Overview of JT-60U results toward establishment of advanced tokamak operation

Oyama, Naoyuki; JT-60 Team

This paper reviews recent JT-60U experimental results toward establishment of advanced tokamak operation. In weak magnetic shear plasma, high $beta_{rm N} sim 3$ exceeding $beta_{rm N}^{no-wall}$ is sustained for s with RWM stabilization. A combined external current drivers of negative-ion based NB and lower-hybrid waves together with high $f_{rm BS}$ of 0.5 can sustain whole plasma current of 0.8 MA for 2s. In reversed magnetic shear plasma, high $beta_{rm N} sim 2.7$ exceeding $beta_{rm N}^{no-wall}$ with $q_{95} sim 5.3$ , $H_{rm H98(y,2)} sim 1.7$ and $f_{rm BS} sim 0.9$ is obtained with wall stabilization. In long-pulse plasmas with positive magnetic shear, high $beta_{rm N}H_{rm H98(y,2)}$ of 2.6 with $beta_{rm N} sim 2.6$ and $H_{rm H98(y,2)} sim 1$ is sustained for 25 s significantly longer than the current diffusion time.

Language	:	English
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Meeting title	:	22nd IAEA Fusion Energy Conference (FEC 2008)
Held date	:	2008/10
Location (city)	:	Geneva
Location (country)	:	Switzerland
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Keywords	:	no keyword
Research Facility	:	JT-60(臨界プラズマ試験装置)
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Registration No. : BB20082353
JAEA Abstracts No. :
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