Magnetohydrodynamic activity during edge localized modes on ASDEX

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, , Citation S. Von Goeler et al 1990 Nucl. Fusion 30 395 DOI 10.1088/0029-5515/30/3/001

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1 Max-Planck-Institut für Plasmaphysik, Garching bei München, Federal Republic of Germany

2 * Permanent address: Princeton Plasma Physics Laboratory, Princeton University, Princeton, NJ 08543, USA.

Dates

  1. Received 18 January 1989

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0029-5515/30/3/395

Abstract

Magnetohydrodynamic (MHD) activity during edge localized modes (ELMs) has been monitored in the ASDEX tokamak. Besides a fast inward shift of the plasma column, a helical MHD perturbation has been found to accompany ELMs. For the discharges investigated, the helical instability has a poloidal mode number m of 3 or 4 and a toroidal mode number n of 1, and it propagates in the direction of the electron diamagnetic drift. It seems to be identical with the Toi mode, which has been observed to disappear during L-H transitions.

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