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Accumulation Process of High‐Z Impurity in Toroidal Rotating Tokamak Plasma
Author(s) -
Hoshino K.,
Takizuka T.,
Nakano T.
Publication year - 2010
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.201010063
Subject(s) - tokamak , pinch , toroid , plasma , physics , impurity , atomic physics , ionization , rotation (mathematics) , mechanics , ion , nuclear physics , quantum mechanics , geometry , mathematics
The accumulation process of high‐Z impurity in toroidal rotating tokamak plasma is investigated. A new inward pinch of high‐Z impurity due to the ionization/recombination processes is derived using an analytic model. This inward pinch is driven by the large deviation of a drift orbit from a magnetic surface and the resultant variation of the charge state along the drift orbit. The pinch velocity increases with increasing toroidal rotation speed in both the co‐direction and the ctr‐direction. The inward pinch expected by the analytic model is really observed in the numerical simulation using the IMPGYRO code (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)