The constraint of plasma power balance on runaway avoidance

Nuclear Fushion

article

Christopher J. McDevitt¹  Xian-Zhu Tang²  Christopher J. Fontes²  Prashant Sharma²  Hyun-Kyung Chung³ 

[1] Nuclear Engineering Program, University of Florida;Los Alamos National Laboratory;Korea Institute of Fusion Energy

关键词: runaway electrons;    disruption mitigation;    tokamak;    disruptions;   

DOI  :  10.1088/1741-4326/acae38

来源: Institute of Physics Publishing Ltd.

【 摘 要 】

In a post-thermal-quench plasma, mitigated or unmitigated, the plasma power balance is mostly between collisional or Ohmic heating and plasma radiative cooling. In a plasma of atomic mixture {n_alpha}withαlabeling the atomic species, the power balance sets the plasma temperature, ion charge state distribution {n_alpha^i}withithe charge number, and through the electron temperature T_mathrm{e}and ion charge state distribution {n_alpha^i},the parallel electric field E_parallel.Since the threshold electric field for runaway avalanche growth E_mathrm{av}is also set by the atomic mixture, ion charge state distribution and its derived quantity, the electron density n_mathrm{e},the plasma power balance between Ohmic heating and radiative cooling imposes a stringent constraint on the plasma regime for avoiding and minimizing runaways when a fusion-grade tokamak plasma is rapidly terminated.

【 授权许可】

Unknown