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RF design of an S-band spherical cavity pulse compressor

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Abstract

The pulse compressor plays an important role in accelerators by enhancing the RF peak power. An S-band (2856 MHz) spherical cavity pulse compressor consisting of a special 3 dB coupler and a single spherical energy storage cavity has been developed in Institute of High Energy Physics. The special 3 dB coupler converts the \(\hbox {TE}_{10}\) mode in rectangular waveguide to two polarization degenerated \(\hbox {TE}_{11}\) modes in cylindrical waveguide. It is also a circular polarizer and its general scattering matrix is given for the first time. The magnitude and the phase difference of the two \(\hbox {TE}_{11}\) modes are −3.016, −3.005 dB and 90.02\(^\circ \) in HFSS, while it is −3.01, −3.01 dB and 89.79\(^\circ \) in CST. The simulated S parameters show agreement with the general scattering matrix. The \(\hbox {TE}_{114}\) mode with an unloaded Q factor of 190,000 has been chosen to resonate in the spherical cavity. An energy multiplication factor of 1.75 and a peak power gain of 5.75 were obtained for the whole pulse compressor, which agrees with the design requirements. A good pulse compression performance is also proved by the CST time-domain simulation. In addition, the scheme for tuning and detuning is designed and given in detail. Compared to the traditional SLED type, the spherical cavity pulse compressor uses only one spherical cavity to realize the pulse compression, which makes it compact as a whole.

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Authors and Affiliations

  1. Laboratory of Particle Acceleration Physics and Technology, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China

    Jie Lei, Xiang He, Mi Hou, Guan Shu, Guo-Xi Pei, Xiao-Ping Li & Hui Wang

  2. University of Chinese Academy of Science, Beijing, 100049, China

    Jie Lei

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  1. Jie Lei
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  2. Xiang He
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  3. Mi Hou
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  4. Guan Shu
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  5. Guo-Xi Pei
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  6. Xiao-Ping Li
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  7. Hui Wang
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Correspondence to Jie Lei.

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Supported by the Youth Found of National Natural Science Foundation of China (11505199).

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Lei, J., He, X., Hou, M. et al. RF design of an S-band spherical cavity pulse compressor. Radiat Detect Technol Methods 1, 16 (2017). https://doi.org/10.1007/s41605-017-0016-0

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  • DOI: https://doi.org/10.1007/s41605-017-0016-0

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