Design of a capacitive main power coupler for RF superconducting accelerators  

作　　者：贺斐思 郝建奎 张保澄 赵夔 

机构地区：[1]State Key Laboratory of Nuclear Physics and Technology,Peking University,Beijing 100871,China

出　　处：《Chinese Physics C》2008年第7期584-588,共5页中国物理C（英文版）

基　　金：Supported by National Basic Research Program(2002CB713600);NSFC(10775010)

摘　　要：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 1.3 GHz and the frequency bandwidth is 45 MHz with VSWR〈I.1. The electric field intensity is 8.5× 10-2 kV/mm around the window with 20 kW Continuous Wave （CW） transmitted power. The Qext is designed variable from 5× 10^8 to 1×10^7.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 1.3 GHz and the frequency bandwidth is 45 MHz with VSWR〈I.1. The electric field intensity is 8.5× 10-2 kV/mm around the window with 20 kW Continuous Wave （CW） transmitted power. The Qext is designed variable from 5× 10^8 to 1×10^7.

关 键 词：COUPLER capacitive coupling cold window coaxial line PKU FEL 

分 类 号：TL503[核科学技术—核技术及应用]