| A coaxial HOM coupler for a superconducting RF cavity and its low-power measurement results |
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| 作者姓名： | 孙安 唐亚哲 张力平 李英民 Han-Sung Kim |
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| 作者单位： | 1. Pohang Accelerator Laboratory, POSTECH, Pohang, Kyung-Buk 790-784, Republic of Korea;;2. College of Science and Engineering, City University of Hong Kong, Kowloon, Hong Kong, China;;3. Construction Machinery School, Chang'an University, Xi'an 710064, China;;4. PEFP, Korea Atomic Energy Research Institute, Daejeon 305-353, Republic of Korea |
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| 摘 要： | 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.
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| 关 键 词： | 射频超导 高频腔体 耦合器 测量 同轴 低功率 射频直线加速器 功耗测试 |
| 收稿时间： | 2010-6-16 |
| 修稿时间： | 2010-11-5 |
A coaxial HOM coupler for a superconducting RF cavity and its low-power measurement results |
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| Institution: | SUN An1,4;1) TANG Ya-Zhe2 ZHANG Li-Ping3 LI Ying-Min 4 Han-Sung Kim4 1 Pohang Accelerator Laboratory, POSTECH, Pohang, Kyung-Buk 790-784, Republic of Korea 2 College of Science and Engineering, City University of Hong Kong, Kowloon, Hong Kong, China 3 Construction Machinery School, Chang’an University, Xi’an 710064, China 4 PEFP, Korea Atomic Energy Research Institute, Daejeon 305-353, Republic of Korea |
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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 i... |
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| Keywords: | superconducting RF accelerator higher-order mode (HOM) HOM damping coaxial HOM coupler HOM coupler design |
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