Development of a DC bias structure with reduced RF leakage for suppressing the multipacting effect in the high power coaxial couplers

doi:10.1016/j.nima.2020.164891

	Development of a DC bias structure with reduced RF leakage for suppressing the multipacting effect in the high power coaxial couplers
	Lin, Zeqiang 2,3; Jiang, Tiancai 2; Huang, Shichun 2; Huang, Yulu 2; Gao, Zheng 2; Wang, Ruoxu 2; Xue, Zongheng 2; Yang, Ziqin 2; Li, Chunlong 2; Lu, Ming 2,3
刊名	NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
	2021-02-01
卷号	988 页码:8
关键词	Power coupler RF leakage DC Bias Blocking effect Equivalent circuits
ISSN号	0168-9002
DOI	10.1016/j.nima.2020.164891
通讯作者	Jiang, Tiancai(jiangtiancai@impcas.ac.cn) ; He, Yuan(hey@impcas.ac.cn)
英文摘要	Coaxial power couplers are being employed for RF power transmission to the low beta superconducting cavities used for proton beam acceleration in the 25 MeV superconducting linear accelerator (linac) demonstration facility of the China Initiative Accelerator Driven System (CiADS) project. However, the operation stability of the coaxial couplers was mainly limited by the multipacting effect, which can be suppressed by applying DC bias voltage between the inner and the outer conductors. In this paper, we found an RF leakage problem that the electromagnetic (EM) field inside the couplers can penetrate the bias capacitor and then propagate along the DC bias cable, thus disturbing the stability of the DC power supply and finally disabling the RF system. Therefore, a simple DC bias "T" transition part has been developed, where the series resistors are introduced to reduce the electromagnetic field propagating along the cable and make the structure intensely stable. The test results indicate that the blocking effect of the resistive solution is better than that of the conventional inductive method. The equivalent circuits of the resistive structure and the inductive structure are established and analyzed. The detailed test and analysis results of the new DC bias structure will be reported.
资助项目	Major Research Plan of National Natural Science Foundation of China[91426303] ; West Light Talent Program of the Chinese Academy of Sciences[29Y936020] ; Youth Innovation Promotion Association of Chinese Academy of Sciences[2020410]
WOS研究方向	Instruments & Instrumentation ; Nuclear Science & Technology ; Physics
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000604627900003
资助机构	Major Research Plan of National Natural Science Foundation of China ; West Light Talent Program of the Chinese Academy of Sciences ; Youth Innovation Promotion Association of Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/138190]
专题	中国科学院近代物理研究所
通讯作者	Jiang, Tiancai; He, Yuan
作者单位	1.GLVAC Ind Technol Res Inst High Power Devices, Kunshan 215300, Peoples R China 2.Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China 3.Univ Chinese Acad Sci, Sch Nucl Sci & Technol, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Lin, Zeqiang,Jiang, Tiancai,Huang, Shichun,et al. Development of a DC bias structure with reduced RF leakage for suppressing the multipacting effect in the high power coaxial couplers[J]. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT,2021,988:8.
APA	Lin, Zeqiang.,Jiang, Tiancai.,Huang, Shichun.,Huang, Yulu.,Gao, Zheng.,...&Li, Yongming.(2021).Development of a DC bias structure with reduced RF leakage for suppressing the multipacting effect in the high power coaxial couplers.NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT,988,8.
MLA	Lin, Zeqiang,et al."Development of a DC bias structure with reduced RF leakage for suppressing the multipacting effect in the high power coaxial couplers".NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 988(2021):8.