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S-band Traveling-Wave Deflecting Structures for the PAL-XFEL

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Abstract

We designed a 20-MV S-band traveling-wave deflecting structure to measure the bunch length of the electron beams for the PAL-XFEL. Since the start of commissioning of all RF systems of the PAL-XFEL on 12 April 2016, two out of three fabricated structures are currently being operated; one each in the hard X-ray and the soft X-ray branches. These deflecting structures were carefully tuned by using a 4-m-long nodal phase scanner in a precisely temperature and humidity controlled cleanroom considering the phase predictions calculated using RF field solvers. We carried out RF conditioning and beam commissioning with highly-stable high-power S-band RF systems and an EPICS-based control system. We briefly present our design of S-band deflecting structure and discuss the test results, including the results of the RF and the beam measurements.

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Authors and Affiliations

  1. Pohang Accelerator Laboratory, Pohang, 37673, Korea

    Hoon Heo, Yong-Jung Park, Jin-Yul Hu, Sang-Hee Kim, Sung-Soo Park, Kwang-Hoon Kim, Heung-Soo Lee, Gyu-Jin Kim, Geon-Yeong Moon, Chang-Bum Kim, Dong-Hyun Na & Heung-Sik Kang

  2. Vitzrotech Co., Ltd., Ansan, 15603, Korea

    Kyung-Min Oh & Sung-Ju No

Authors
  1. Hoon Heo
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  2. Yong-Jung Park
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  3. Jin-Yul Hu
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  4. Sang-Hee Kim
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  5. Sung-Soo Park
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  6. Kwang-Hoon Kim
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  7. Heung-Soo Lee
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  8. Gyu-Jin Kim
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  9. Geon-Yeong Moon
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  10. Chang-Bum Kim
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  11. Dong-Hyun Na
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  12. Heung-Sik Kang
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  13. Kyung-Min Oh
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  14. Sung-Ju No
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Correspondence to Hoon Heo.

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Heo, H., Park, YJ., Hu, JY. et al. S-band Traveling-Wave Deflecting Structures for the PAL-XFEL. J. Korean Phys. Soc. 73, 1099–1102 (2018). https://doi.org/10.3938/jkps.73.1099

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  • DOI: https://doi.org/10.3938/jkps.73.1099

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