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First EMC3‐EIRENE Simulations with Divertor Legs of LHD in Realistic Device Geometry
Author(s) -
Kawamura G.,
Feng Y.,
Kobayashi M.,
Shoji M.,
Morisaki T.,
Masuzaki S.,
Tomita Y.
Publication year - 2014
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.201410027
Subject(s) - divertor , large helical device , plasma , ionization , atomic physics , electron temperature , hydrogen , physics , electron , materials science , mechanics , computational physics , ion , nuclear physics , tokamak , quantum mechanics
An extended mesh system for EMC3‐EIRENE has been developed to simulate peripheral plasma including the ergodic and the divertor leg regions of LHD. Both the open and the closed divertor configurations are available. A series of simulations for 8MW input power, five different electron densities at the LCFS (last closed flux surface) and the open/closed configurations were carried out. Approximately 10 times larger neutral pressure was observed under the dome structure compared with the open configuration, which is in good agreement with experimental measurements. In the case of the closed configuration, the leg regions have a large contribution of ionization to hydrogen recycling. In the case of high density discharges, however, electron temperature in the legs becomes low and the major contribution of ionization moves to the ergodic region. Significant influence of configurations is observed in the inboard side of LHD, where closed divertor components are installed but little influence is seen near the LCFS. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)