Design of a capacitive main power coupler for RF superconducting accelerators

HE Fei-Si; HAO Jian-Kui; ZHANG Bao-Cheng; ZHAO Kui

doi:10.1088/1674-1137/32/7/015

Chinese Physics C> 2008, Vol. 32> Issue(7) : 584-588 DOI: 10.1088/1674-1137/32/7/015

Design of a capacitive main power coupler for RF superconducting accelerators

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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 Q_ext is designed variable from 5×10⁶ to 1×10⁷.

References

[1]

. Garvey T. Physica C, 2006, 441: 2092. Matsumoto H, Kazacov S, Saito K. A New Design for a Super-Conducting Cavity Input Coupler. In: Horak C ed.Proceedings of the Particle Accelerator Conference. USA:Institute of Electrical and Electronics Engineers, Inc., 2005,4141-41433. ZHU Feng, QUAN Sheng-Wen, JIAO Fei et al. High Power Laser and Particle Beams, 2006, 18(4): 653 (in Chinese)4. CHU Xiang-Qiang. The Electron Beam Transportation of PKU-FEL. Beijing: Peking University, 2005 (in Chinese)5. Matsumoto H. High Power Coupler Issues in Normal Con-ducting and Superconducting Accelerator Applications. In:A. Luccio, W. MacKay ed. Proceeding of the 1999 Particle Accelerator Conference. USA: Institute of Electrical and Electronics Engineers, Inc., 1999, 536-5406. Hasan Padamsee, Jens Knobloch, Tom Hays. RF Supercon-ductivity for Accelerators. New York: John Wiley Sons,Inc., 1998. 179-197, 4157. ZHANG Ju-Xian. Journal of Vacuum Science and Technol-ogy (China), 2006, 26(1): 77 (in Chinese)8. David M Pozar. Microwave Engineering (second edition).United States of America: John Wiley Sons, Inc., 1998.56-86

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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

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Received: 2007-09-07
Revised: 2007-12-08

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沈阳化工大学材料科学与工程学院沈阳 110142

Design of a capacitive main power coupler for RF superconducting accelerators

Corresponding author: HE Fei-Si,

Received Date: 2007-09-07
Accepted Date: 2007-12-08
Available Online: 2008-07-05

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 Q_ext is designed variable from 5×10⁶ to 1×10⁷.