Simulation of injector dynamics during steady inductive helicity injection current drive in the HIT-SI experiment

Hansen, Chris; Marklin, George; Victor, Brian; Akcay, Cihan; Jarboe, Thomas

doi:10.1063/1.4917476

Simulation of injector dynamics during steady inductive helicity injection current drive in the HIT-SI experiment

Journal Article · Fri Apr 10 00:00:00 EDT 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4917476· OSTI ID:1608230

^[1]; Marklin, George ^[2]; ^[3]; Akcay, Cihan ^[4]; ^[5]

Univ. of Washington, Seattle, WA (United States). PSI-Center; Columbia Univ., New York, NY (United States); University of Washington
Univ. of Washington, Seattle, WA (United States). PSI-Center
Univ. of Washington, Seattle, WA (United States). HIT-SI Group
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of Washington, Seattle, WA (United States). HIT-SI Group and PSI-Center

We present simulations of inductive helicity injection in the Helicity Injected Torus with Steady Inductive helicity injection (HIT-SI) device that treats the entire plasma volume in a single dynamic MHD model. A new fully 3D numerical tool, the PSI-center TETrahedral mesh code, was developed that provides the geometric flexibility required for this investigation. Implementation of a zero-β Hall MHD model using PSI-TET will be presented including formulation of a new self-consistent magnetic boundary condition for the wall of the HIT-SI device. Results from simulations of HIT-SI are presented focusing on injector dynamics that are investigated numerically for the first time. Asymmetries in the plasma loading between the two helicity injectors and progression of field reversal in each injector are observed. Analysis indicates cross-coupling between injectors through confinement volume structures. Injector impedance is found to scale with toroidal current at fixed density, consistent with experimental observation. Comparison to experimental data with an injector drive frequency of 14.5 kHz shows good agreement with magnetic diagnostics. Global mode structures from Bi-Orthogonal decomposition agree well with experimental data for the first four modes.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of California, Berkeley, CA (United States); Univ. of Washington, Seattle, WA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)

Contributing Organization:: National Energy Research Scientific Computing Center (NERSC)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1608230

Alternate ID(s):: OSTI ID: 1228295
OSTI ID: 22408314

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 4 Vol. 22; ISSN PHPAEN; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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