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 |
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.
