Emission of high rovibrational hydrogen molecules under detached plasma conditions by recycling on the tungsten wall

Abstract It is well known that the rate coefficient of molecular-assisted recombination (MAR) varies by several orders of magnitude depending on the rovibrational states of the hydrogen molecules. A molecular dynamics simulation is performed to estimate the rovibrational states of recycled hydrogen...

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Bibliographic Details
Published inNuclear fusion Vol. 64; no. 12; pp. 126067 - 126074
Main Authors Saito, Seiki, Nakamura, Hiroaki, Sawada, Keiji, Hoshino, Kazuo, Kojima, Yuki, Doi, Takeshi, Kobayashi, Masahiro, Hasuo, Masahiro, Homma, Yuki, Yamoto, Shohei
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.12.2024
Subjects
edge plasma
hydrogen recycling
molecular dynamics
molecules
neutral transport
rovibrational state
tungsten
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Summary:Abstract It is well known that the rate coefficient of molecular-assisted recombination (MAR) varies by several orders of magnitude depending on the rovibrational states of the hydrogen molecules. A molecular dynamics simulation is performed to estimate the rovibrational states of recycled hydrogen molecules at the divertor in the JA-DEMO reactor under detached plasma conditions. The simulation results reveal that molecules in high rovibrational states are released even with low incident energy, which will be the dominant condition under detached plasma conditions. Molecules generated in this way can strongly affect the formation of the detached plasma via a molecular assisted-process such as MAR.
Bibliography:NF-106813.R1
ISSN:0029-5515
1741-4326
DOI:10.1088/1741-4326/ad82f8