Effect of transport on MAR in detached divertor plasma

Kenji Miyamoto, A. Hatayama, Y. Ishii, T. Miyamoto, A. Fukano

Research output: Contribution to journalConference article

6 Citations (Scopus)

Abstract

The effect of H2 transport on the onset of MAR in the relatively lower plasma parameter regime of a detached state (ne = 1 × 1019 m-3, Te = 1 eV) is investigated theoretically. The vibrationally excited molecular densities and the degree of MAR are evaluated by using a 1-D Monte Carlo method (with transport effect), and by solving time-dependent 0-D rate equations without the transport term (without transport effect), respectively. It is found that the degree of MAR with transport is smaller than that without transport under the same H2 flow rate. Especially, the degree of MAR is negligible near the gas inlet. This smaller degree of MAR with transport is due to the lack of highly excited vibrational molecules which contribute to MAR. The hydrogen molecular density available for MAR is determined by the external hydrogen molecular source and the outflow due to transport, i.e., a 'net' confinement time.

Original languageEnglish
Pages (from-to)1036-1040
Number of pages5
JournalJournal of Nuclear Materials
Volume313-316
Issue numberSUPPL.
DOIs
Publication statusPublished - 2003 Mar 1
EventPlasma - Surface Interactions in Controlled Fusion Devices - Gifu, Japan
Duration: 2002 May 262002 May 31

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Keywords

  • Confinement time
  • Detached divertor plasma
  • H flow rate
  • MAR
  • Neutral transport
  • Vibrationally excited state hydrogen molecule

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering

Cite this

Miyamoto, K., Hatayama, A., Ishii, Y., Miyamoto, T., & Fukano, A. (2003). Effect of transport on MAR in detached divertor plasma. Journal of Nuclear Materials, 313-316(SUPPL.), 1036-1040. https://doi.org/10.1016/S0022-3115(02)01533-7