{"title":"Design and high-power testing of offline conditioning cavity for CiADS RFQ high-power coupler","authors":"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","doi":"10.1007/s41365-024-01496-0","DOIUrl":null,"url":null,"abstract":"<p>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 <span>\\({162.5}\\,\\textrm{MHz}\\)</span> with a tuning range of <span>\\({3.2}\\,\\textrm{MHz}\\)</span>. 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 <span>\\({4.3}\\,{\\%}\\)</span>. However, when the cavity frequency varied by <span>\\({110}\\,\\textrm{kHz}\\)</span>, theoretical power losses increased to <span>\\({10}\\,{\\%}\\)</span>, 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 <span>\\({6.3}\\,{\\%}\\)</span>, exceeding the theoretical calculation. Conditioning utilized efficient automatic range scanning and standing wave resonant methods. To fully condition the power coupler, a <span>\\({15}^\\circ\\)</span> phase difference between two standing wave points in the conditioning system was necessary. Notably, the maximum continuous wave power surpassed <span>\\({20}\\,\\textrm{kW}\\)</span>, exceeding the expected target.</p>","PeriodicalId":19177,"journal":{"name":"Nuclear Science and Techniques","volume":null,"pages":null},"PeriodicalIF":3.6000,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Nuclear Science and Techniques","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1007/s41365-024-01496-0","RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"NUCLEAR SCIENCE & TECHNOLOGY","Score":null,"Total":0}
引用次数: 0
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.
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.