Plasma equilibrium control during slow plasma current quench with avoidance of plasma-wall interaction in JT-60U
R. Yoshino; Y. Nakamura; Y. Neyatani; R. Yoshino; Naka Fusion Res. Establ., JAERI, Ibaraki, Japan; Y. Nakamura; Naka Fusion Res. Establ., JAERI, Ibaraki, Japan; Y. Neyatani; Naka Fusion Res. Establ., JAERI, Ibaraki, Japan
Журнал:
Nuclear Fusion
Дата:
1997-08-01
Аннотация:
In JT-60U a vertical displacement event (VDE) is observed during slow plasma current quench (I<sub>p</sub> quench) for a vertically elongated divertor plasma with a single null. The VDE is generated by an error in the feedback control of the vertical position of the plasma current centre (Z<sub>J</sub>). It has been perfectly avoided by improving the accuracy of the Z<sub>J</sub> measurement in real time. Furthermore, plasma-wall interaction has been avoided successfully during slow I<sub>p</sub> quench owing to the good performance of the plasma equilibrium control system
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