Design and high-power testing of offline conditioning cavity for CiADS RFQ high-power coupler

IF 3.6 1区 物理与天体物理 Q1 NUCLEAR SCIENCE & TECHNOLOGY
Ruo-Xu Wang, Yuan He, Long-Bo Shi, Chen-Xing Li, Zong-Heng Xue, Tian-Cai Jiang, Xian-Bo Xu, Lie-Peng Sun, Zhou-Li Zhang
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Abstract

To validate the design rationality of the power coupler for the RFQ cavity and minimize cavity contamination, we designed a low-loss offline conditioning cavity and conducted high-power testing. This offline cavity features two coupling ports and two tuners, operating at a frequency of \({162.5}\,\textrm{MHz}\) with a tuning range of \({3.2}\,\textrm{MHz}\). Adjusting the installation angle of the coupling ring and the insertion depth of the tuner helps minimize cavity losses. We performed electromagnetic structural and multiphysics simulations, revealing a minimal theoretical power loss of \({4.3}\,{\%}\). However, when the cavity frequency varied by \({110}\,\textrm{kHz}\), theoretical power losses increased to \({10}\,{\%}\), necessitating constant tuner adjustments during conditioning. Multiphysics simulations indicated that increased cavity temperature did not affect frequency variation. Upon completion of the offline high-power conditioning platform, we measured the transmission performance, revealing a power loss of \({6.3}\,{\%}\), exceeding the theoretical calculation. Conditioning utilized efficient automatic range scanning and standing wave resonant methods. To fully condition the power coupler, a \({15}^\circ\) phase difference between two standing wave points in the conditioning system was necessary. Notably, the maximum continuous wave power surpassed \({20}\,\textrm{kW}\), exceeding the expected target.

Abstract Image

为 CiADS RFQ 高功率耦合器设计离线调节腔并进行高功率测试
为了验证射频质量腔功率耦合器设计的合理性,并最大限度地减少腔污染,我们设计了一个低损耗离线调节腔,并进行了大功率测试。该离线腔体具有两个耦合端口和两个调谐器,工作频率为({162.5}\\textrm{MHz}\),调谐范围为({3.2}\\textrm{MHz}\)。调整耦合环的安装角度和调谐器的插入深度有助于将空腔损耗降至最低。我们进行了电磁结构和多物理场仿真,发现理论功率损耗最小为({4.3}\,{\%}\)。然而,当空腔频率变化({110}\\textrm{kHz}\)时,理论功率损耗增加到({10}\{%}\),这就要求在调节过程中不断调整调谐器。多物理场仿真表明,腔体温度的增加不会影响频率变化。离线大功率调节平台完成后,我们测量了传输性能,发现功率损耗为({6.3}/{%}),超过了理论计算值。调理利用了高效的自动范围扫描和驻波谐振方法。为了完全调节功率耦合器,调节系统中两个驻波点之间必须有({15}^/circ\ )相位差。值得注意的是,最大连续波功率超过了({20}\\textrm{kW}\),超过了预期目标。
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来源期刊
Nuclear Science and Techniques
Nuclear Science and Techniques 物理-核科学技术
CiteScore
5.10
自引率
39.30%
发文量
141
审稿时长
5 months
期刊介绍: Nuclear Science and Techniques (NST) reports scientific findings, technical advances and important results in the fields of nuclear science and techniques. The aim of this periodical is to stimulate cross-fertilization of knowledge among scientists and engineers working in the fields of nuclear research. Scope covers the following subjects: • Synchrotron radiation applications, beamline technology; • Accelerator, ray technology and applications; • Nuclear chemistry, radiochemistry, radiopharmaceuticals, nuclear medicine; • Nuclear electronics and instrumentation; • Nuclear physics and interdisciplinary research; • Nuclear energy science and engineering.
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