Engineering design and control scenario for steady-state high-beta operation in National Centralized Tokamak

The mission of the National Centralized Tokamak (NCT) is to establish high-beta steady-state plasma operation for DEMO and to contribute to ITER. Plasma performance with high-beta conditions is discussed. It is found that near break-even class plasma (QDTeq>=0.7) with high beta (βN>=3.5) is achievable with 25MW of NB power at IP=4.0MA and an aspect ratio of 2.6. High beta with steady-state full current drive is possible with 13MW of NB power at IP=1.5-1.7MA. In the engineering design activity of NCT, the strength of the support structure and strength of material for the conductor is confirmed for the superconducting coils, and the successful progress of R and D of boron-loaded resin for neutron shielding is discussed