D-T plasma of self-sustained burning under high performance

Abstract

By adopting a Bohm-type thermal diffusion coefficient related to the energy confinement enhancement factor H within the conventional magnetic shear regime,and a mixed Bohm-gyro-Bohm thermal diffusion coefficient related to the shear within the negative central magnetic shear regime,considering the effect of the α particle anomalous diffusion and the dynamic feedback heating,and starting from energy transport of electrons and ions,we have studied the high performance self-sustaining burning deuterium-tritium plasma under a given plasma density profile for the two different kinds of magnetic shear regimes.Some conclusions are obtained:under the conventional shear,only when H≥3,the D-T burning can produce a large power output,and when H is larger than a certain value(H≈4),D-T plasma self-sustained burning can be maintained without the dynamic feedback heating;under the negative central shear,the plasmas have a higher plasma performance and a larger power output than that under conventional shear,and D-T plasma self-sustained burning can be maintained without the dynamic feedback heating power,the suitable alpha particle diffusion is advantage ous to D-T plasma burning under the conventional shear,and D-T self-sustained burning cannot be maintained under a large α particle anomalous diffusion for the negative central shear.The dynamic feedback heating power is important for sustaining D-T plasma burning under the conventional shear.