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High-power test of a new Bethe-hole directional coupler for the PAL XFEL S-band linac RF system

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Abstract

The directional coupler to be used in the Pohang Accelerator Laboratory X-ray free electron laser (PAL XFEL) under construction since 2011 must satisfy the conditions for operating at a peak power of 400 MW and a repetition rate of 120 Hz. In these operational conditions of the PAL XFEL, the old Bethe-hole directional coupler that was originally designed to be used in the Pohang Light Source linac is more likely to inflict damages on the ceramic window that cause vacuum leaks. Therefore, for the new Bethe-hole directional coupler, the original design has been modified to use a conventional N-type RF vacuum feedthrough for vacuum sealing instead of the ceramic window. The new Bethe-hole directional coupler is designed by using a finite-difference time-domain simulation. We have fabricated a prototype, and the result of a high-power test indicates that the RF performance of the new DC satisfies the specifications of the PAL XFEL S-band Linac RF system.

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Authors and Affiliations

  1. Pohang Accelerator Laboratory, Pohang, 790-784, Korea

    Youngdo Joo, Yongjung Park, Hoon Heo, Jinyul Hu, Sung-Soo Park, Sang-Hee Kim, Woonha Hwang, Gun-Young Moon, Sosung Lee & Heung-Soo Lee

  2. VitzroTech, Ansan, 425-833, Korea

    Sungju Noh & Kyoungmin Oh

Authors
  1. Youngdo Joo
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  2. Yongjung Park
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  3. Hoon Heo
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  4. Jinyul Hu
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  5. Sung-Soo Park
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  6. Sang-Hee Kim
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  7. Woonha Hwang
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  8. Gun-Young Moon
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  9. Sosung Lee
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  10. Heung-Soo Lee
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  11. Sungju Noh
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  12. Kyoungmin Oh
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Corresponding author

Correspondence to Youngdo Joo.

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Joo, Y., Park, Y., Heo, H. et al. High-power test of a new Bethe-hole directional coupler for the PAL XFEL S-band linac RF system. Journal of the Korean Physical Society 63, 1913–1918 (2013). https://doi.org/10.3938/jkps.63.1913

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  • DOI: https://doi.org/10.3938/jkps.63.1913

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