Tokamak chamber

The toroidal shaped chamber of main radius of 0.4 m and secondary radius of 0.1 m, is made of two layers with a free space in between. Both of these layers could be disassembled into two sections, if necessary. The first layer, which contains the plasma column, is called liner.

The liner is toroidal shaped vessel made of melted cylindrical waved tin-plate segments, 0.5 mm strong, with radius of 0.085 m and inner diameter of 200-230 mm. It is very important, that the liner is electrically insulated from the rest of the device. Its wavy design helps to eliminate heat dilatation, increase the resistance of the plate and helps to support the construction. It is thanks to the way of the melting, that liner can be disassembled into two sections, however, this had happened only once yet.

The second layer of the vessel is copper coating which covers the liner. The coating is about 20 mm strong and water cooled. It used to contain the second vacuum layer, however this function is not used anymore. The coating is now used to stabilize the plasma column position by inducing Foucalt currents and to hold coils of toroidal stabilisation field. As well as Rogowski coils for plasma current measurements.

References

1. Bardos L., Datlov J., Kopecky V., Kryska L., Musil J., Zacek F. :Experimental device Tokamak TM-1-MH
2. Bottom of the chamber
3. Cross sections of ports
4. Reduction DN260 and DN260
5. Cross sections of the chamber

Current status of the system

Currently, there are not any changes to the chamber being discussed. During the transport to the FNSPE premises the tokamak has not been disassembled, so none changes to the chamber took place. It was also shown, that during the transport none damages to the chamber took place.

Images