Hot-Tail Runaway Seed Landscape during the Thermal Quench in Tokamaks
Journal article, 2021

Runaway electron populations seeded from the hot tail generated by the rapid cooling in plasma-terminating disruptions are a serious concern for next-step tokamak devices such as ITER. Here, we present a comprehensive treatment of the thermal quench, including the superthermal electron dynamics, heat and particle transport, atomic physics, and radial losses due to magnetic perturbations: processes that are strongly linked and essential for the evaluation of the runaway seed in disruptions mitigated by material injection. We identify limits on the injected impurity density and magnetic perturbation level for which the runaway seed current is acceptable without excessive thermal energy being lost to the wall via particle impact. The consistent modeling of generation and losses shows that runaway beams tend to form near the edge of the plasma, where they could be deconfined via external perturbations.

Author

Ida Svenningsson

Chalmers, Physics, Subatomic, High Energy and Plasma Physics

Ola Embréus

Chalmers, Physics, Subatomic, High Energy and Plasma Physics

Mathias Hoppe

Subatomic, High Energy and Plasma Physics PP

Sarah Newton

Culham Lab

Tünde Fülöp

Chalmers, Physics, Subatomic, High Energy and Plasma Physics

Physical Review Letters

0031-9007 (ISSN) 1079-7114 (eISSN)

Vol. 127 3 035001

Subject Categories

Other Physics Topics

Fusion, Plasma and Space Physics

Condensed Matter Physics

DOI

10.1103/PhysRevLett.127.035001

More information

Latest update

7/30/2021