Erosion of lithium coatings on TZM molybdenum and graphite during high-flux plasma bombardment |
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| Affiliation: | 1. Princeton Plasma Physics Laboratory, Princeton, NJ 08543, USA;2. FOM Institute DIFFER – Dutch Institute For Fundamental Energy Research, Trilateral Euregio Cluster, Associate EURATOM-FOM, BL-3430 BE Nieuwegein, The Netherlands;1. College of Physics Science and Technology, Guangxi University, Nanning 530004, China;2. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;1. Osaka Gas Chemical Co., Ltd., Domecity Gas Bldg. 2-37, Chiyozaki 3-chome-minami, Nishi-ku, Osaka 550-0023, Japan;2. Energy Technology Laboratories, Osaka Gas Co., Ltd., 6-19-9 Torishima, Konohana-ku, Osaka 554-0051, Japan;3. KRI Inc. Kyoto Reseach Park, 134, Chudoji Minami-machi, Shimogyo-ku, Kyoto 600-8813 Japan;1. Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, 1068 Xueyuan Avenue, Shenzhen University Town, 518055 Shenzhen, China;2. Department of Electronics Engineering, The Chinese University of Hong Kong, Hong Kong, China;1. Institute of Biophysics, Academy of Sciences of the Czech Republic, v.v.i., Královopolská 135, 612 65 Brno, Czech Republic;2. Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, Hlavní 1001, 250 68 Řež, Czech Republic;3. Central European Institute of Technology, Masaryk University, Kamenice 753/5, CZ-625 00 Brno, Czech Republic;1. Univ Lille Nord de France, UDSL, EA 4481, UFR Pharmacy, 59006 Lille, France;2. Department of Pharmacy, University Hospital, Lille, France;3. Department of Pharmacy, University Hospital, Clermont-Ferrand, France;4. EA 4676 C-Biosenss, Auvergne University, Clermont-Ferrand, France |
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| Abstract: | The rate at which Li films will erode under plasma bombardment in the NSTX-U divertor is currently unknown. It is important to characterize this erosion rate so that the coatings can be replenished before they are completely depleted. An empirical formula for the Li erosion rate as a function of deuterium ion flux, incident ion energy, and Li temperature was developed based on existing theoretical and experimental work. These predictions were tested on the Magnum-PSI linear plasma device capable of ion fluxes >1024 m−2 s−1, ion energies of 20 eV and Li temperatures >800 °C. Li-coated graphite and TZM molybdenum samples were exposed to a series of plasma pulses during which neutral Li radiation was measured with a fast camera. The total Li erosion rate was inferred from measurements of Li-I emission. The measured erosion rates are significantly lower than the predictions of the empirical formula. Strong evidence of fast Li diffusion into graphite substrates was also observed. |
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| Keywords: | Lithium Lithium sputtering Lithium evaporation Lithium radiation Lithium plasma surface interaction |
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