Simulation of runaway electron production with CQL3D coupled to NIMROD

Petrov, Yu. V.; Kim, C. C.; Lao, L. L.; Harvey, R. W.

doi:10.1088/1741-4326/ac7b36

Title: Simulation of runaway electron production with CQL3D coupled to NIMROD

Journal Article · Thu Jul 14 00:00:00 EDT 2022 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ac7b36· OSTI ID:1875984

; Kim, C. C.;

; Harvey, R. W.

Abstract A coupling between two distinctly different codes—one magnetohydrodynamic (MHD) and another kinetic—is achieved and applied for simulation of runaway electron (RE) production. The 3D initial value MHD code NIMROD simulates a DIII-D pure neon shattered pellet injection plasma quench including the propagation and ablation of the fragments, ionization and recombination of the impurities, and the radiated and transported energies. The field data from NIMROD is then used by the bounce-averaged Fokker–Planck Collisional QuasiLinear 3D (CQL3D) kinetic code to simulate the production of REs and their radial transport. The coupling procedure involves mapping of data between different grids and adjustment of the NIMROD toroidal electric field when REs appear. It is shown that without the radial transport, a large RE current is generated, up to 30% of the pre-pellet ohmic current. However, when the radial transport is included in CQL3D, the RE current is reduced to undetectable level, consistent with experiment. Various forms of the radial diffusion are surveyed to determine conditions when the fast electrons would not have time to be accelerated to relativistic energies before they are lost to chamber wall.

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Research Organization:: General Atomics, San Diego, CA (United States); CompX, Del Mar, CA (United States); Univ. of California, Oakland, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: FC02-04ER54698; FG02-04ER54744; FG02-95ER54309; SC0016452; SC0018109; AC02-05CH11231

OSTI ID:: 1875984

Alternate ID(s):: OSTI ID: 1873600; OSTI ID: 1979419

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Vol. 62 Journal Issue: 9; ISSN 0029-5515

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: IAEA

Language:: English

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