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Effect of Radial Transport Loss on the Asymmetry of ELM Heat Flux
Author(s) -
Takizuka T.,
Oyama N.,
Hosokawa M.
Publication year - 2008
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.200810037
Subject(s) - divertor , heat flux , asymmetry , mechanics , flux (metallurgy) , materials science , convection , atomic physics , physics , plasma , heat transfer , nuclear physics , tokamak , metallurgy , quantum mechanics
The dynamics of SOL‐divertor plasmas after an ELM crash is studied with a one‐dimensional particle simulation code, PARASOL. The ELM crash occurs off‐centrally in the SOL region, and the ELM heat flux to the near divertor plate and that to the far divertor plate become asymmetric. The peak heat flux to the near plate is larger as compared to the far plate. The asymmetry in the peak heat flux increases with the connection‐length ratio. The imbalance in the heat deposition, however, is small. The radial transport loss of ELM flux creates the asymmetry in the heat deposition, but the imbalance is still not large even for the large radial transport loss rate. The electron heat flux to the far plate brought by the SOL current is one of the causes of a small imbalance in the heat deposition. Another cause is the asymmetric SOL flow and its convective heat flux, whose stagnation point stays for a long period near the ELM crash location. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)