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Design study of a new SLED system with a biplanar 3-dB power divider and dual side-wall coupling-irises for the PAL XFEL

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Abstract

The Stanford Linear Accelerator Energy Doubler (SLED) system for the PAL (Pohang Accelerator Laboratory) XFEL (X-ray Free Electron Laser) is required to operate with an RF input power of 80 MW and a pulse width of 4 µs. Due to the high radiation dose from RF breakdown at coupling holes and power dividers in such a high-power operation, a modification of the original SLED system is called for. We designed a new SLED system with a biplanar 3-dB power divider and dual side-wall coupling-irises by using a finite-difference time-domain (FDTD) simulation. The new SLED system proved to be a good solution that reduced the probability of RF breakdown in high-powered operations due to the reduced field gradient and surface current. In addition, a time-domain simulation was carried out to estimate the performance of new SLED system and to study the process for the question of the SLED output waveform.

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Authors and Affiliations

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

    Youngdo Joo, Heung-Soo Lee, Woonha Hwang, Youngjung Park, Kyoungmin Oh & Byung-Joon Lee

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  1. Youngdo Joo
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  2. Heung-Soo Lee
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  3. Woonha Hwang
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  4. Youngjung Park
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  5. Kyoungmin Oh
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  6. Byung-Joon Lee
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Correspondence to Youngdo Joo.

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Joo, Y., Lee, HS., Hwang, W. et al. Design study of a new SLED system with a biplanar 3-dB power divider and dual side-wall coupling-irises for the PAL XFEL. Journal of the Korean Physical Society 63, 1253–1261 (2013). https://doi.org/10.3938/jkps.63.1253

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  • DOI: https://doi.org/10.3938/jkps.63.1253

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