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Report No.

Development in diagnostics application to control of advanced tokamak plasma

Koide, Yoshihiko

An economically attractive DEMO requires a steady-state plasma with high bootstrap-current fraction fBS and high normalized beta. Development in diagnostic application to control of such advanced tokamak plasma is in progress worldwide, which will be discussed in this talk. For example, plasmas with a fraction of DEMO-relevant fBS of 70% have been sustained for 8s in JT-60 by real-time control of toroidal plasma flow based on the current profile measurement by which moderate relaxation of pressure gradient is induced, resulting into avoidance of collapse triggered at integer q$$_{min}$$ surfaces. In this experiment, change in the q value as a response to the pressure-gradient control was found to become big in the high fBS regime. Issues on (1) application of the present-day control methods to DEMO with self-heating, and (2) limitation of port space for the advanced control to keep a sufficient tritium-breeding ratio are also addressed.



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