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JFT-2M Project | AMTEX Program on JFT-2M

Update:2018年12月26日更新
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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% right arrow goal  10%
Ripple magnitude  2%  Right arrow  0.8%


Reduce the ripple by inserting ferritic steel

TF coil, Vacuum vessel, Ferritic board with Feritic Board, Without Ferritic Board

2. Plasma-material test

Reactor structural material
Right arrow  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.