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Electron Impact Ionization Cross Sections of Tungsten Atoms and Tungsten Ions

Ghanshyam PUROHIT^1,2), Daiji KATO^1,3,4) and Izumi MURAKAMI^1,3)

1)

National Institute for Fusion Science, National Institutes of Natural Sciences, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan

2)

Department of Physics, Sir Padampat Singhania University, Bhatewar, Udaipur-313601, India

3)

Department of Fusion Science, SOKENDAI, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan

4)

Department of Advanced Energy Engineering Science, Kyushu University, Kasuga, Fukuoka 816-8580, Japan

(Received 27 December 2017 / Accepted 7 March 2018 / Published 10 April 2018)

Abstract

Tungsten (W) and tungsten based materials have been recommended as the plasma facing component in the current fusion devices. The electron induced processes on these materials are of prime importance for the application purposes. Electron impact total ionization cross sections (TICS) are reported for the Watoms and W⁺ ions. The TICSs have been calculated in the variants of distorted wave approximation (DWA) using Hartree-Fock wave functions and distorted potential with semi-classical exchange. Present TICS results have been compared with the available theoretical and experimental results. Reasonable agreement with the existing theoretical results have been obtained for the TICS of W atoms by present semi-relativistic distorted wave approach, however there are certain discrepancies for the TICS of W⁺ ions. Differential cross sections (DCSs) have also been calculated at projectile energy 100 eV for the ionization of W atoms and W⁺ ions and the DCSs have been found to be sensitive on the scattering angle.

Copyright (c) 2018 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

total cross section, DWA, ionization, Hartree-Fock potential, fusion plasma, differential cross section, TDCS, TICS

DOI: 10.1585/pfr.13.3401026

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