Study of Closed Divertor
ITER Physics R&D on Divertor
Reduce heat load on divertor target and sustain high core confinement simultaneously
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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.
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I. Closed Divertor Concept in JFT-2M
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- 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.
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II. Coexistence of Dense and Cold Divertor and Improved Confinement Mode
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| 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)
