- Introduction of JFT-2M
- JFT-2M Tokamak
- Panorama of the Device
- Main Performance
- Current Research Subjects
- Collaborations
- Advanced material tokamak experiment program
- Development of new fuelling method
- Compact toroid injection: collaboration with HIT - - Study of improved confinement
- Heavy ion beam probe: collaboration with NIFS - - Study of closed divertor
- Disruption control study with ECH/ECCD
- Fast wave current drive study
AMTEX Program on JFT-2M (Advanced Material Tokamak Experiment)
AMTEX is planned for the development of reactor material as well as toroidal field ripple reduction of ITER.
1. Ripple reduction test
Guideline for reduction of α particle loss in ITER
for negative shear,
Ripple loss 27% 
goal 10%
Ripple magnitude 2% 0.8%
Reduce the ripple by inserting ferritic steel
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2. Plasma-material test
Reactor structural material
Low activation ferritic steel is promising. However, its magnetism is worried about because of the error field.
Replace material of the JFT-2M vacuum vessel with ferritic steel
Issues of Ferritic Vacuum Vessel
Plasma-wall interaction
Disruption by mode lock due to error field
Reduction of toroidal field ripple
Compatibility with improved confinement, etc.