Reversal of in-out asymmetry of the particle-recycling associated with X-point MARFE and plasma detachment

A. Hatayama, H. Segawa, N. Komatsu, R. Schneider, D. P. Coster, N. Hayashi, S. Sakurai, N. Asakura

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Abstract

Reversal of in-out asymmetry of the particle recycling in tokamak divertor regions and its physical mechanism have been studied. Numerical calculations by the `B2-EIRENE' code have been done for the JT-60U open divertor geometry. The following two cases, nD = 1.0×1019 m-3 and nD = 2.0×1019 m-3 for the D+ ion density at the core interface boundary, have been calculated. In the high-density case, typical behaviors of X-point MARFE and plasma detachment have been observed. In addition, asymmetry of the particle recycling between the inner and the outer divertor regions is reversed in comparison with the low-density case. The difference of the electron temperature between the inner and the outer regions together with the Te-dependence of the ionization rate coefficient is shown to be a possible cause of the reversal of the recycling source. Also, the difference of pressure loss between two regions plays a key role in the in-out asymmetry of the particle flux at the plate.

Original languageEnglish
Pages (from-to)407-412
Number of pages6
JournalJournal of Nuclear Materials
Volume290-293
DOIs
Publication statusPublished - 2001 Mar

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ASJC Scopus subject areas

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

Cite this

Hatayama, A., Segawa, H., Komatsu, N., Schneider, R., Coster, D. P., Hayashi, N., Sakurai, S., & Asakura, N. (2001). Reversal of in-out asymmetry of the particle-recycling associated with X-point MARFE and plasma detachment. Journal of Nuclear Materials, 290-293, 407-412. https://doi.org/10.1016/S0022-3115(00)00639-5