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.
|Number of pages||6|
|Journal||Contributions to Plasma Physics|
|Publication status||Published - 2010 May|
- High-Z impurity
- Inward pinch
ASJC Scopus subject areas
- Condensed Matter Physics