Design of a capacitive main power coupler for RF superconducting accelerators

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HE Fei-Si, HAO Jian-Kui, ZHANG Bao-Cheng and ZHAO Kui. Design of a capacitive main power coupler for RF superconducting accelerators[J]. Chinese Physics C, 2008, 32(7): 584-588. doi: 10.1088/1674-1137/32/7/015
HE Fei-Si, HAO Jian-Kui, ZHANG Bao-Cheng and ZHAO Kui. Design of a capacitive main power coupler for RF superconducting accelerators[J]. Chinese Physics C, 2008, 32(7): 584-588.  doi: 10.1088/1674-1137/32/7/015 shu
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Received: 2007-09-07
Revised: 2007-12-08
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Design of a capacitive main power coupler for RF superconducting accelerators

    Corresponding author: HE Fei-Si,

Abstract: 

An updated main coupler has been designed for the superconducting accelerator of Free Electron Laser (FEL) project under construction in Peking University. A capacitive structure is chosen for the main coupler. Numerical investigation using CST Microwave Studio demonstrates the cold window part. The other nonstandard structures such as holding rods and antenna are also optimized. The coupler uses a 95% purity Al2O3 ceramic cold window. The VSWR (Vottage Standing Wave Ratio) is 1.02 at 1.3GHz and the frequency bandwidth is 45MHz with VSWR<1.1. The electric field intensity is 8.5×10-2kV/mm around the window with 20kW Continuous Wave (CW) transmitted power. The Qext is designed variable from 5×106 to 1×107.

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