Development of plasma stored energy feedback control and its application to high performance discharges on JT-60U

Oikawa, Toshihiro; Tsuchiya, Katsuhiko; Kurihara, Kenichi; Kawamata, Yoichi; Fukuda, Takeshi*; Fujita, Takaaki; Neyatani, Yuzuru

Fusion Engineering and Design, 70(2), p.175 - 183, 2004/02

https://doi.org/10.1016/j.fusengdes.2003.11.002

The real-time feedback control of the plasma stored energy has been developed for control of the plasma MHD stability in the JT-60U tokamak. The plasma stored energy can be detected with high accuracy in real-time by the function parametrization method for various plasmas available in JT-60U, such as the ohmic plasma, the L-mode, the H-mode, the high poloidal beta mode and the reversed shear mode over a wide range of the plasma parameters. By manipulating the neutral beam injection power, the plasma stored energy has been successfully controlled along the preprogrammed reference waveform. Especially in the reversed shear mode, this feedback control scheme has improved the reproducibility of the formation of the internal transport barrier, and the MHD instability could be suppressed with keeping the normalized beta in the stable region. The D-T equivalent fusion amplification gain of 0.5 was sustained for 0.8 s in a reversed shear plasma by employing this feedback control scheme.

Development of plasma stored energy feedback control and its application to high performance discharges on JT-60U

Oikawa, Toshihiro; Tsuchiya, Katsuhiko; Kurihara, Kenichi; Kawamata, Yoichi; Fukuda, Takeshi*; Fujita, Takaaki; Akasaka, Hiromi; Yonekawa, Izuru; Neyatani, Yuzuru

JAERI-Research 2003-027, 19 Pages, 2003/12

JAERI-Research-2003-027.pdf:1.14MB

no abstracts in English

Plasma control in magnetic confinement devices; Plasma control in tokamaks

Fukuda, Takeshi

Purazuma, Kaku Yugo Gakkai-Shi, 75(12), p.1377 - 1395, 1999/12

https://doi.org/10.1585/jspf.75.1377

no abstracts in English