Study of Closed Divertor
ITER Physics R&D on Divertor
Reduce heat load on divertor target and sustain high core confinement simultaneously
Objectives on the JFT-2M Divertor Study
- Achievement of dense and cold divertor together with high density H-mode by strong gas puffing
- Optimization of baffle structure to enhance the divertor pressure and reduce the neutral back flow.
I. Closed Divertor Concept in JFT-2M
- JFT-2M adopted the closed divertor configuration in 1995 prior to JT-60U. It has been modified to have the most closed baffle structure compared with other machines up to date.
- UEDA-code simulation is also used to optimize the divertor configuration.
II. Coexistence of Dense and Cold Divertor and Improved Confinement Mode
|Dense and cold divertor state progresses by strong gas-puff into divertor chamber.
||Core plasma confinement does not degrade in the high density region up to =0.7.|
III. Divertor Exhaust: Development of the membrane pump system utilizing superpermeation property (Collaboration with NIFS)