Observation of Resistive Wall Modes in JT-60U

概要

論文の詳細を見る
Resistive wall modes (RWM) associated with ideal magnetohydrodynamic current-driven (β_N<0.2) and pressure-driven (β_N>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 Alfven 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 τ_w^<-1> (τ_w is the resistive diffusion time of the wall) to larger than 10^2 τ_w^<-1> in the case of pressure-driven (high β) RWMs.
社団法人プラズマ・核融合学会の論文
2002-05-25