Vacuum vessel of KTX

Vacuum vessel of KTX

Vacuum vessel of KTX is made from 6-mm-thick 316L stainless steel with a corresponding wall time 2ms. The vessel is split at the vertical plane into two identical parts, which are bolted together and insulated from each other, as shown in figure 3. Thus there exist two vertical gaps as the entrance of the Ohmic field.

Poloidal limiter array and toroidal limiter array are mounted on the inner surface of the vacuum vessel, with height below 2cm. The material of the limiter array is molybdenum. In order to avoid significant error field caused by eddy currents around the ports with large size, 12 pumping ports with diameter 12cm are distributed symmetrically on the vessel to ensure a base vacuum pressure less than
10-6Pa. The diagnostic ports are reserved for probes and other advanced diagnostics, such as interferometers, soft X-ray array, Thomson scattering, and FIR polarimeter.