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Investigation of Tin Removal for Liquid Metal Tokamak Divertor by Low Pressure Argon Arc with Hot Tungsten Cathode System

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Abstract

The influence of a low-pressure argon arc with a hot tungsten cathode on the thin tin film with a negative bias voltage applied during the plasma treatment was investigated to study the tin film removal from the sample surface. Samples were prepared on a stainless-steel substrate using DC magnetron sputtering and hybrid HiPIMS assisted with electron cyclotron wave resonance (ECWR). During treatment an optical emission spectroscopy was employed to detect and characterize the emission line of tin spectrum and the electron density and temperature were measured by Langmuir probe. Morphological study by a scanning electron microscope helped to gain insight to the mechanism of tin removal from the substrate. In addition, elemental compositions of tin layer before and after treatment was measured by an energy dispersive X-ray spectroscopy. We believe that this study contributes to finding a proper treatment for tin removal from plasma facing surfaces of tokamaks using tin in the liquid metal divertor.

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Data Availability

The datasets are available from the corresponding author on a reasonable request.

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Acknowledgements

This work was partial financial supported by Czech Science Foundation, Grant No. 24-10156S. The authors is grateful to RNDr. Adolf Kaňka Dr. for his informative discussion and useful recommendation in the field of optical emission spectroscopy.

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Authors and Affiliations

  1. Faculty of Mathematics and Physics, Charles University, 180 00, Prague, Czech Republic

    Himanshu Mishra, Tomáš Mašek, Zdeněk Turek, Pavel Kudrna & Milan Tichý

  2. Faculty of Nuclear Science and Physical Engineering, Czech Technical University in Prague, 166 36, Prague, Czech Republic

    Tomáš Mašek

  3. Institute of Physics of the Czech Academy of Sciences, 182 00, Prague, Czech Republic

    Martin Čada & Zdeněk Hubička

Authors
  1. Himanshu Mishra
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  2. Tomáš Mašek
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  7. Milan Tichý
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Contributions

Conceptualization, [MT]; Methodology, [TH], [TM], [ZT], [MT]; Validation, [TH], [MT], [PK] and [MČ]; Investigation, [TH], [ZT], [TM], [MT] and [MČ]; Data curation, [TH], [TM], [ZT], [MT]; Writing—original draft preparation, [TH] , [MČ], [TM] and [MT]; Writing—review and editing, [TH] and [MT]; Supervision, [MT] and [MČ]; Project administration, [MT] and [ZH] All authors have read and agreed to the published version of the manuscript.

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Correspondence to Himanshu Mishra.

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Mishra, H., Mašek, T., Turek, Z. et al. Investigation of Tin Removal for Liquid Metal Tokamak Divertor by Low Pressure Argon Arc with Hot Tungsten Cathode System. J Fusion Energ 42, 36 (2023). https://doi.org/10.1007/s10894-023-00374-8

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