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Report No.
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RF heated wall conditioning discharges in JT-60U

Itami, Kiyoshi; Asakura, Nobuyuki; Tamai, Hiroshi ; Moriyama, Shinichi; Kaminaga, Atsushi

In series of experiments in 2000 and 2008, ECRF (Electron Cyclotron Range of Frequency) wall conditioning discharges were extensively studied in JT-60U with toroidal magnetic field of $$B$$$$_{rm T}$$ = 3.6 T and ECRF heating power of PECH $$le$$ 2.5 MW. Homogeneous He (helium) conditioning discharges were reproducibly obtained by applying the horizontal field as large as 0.2% of $$B$$$$_{rm T}$$. It was found that the horizontal field is effective to extend He plasma toward high field side from the fundamental ECH resonant surfaces. The ECRF wall conditioning discharge with PECH = 2.5 MW and pulse length of $$t$$$$_{rm pulse}$$ = 1.5 s was applied to the plasma disruption with the stored energy of W = 3.3 MJ. And the successful recovery of the current ramp-up with 0.5 V/m of ohmic electric field was obtained.

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Category:Materials Science, Multidisciplinary

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