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Propagation Velocity Analysis of a Single Blob in the SOL

Satoru SUGITA, Masatoshi YAGI¹⁾, Sanae -I. ITOH¹⁾ and Kimitaka ITOH²⁾

Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga 816-8580, Japan

1)

Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan

2)

National Institute for Fusion Science, Toki 509-5292, Japan

(Received 1 June 2008 / Accepted 14 June 2008 / Published 10 July 2008)

Abstract

Nonlinear simulation of plasma blob propagation in the tokamak scrape-off layer is reported. Three types of model equations are introduced and the simulation results are compared. It is found that in the parameter regime where the interchange instability appears during the propagation process, the theoretical model of propagation velocity determined by the initial blob size provides a good approximation of the simulation results. In the regime where the Kelvin-Helmholtz instability appears, however, the blob velocity saturates at a lower value.

Copyright (c) 2008 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

plasma blob, scrape-off layer, interchange instability, Kelvin-Helmholtz instability

DOI: 10.1585/pfr.3.040

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References

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This paper may be cited as follows:

Satoru SUGITA, Masatoshi YAGI, Sanae -I. ITOH and Kimitaka ITOH, Plasma Fusion Res. 3, 040 (2008).