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Report No.

Divertor density measurements using mm-wave interferometer in JT-60U

Takenaga, Hidenobu; Oyama, Naoyuki; Asakura, Nobuyuki; Sakamoto, Yoshiteru; Sakata, Shinya

A mm-wave interferometer has been developed for divertor density measurements in JT-60U. The measurements performed for several plasma phases indicated the feasibility of the system except for the ELMy H-mode phase. In the ELMy H-mode phase, the signal intensity was significantly reduced probably due to refraction. A sharp drop in the divertor plasma density was found during a transition to the ELM free H-mode phase concomitant with a sharp drop in D$$_{alpha}$$ emission intensity. Low frequency fluctuation of $$sim$$1.5 kHz was observed in the divertor plasma density during the quiescent H-mode phase. Feedback control of the divertor plasma density was successfully demonstrated using the mm-wave interferometer as a real-time monitor and the gas-puffing from the bottoms of the W-shaped divertor as an actuator.



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