In-situ plasma cleaning to decrease the field emission effect of half-wave superconducting radio-frequency cavities

doi:10.1016/j.nima.2018.07.039

	In-situ plasma cleaning to decrease the field emission effect of half-wave superconducting radio-frequency cavities
	Zhao, Hongwei1 ; Chu, Qingwei 1; Xiong, Pingran1,2 ; Guo, Hao 1; Li, Yongming 3; Li, Chunlong1 ; Huang, Shichun 1; Hu, Chuanfei 1,2; Yang, Lei1,2 ; Wu, Andong 1,2
刊名	NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
	2018-10-11
卷号	905 页码:61-70
关键词	In-situ plasma cleaning Half-wave SRF cavity Optical emission spectra Contamination Field emission effect
ISSN号	0168-9002
DOI	10.1016/j.nima.2018.07.039
英文摘要	The in-situ plasma cleaning technique using the chemical reactive oxygen plasma to remove the hydrocarbon contaminants, the outmost layer of the inner surface of the HWR cavity, has been explored at Institute of Modern Physics, CAS. For the purpose of cleaning the HWR cavity in the cryomodule by plasma, an offline apparatus for the plasma discharge study was set up, which duplicates the assembly of the cavity inside the cryomodule. Plasma ignition procedures were investigated. And the plasma parameters such as free electron number density, electron temperature and dissociated oxygen atom intensity were diagnosed by optical emission spectra to optimize the operation conditions for plasma in-situ cleaning of the HWR cavity. To evaluate the efficiency of the plasma in-situ cleaning of the HWR cavity, the related experiments were carried out on the vertical test stand. The results show that the hydrocarbon contaminants on the inner surface of the cavity were removed, and the maximal available accelerating gradient of the cavity was improved by 29% due to the mitigation of field emission inside the cavity after plasma cleaning. Details of these experimental results and observations are discussed in this article.
资助项目	National Natural Science Foundation for Young Scientists of China[11505255]
WOS关键词	SPECTROSCOPY ; TEMPERATURE ; DESIGN ; RF
WOS研究方向	Instruments & Instrumentation ; Nuclear Science & Technology ; Physics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000444425700008
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/59672]
专题	近代物理研究所_直线加速器中心近代物理研究所_兰州重离子研究装置
通讯作者	Li, Yongming; Huang, Shichun
作者单位	1.Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Gansu, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.GLVAC Ind Technol Res Inst High Power Devices, Kunshan 215300, Peoples R China
推荐引用方式 GB/T 7714	Zhao, Hongwei,Chu, Qingwei,Xiong, Pingran,et al. In-situ plasma cleaning to decrease the field emission effect of half-wave superconducting radio-frequency cavities[J]. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT,2018,905:61-70.
APA	Zhao, Hongwei.,Chu, Qingwei.,Xiong, Pingran.,Guo, Hao.,Li, Yongming.,...&Chen, Long.(2018).In-situ plasma cleaning to decrease the field emission effect of half-wave superconducting radio-frequency cavities.NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT,905,61-70.
MLA	Zhao, Hongwei,et al."In-situ plasma cleaning to decrease the field emission effect of half-wave superconducting radio-frequency cavities".NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 905(2018):61-70.