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The outer mode is one of the magnetohydrodynamics (MHD) modes which limits the fusion performance of the hot-ion H-mode discharges in Joint European Torus (JET). Previously it was proposed that the outer mode is a non-linearly saturated external kink mode. This was based on the localization of the perturbation close to the edge as observed in the soft X-ray (SXR), the electron temperature and the electron density measurements. Also, MHD stability calculations showed that the plasma edge is close to the ideal external kink stability boundary at the time when the outer mode is observed. In this paper, we compare the SXR data of the outer mode with predictions based on the mode structure of the ideal n=1 external kink mode. Excellent agreement is found confirming the identification of the outer mode as an external kink mode.

Additional information

Authors: HUYSMANS G, JET Joint Undertaking, Abingdon, Oxon (GB);ALPER B, JET Joint Undertaking, Abingdon, Oxon (GB);HENDER T, AEA Fusion, Culham Laboratory, Abingdon, Oxon (GB)
Bibliographic Reference: Report: JET-P(97)48 EN (1997) 11pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon, OX14 3EA (GB)
Record Number: 199810257 / Last updated on: 1998-03-09
Original language: en
Available languages: en
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