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Real-time measurement and feedback control of ion temperature profile and toroidal rotation using fast CXRS system in JT-60U

Yoshida, Maiko; Sakamoto, Yoshiteru; Sueoka, Michiharu; Kawamata, Yoichi; Oyama, Naoyuki; Suzuki, Takahiro; Kamada, Yutaka; JT-60 Team

A fast charge exchange recombination spectroscopy (CXRS) system has been developed for the real-time measurement and feedback control of ion temperature ($$T$$$$_{rm i}$$) profile and toroidal rotation velocity ($$V$$$$_{rm t}$$) in JT-60U. In order to control $$T$$$$_{rm i}$$ and $$V$$$$_{rm t}$$ in real-time, the charge exchange recombination spectroscopy with high time resolution, the real-time processor system, and the real-time control system have been developed. Utilizing this system, real-time control of the $$T$$$$_{rm i}$$ gradient has been demonstrated with neutral beams at high beta plasmas. The strength of the internal transport barrier is controlled. Moreover, the real-time control of $$V$$$$_{rm t}$$ has been demonstrated from counter (anti parallel to the plasma current, $$I$$$$_{rm p}$$) to co (parallel to the $$I$$$$_{rm p}$$) direction.

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Category:Nuclear Science & Technology

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