Plasma and Fusion Research

Volume 3, S1065 (2008)

Regular Articles

Temporal Evolution of the Pressure Profile and Mode Behavior during Internal Reconnection Events in the MAST Spherical Tokamak

Hiroshi TOJO, Mikhall P. GRYAZNEVICH¹⁾, Akira Ejiri, Alan SYKES¹⁾ and Yuichi TAKASE

Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
1): EURATOM/UKAEA Fusion Association, Culham Science Centre, OX14 3DB, UK

(Received 16 November 2007 / Accepted 6 February 2008 / Published 4 August 2008)

Abstract

Mode behaviors including non-linear development and pressure profiles during internal reconnection events are clarified in the MAST spherical tokamak. In a q₀ > 1 discharge, the tearing mode is a trigger; however, non-linearity of modes is not confirmed. On the other hand, in a q₀ < 1 discharge, the harmonics of a m/n = 4/1 mode of ∼22 kHz are confirmed. Method for identification of poloidal mode in ST configuration is also given.

Keywords

IRE, spherical tokamak, bicoherence, poloidal mode, reconnection

DOI: 10.1585/pfr.3.S1065

Full Text

PDF format (7.1Mbytes) PDF Download

References

[1] N. Mizuguchi et al., Phys. Plasmas 7, 940 (2000).
[2] B. Lloyd et al., Nucl. Fusion 43, 1665 (2003).
[3] L. Lao et al., Nucl. Fusion 25, 1611 (1985).
[4] Y.C. Kim and E.J. Powers, Phys. Fluids 21, 1452 (1978).
[5] Y. Nagashima et al., Plasma Phys. Control. Fusion 49, 1611 (2007).
[6] L.C. Appel et al., Nucl. Fusion 41, 169 (2001).

This paper may be cited as follows:

Hiroshi TOJO, Mikhall P. GRYAZNEVICH, Akira Ejiri, Alan SYKES and Yuichi TAKASE, Plasma Fusion Res. 3, S1065 (2008).