Design and vertical tests of double-quarter wave cavity prototypes for the high-luminosity LHC crab cavity system
Design and vertical tests of double-quarter wave cavity prototypes for the high-luminosity LHC crab cavity system
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高光度LHC蟹腔系统双四分之一波腔原型设计与垂直测试
DOI：
10.1103/physrevaccelbeams.21.082002
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发表时间：
2018
影响因子：
1.7
通讯作者：
Verdú-Andrés S
中科院分区：
文献类型：
--
作者：
Verdú-Andrés S
蟹状交叉对于高光度对撞机是必不可少的。高亮度大型强子对撞机（HL-LHC）将在其相互作用点（IP 1）上配备双四分之一波（DQW）蟹腔。DQW腔是新一代的偏转射频腔，其紧凑性和基模与第一高阶模之间的宽频率间隔脱颖而出。偏转反冲由其基本模式提供。每个HL-LHC DQW腔应提供3.4 MV的标称偏转电压，尽管可能需要高达5.0 MV。原理验证（POP）DQW腔受到4.6 MV失超的限制。本文介绍了一种新的，高度优化的腔，指定的DQW SPS系列，它满足尺寸，低温，制造和阻抗的要求束测试在超级质子同步加速器（SPS）和操作中的LHC。该DQW SPS系列的两个原型由美国工业制造，并在经过传统的超导射频表面处理后进行冷测试。这两个单位优于POP腔，达到5.3-5.9 MV的偏转电压。该电压（DQW腔达到的最高电压）远远超出了3.4 MV的标称电压，甚至可以在5.0 MV的极限电压下工作，并有足够的裕度。本文包括制造，表面准备，低温射频测试结果和影响。
Crab crossing is essential for high-luminosity colliders. The high-luminosity Large Hadron Collider (HL-LHC) will equip one of its interaction points (IP1) with double-quarter wave (DQW) crab cavities. A DQW cavity is a new generation of deflecting rf cavities that stands out for its compactness and broad frequency separation between fundamental and first high-order modes. The deflecting kick is provided by its fundamental mode. Each HL-LHC DQW cavity shall provide a nominal deflecting voltage of 3.4 MV, although up to 5.0 MV may be required. A proof-of-principle (POP) DQW cavity was limited by quench at 4.6 MV. This paper describes a new, highly optimized cavity, designated the DQW SPS series, which satisfies dimensional, cryogenic, manufacturing, and impedance requirements for beam tests at the Super Proton Synchrotron (SPS) and operation in the LHC. Two prototypes of this DQW SPS series were fabricated by U.S. industry and cold tested after following a conventional superconducting radio-frequency surface treatment. Both units outperformed the POP cavity, reaching a deflecting voltage of 5.3–5.9 MV. This voltage—the highest reached by a DQW cavity—is well beyond the nominal voltage of 3.4 MV and may even operate at the ultimate voltage of 5.0 MV with a sufficient margin. This paper covers fabrication, surface preparation, and cryogenic rf test results and implications.
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DOI：
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