Journal of Plasma and Fusion Research
Print ISSN : 0918-7928
Contributed Paper
Observation of Resistive Wall Modes in JT-60U
Satoru TAKEJIShinji TOKUDAGenichi KURITATakahiro SUZUKIAkihiko ISAYAMAManabu TAKECHINaoyuki OYAMATakaaki FUJITAShunsuke IDEShinichi ISHIDAYutaka KAMADAToshihiro OIKAWAYoshiteru SAKAMOTOTakashi TUDAthe JT-60 Team
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2002 Volume 78 Issue 5 Pages 447-454

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Abstract

Resistive wall modes (RWM) associated with ideal magnetohydrodynamic current-driven (βN < 0.2) and pressure-driven (βN > 2.4) kink modes with low toroidal mode number n (n = 1) have been identified in JT-60U. The pressure-driven RWM occurs at the plasma toroidal rotation of about 1% the Alfvén speed without clear continuous slowing down of the plasma toroidal rotation. Occurrence of n = 1 RWMs result in thermal quench accompanied by higher n (n ≥ 2) modes. In the case of current-driven (˜ zero β) RWMs, a thermal quench occurs only at the peripheral region just after the RWM. In contrast, a thermal quench occurs in the whole plasma region following a drastic increase in the growth rate of the RWM from the order of τw-1w is the resistive diffusion time of the wall) to larger than 102 τw-1in the case of pressure-driven (high β) RWMs.

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© 2002 by The Japan Society of Plasma Science and Nuclear Fusion Research
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