Diamond-Coated Plasma Probes for Hot and Hazardous Plasmas

doi:10.3390/ma13204524

HFCAS OpenIR

	Diamond-Coated Plasma Probes for Hot and Hazardous Plasmas
	Ionita, Codrina 1; Schrittwieser, Roman 1; Xu, Guosheng2 ; Yan, Ning2 ; Wang, Huiqian 2; Naulin, Volker 3; Rasmussen, Jens Juul 3; Steinmuller-Nethl, Doris 4
	2020-10-01
发表期刊	MATERIALS
通讯作者	Schrittwieser, Roman(roman.schrittwieser@uibk.ac.at)
摘要	Plasma probes are simple and inexpensive diagnostic tools for fast measurements of relevant plasma parameters. While in earlier times being employed mainly in relatively cold laboratory plasmas, plasma probes are now routinely used even in toroidal magnetic fusion experiments, albeit only in the edge region, i.e., the so-called scrape-off layer (SOL), where temperature and density of the plasma are lower. To further avoid overheating and other damages, in medium-size tokamak (MST) probes are inserted only momentarily by probe manipulators, with usually no more than a 0.1 s per insertion during an average MST discharge of a few seconds. However, in such hot and high-density plasmas, their usage is limited due to the strong particle fluxes onto the probes and their casing which can damage the probes by sputtering and heating and by possible chemical reactions between plasma particles and the probe material. In an attempt to make probes more resilient against these detrimental effects, we tested two graphite probe heads (i.e., probe casings with probes inserted) coated with a layer of electrically isolating ultra-nano-crystalline diamond (UNCD) in the edge plasma region of the Experimental Advanced Superconducting Tokamak (EAST) in Hefei, People's Republic of China. The probe heads, equipped with various graphite probe pins, were inserted frequently even into the deep SOL up to a distance of 15 mm inside the last closed flux surface (LCFS) in low- and high-confinement regimes (L-mode and H-mode). Here, we concentrate on results most relevant for the ability to protect the graphite probe casings by UNCD against harmful effects from the plasma. We found that the UNCD coating also prevented almost completely the sputtering of graphite from the probe casings and thereby the subsequent risk of re-deposition on the boron nitride isolations between probe pins and probe casings by a layer of conductive graphite. After numerous insertions into the SOL, first signs of detachment of the UNCD layer were noticed.
关键词	plasma plasma probes hot plasma hazardous plasma graphite sputtering re-deposition ultra-nano-crystalline diamond coating
DOI	10.3390/ma13204524
关键词[WOS]	NANO-CRYSTALLINE DIAMOND ; LANGMUIR PROBE ; FUSION
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[U19A20113] ; National Natural Science Foundation of China[11975175] ; Austrian Science Fund (FWF)[P19901] ; University of Innsbruck, Austria
项目资助者	National Natural Science Foundation of China ; Austrian Science Fund (FWF) ; University of Innsbruck, Austria
WOS研究方向	Materials Science
WOS类目	Materials Science, Multidisciplinary
WOS记录号	WOS:000585570500001
出版者	MDPI
引用统计	被引频次：2[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.hfcas.ac.cn:8080/handle/334002/105245
专题	中国科学院合肥物质科学研究院
通讯作者	Schrittwieser, Roman
作者单位	1.Univ Innsbruck, Inst Ion Phys & Appl Phys, A-6020 Innsbruck, Austria 2.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China 3.Tech Univ Denmark, Dept Phys, DK-2800 Lyngby, Denmark 4.CarbonCompetence GmbH, Weisstr 9, A-6112 Wattens, Austria
推荐引用方式 GB/T 7714	Ionita, Codrina,Schrittwieser, Roman,Xu, Guosheng,et al. Diamond-Coated Plasma Probes for Hot and Hazardous Plasmas[J]. MATERIALS,2020,13.
APA	Ionita, Codrina.,Schrittwieser, Roman.,Xu, Guosheng.,Yan, Ning.,Wang, Huiqian.,...&Steinmuller-Nethl, Doris.(2020).Diamond-Coated Plasma Probes for Hot and Hazardous Plasmas.MATERIALS,13.
MLA	Ionita, Codrina,et al."Diamond-Coated Plasma Probes for Hot and Hazardous Plasmas".MATERIALS 13(2020).