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

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

Research output: Contribution to journalArticle

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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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recycling
detachment
Recycling
asymmetry
Plasmas
Electron temperature
flux (rate)
Ionization
electron energy
Ions
Fluxes
ionization
Geometry
causes
coefficients
geometry

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

Cite this

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

Reversal of in-out asymmetry of the particle-recycling associated with X-point MARFE and plasma detachment. / Hatayama, Akiyoshi; Segawa, H.; Komatsu, N.; Schneider, R.; Coster, D. P.; Hayashi, N.; Sakurai, S.; Asakura, N.

In: Journal of Nuclear Materials, Vol. 290-293, 03.2001, p. 407-412.

Research output: Contribution to journalArticle

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

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