Plasma and Fusion Research

Volume 17, 2403044 (2022)

Regular Articles

Electron and Proton Energy Loss via Rovibrational Excitation of Molecular Hydrogen in Fusion Detached Plasmas
Keiji SAWADA
Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan
(Received 10 January 2022 / Accepted 28 February 2022 / Published 6 June 2022)

Abstract

Electron and proton energy-loss rate coefficients in a fusion detached plasma, formed through collisions with molecular hydrogen, are investigated using a rovibrationally resolved collisional-radiative model of molecular hydrogen [K. Sawada and M. Goto, Atoms 4, 29 (2016)]. The rovibrational population distribution of X1Σg+ in electrons and protons, both with a temperature of 1 eV and density of 1016 cm−3, is solved time-dependently with an initial 300 K Boltzmann distribution. Energy loss of electrons by rovibrational excitation in X1Σg+ is approximately one or two orders of magnitude larger than that by excitation to the triplet b3Σu+ state.

Keywords

collisional-radiative model, molecular hydrogen, rate coefficient, vibrational, rotational, detached plasma, molecular assisted recombination

DOI: 10.1585/pfr.17.2403044

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