Abstract Details
Abstracts
Author: Daniel A. Burgess
Requested Type: Poster
Submitted: 2025-03-13 14:51:18
Co-authors: N.C. Logan, C. Paz-Soldan, J.K. Park
Contact Info:
Columbia University
71 Sutton St, Apt 3
Brooklyn, NY 11222
USA
Abstract Text:
We have developed a new tearing mode (TM) stability workflow that solves the resistive inner layer equations in a plasma slab to yield a linear, quasi-toroidal TM growth rate. Classical tearing stability is a function of the tearing stability index Δ’, but the linear growth phase at the rational surface is significantly affected by the kinetic properties of the plasma. Our workflow combines two-fluid and drift MHD effects in a slab approximation of the resistive inner layer (SLAYER) with a toroidal Δ’ from the STRIDE code that incorporates shaping effects. This workflow is rapid and numerically robust across all reactor-relevant plasma conditions tested, and yields growth rates that closely align with analytic predictions across well documented linear growth rate regimes. Using model equilibria, we analyzed the stability characteristics of the m=2, n=1 mode across a range of plasma conditions by self-consistently scanning parameters such as the toroidal current gradient, resistivity, normalized β, and aspect ratio. Inclusion of curvature effects at the resistive layer is planned for a future update. This capability to quickly and robustly predict classical tearing stability in tokamaks will facilitate the mapping of TM stable operational regimes and design of safe discharge trajectories in future devices.
Research supported by US DOE under DE-SC0022272 and by Commonwealth Fusion Systems.
Characterization: 1.0
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