amplitude modulation and phase modulation with flat-top output are considered, and RF modulation studies on the S-band SLED are presented in this paper. Furthermore, a method is developed using the CST Microwave Studio transient solver to simulate the time response of the pulse compressor, which can verify the modulation theory. In addition, the experimental setup was constructed and the flat-top output obtained in low power tests. Both amplitude modulation and phase modulation methods can give flat-top output, and the average power gain for both methods is almost the same.
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    [2] A. Fiebig, Ch. Schieblich, A SLED Type Pulse Compressor with Rectangular Pulse Shape, in Proceedings of the 2nd European Particle Accelerator Conference (Nice, France, 1990), p. 937-939
    [3] R. Bossart, P. Brown, J. Mourier et al, CERN CLIC-Notes, No. 592, 2004
    [4] T. Inagaki, 8-GeV C-band accelerator construction for XFEL/SPring-8, in Proceedings of the 24th Linear Accelerator Conference (Victoria, Canada, 2008), p. 1090-1094
    [5] GU Peng-Da, Studies on New RF Pulse Compressor, Ph.D. Thesis (Beijing: Institute of High Energy Physics, CAS,1999) (in Chinese)
    [6] S. Kashiwagi, H. Hayano, K. Kubo et al, Beam loading compensation using phase to amplitude modulation method in ATF, in Proceedings of the XIX International Linear Accelerator Conference(1998), p. 91-93
    [7] Microwave Studio, Computer Simulation Technology, Darmstadt, Germany. www.cst.com
    [8] Y. Joo, H. Lee, W. Hwang et al, Journal of the Korean Physical Society, 63(7) :1253-1261 (2013)
    [9] K. Shirasawa, T. Inagaki, H. Kitamura et al, High power test of c-band accelerating system for Japanese XFEL project, in Proceedings of the Asian Particle Accelerator Conference (Indore, India, 2007), p. 2095-2097
    [10] S. H. Shaker,S. R. Corsini,P. K. Skowronski et al, phase modulator programming to get flat pulses with desired length and power from the CTF3 pulse compressors, in Proceedings of the International Particle Accelerator Conference (Kyoto, Japan, 2010), p. 1425-1427
    [11] C. Serpico, M. Dal Forno, A. Fabris et al, Optimization of the SLED Phase Modulation Parameters of the FERMI Linac, in Proceedings of the North American Particle Accelerator Conference (Pasadena, USA, 2013), p. 981-983
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Guan Shu, Feng-Li Zhao, Shi-Lun Pei and Ou-Zheng Xiao. RF modulation studies on an S band pulse compressor[J]. Chinese Physics C, 2016, 40(3): 037002. doi: 10.1088/1674-1137/40/3/037002
Guan Shu, Feng-Li Zhao, Shi-Lun Pei and Ou-Zheng Xiao. RF modulation studies on an S band pulse compressor[J]. Chinese Physics C, 2016, 40(3): 037002.  doi: 10.1088/1674-1137/40/3/037002 shu
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Received: 2015-06-01
Revised: 2015-09-06
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    Supported by National Natural Science Foundation of China (11475201)

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RF modulation studies on an S band pulse compressor

  • 1. Laboratory of Particle Acceleration Physics &
  • 2. University of Chinese Academy of Sciences, Beijing 100049, China
  • 3.  Laboratory of Particle Acceleration Physics &
Fund Project:  Supported by National Natural Science Foundation of China (11475201)

Abstract: An S band SLED-type pulse compressor has been manufactured by the Institute of High Energy Physics, Beijing, trying to reach 100 MW maximum input power, which means the output peak power is about 500 MW at the phase reversal time. To improve the reliability at very high power, amplitude modulation and phase modulation with flat-top output are considered, and RF modulation studies on the S-band SLED are presented in this paper. Furthermore, a method is developed using the CST Microwave Studio transient solver to simulate the time response of the pulse compressor, which can verify the modulation theory. In addition, the experimental setup was constructed and the flat-top output obtained in low power tests. Both amplitude modulation and phase modulation methods can give flat-top output, and the average power gain for both methods is almost the same.

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