A coaxial HOM coupler for a superconducting RF cavity and its low-power measurement results

SUN An; TANG Ya-Zhe; ZHANG Li-Ping; LI Ying-Min; Sung Kim

doi:10.1088/1674-1137/35/3/017

Chinese Physics C> 2011, Vol. 35> Issue(3) : 301-307 DOI: 10.1088/1674-1137/35/3/017

A coaxial HOM coupler for a superconducting RF cavity and its low-power measurement results

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Abstract：
A resonant buildup of beam-induced fields in a superconducting radio frequency (RF) cavity may make a beam unstable or a superconducting RF cavity quench. Higher-order mode (HOM) couplers are used for damping higher-order modes to avoid such a resonant buildup. A coaxial HOM coupler based on the TTF (TESLA Test Facility) HOM coupler has been designed for the superconducting RF cavities at the Proton Engineering Frontier Project (PEFP) in order to overcome notch frequency shift and feed-through tip melting issues. In order to confirm the HOM coupler design and finalize its structural dimensions, two prototype HOM couplers have been fabricated and tested. Low-power testing and measurement of the HOM couplers has shown that the HOM coupler has good filter properties and can fully meet the damping requirements of the PEFP low-beta superconducting RF linac.

References

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Alonso J R. Rev. Sci. Instrum., 1996, 67: 13082 SUN An, Joo Y D, Kang H S. J. Korean Phys. Soc., 2010, 56: 20243 Gebel R, Felden O, Von Rossen P. Rev. Sci. Instrum., 2004, 75: 18604 Kim J W, Goto A, Yano Y. Rev. Sci. Instrum., 1999, 70: 22935 Benaroya R, Shepard K W. Rev. Sci. Instrum., 1988, 59: 21006 Kim S H, Doleans M, Jeon D O, Sundelin R. Nucl. Instrum. Methods A, 2002, 492: 17 Padamsee H, Knobloch J, Hays T. RF Superconductivity for Accelerators. New York: John Wiley Sons, 1998. 3358 Kim S H et al. Study on Fault Scenarios of Coaxial Type HOM Couplers in SRF Cavities. In: Proceedings of LINAC 2006. Knoxville, USA: JACoW, 2006. 7709 Kim S H J. Korean Phys. Soc., 2008, 52: 71410 Henderson S. Commissioning and Initial Operating Experi-ence with the SNS 1-GeV Linac. In: Proceedings of LINAC 2006. Knoxville, USA: JACoW, 2006. 111 ZHANG Li-Ping, SUN An, LI Yin-Min, TANG Ya-Zhe, Cho Y S. J. Korean Phys. Soc., 2009, 54: 202512 SUN An, ZHANG Li-Ping, TANG Ya-Zhe, LI Ying-Min, GAO Chang-Yi, Cho Y S. PEFP Dumbbell Frequency and Length tuning of a Low-beta SRF Cavity. In: Proceedings of EPAC 2008. Genoa, Italy: JACoW, 2008. 82313 SUN An, Kim H S, Cho Y S, Choi B H. J. Korean Phys. Soc., 2008, 52: 79314 SUN An, Cho Y S, Choi B H. Design of the PEFP Low Beta Cryomodule. In: Proceedings of APAC 2007. Indore, India: JACoW, 2007. 56415 SUN An, ZHANG Li-Ping, TANG Ya-Zhe, LI Ying-Min, Cho Y S. Rev. Sci. Instrum., 2008, 79: 10470116 SUN An, Cho Y S, Choi B H, Jang J H. J. Korean Phys. Soc., 2007, 50: 142117 Ciovati G et al. Superconducting Prototype Cavities for the Spallation Neutron Source (SNS) Project. In: Proceedings of PAC 2001. Chicago: JACoW, 2001. 48418 CST MICROWAVE STUDIO Version 5 Getting Started, Nov. 2003. CST-Computer Simulation Technology19 SUN An, ZHANG Li-Ping, TANG Ya-Zhe, LI Ying-Min, GAO Chang-Yi, Cho Y S, Choi B H. PEFP Dumbbell Fre-quency and Length Tuning of a Low-beta SRF Cavity. In: Proceedings of EPAC 2008. Genoa, Italy: JACoW, 2008. 82020 Pozar D. Microwave Engineering (Second edition). New York: John Wiley Sons, 1998. 333

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SUN An, TANG Ya-Zhe, ZHANG Li-Ping, LI Ying-Min and Sung Kim. A coaxial HOM coupler for a superconducting RF cavity and its low-power measurement results[J]. Chinese Physics C, 2011, 35(3): 301-307. doi: 10.1088/1674-1137/35/3/017

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Received: 2010-06-16
Revised: 2010-11-05

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沈阳化工大学材料科学与工程学院沈阳 110142

A coaxial HOM coupler for a superconducting RF cavity and its low-power measurement results

Received Date: 2010-06-16
Accepted Date: 2010-11-05
Available Online: 2011-03-05

Abstract: A resonant buildup of beam-induced fields in a superconducting radio frequency (RF) cavity may make a beam unstable or a superconducting RF cavity quench. Higher-order mode (HOM) couplers are used for damping higher-order modes to avoid such a resonant buildup. A coaxial HOM coupler based on the TTF (TESLA Test Facility) HOM coupler has been designed for the superconducting RF cavities at the Proton Engineering Frontier Project (PEFP) in order to overcome notch frequency shift and feed-through tip melting issues. In order to confirm the HOM coupler design and finalize its structural dimensions, two prototype HOM couplers have been fabricated and tested. Low-power testing and measurement of the HOM couplers has shown that the HOM coupler has good filter properties and can fully meet the damping requirements of the PEFP low-beta superconducting RF linac.