Abstract Details
Abstracts
Author: Stuart R. Benjamin
Requested Type: Poster
Submitted: 2025-03-14 15:21:31
Co-authors: C. Rea, Z. Keith, N. Logan, C. Hansen, E. Howell
Contact Info:
Massachusetts Institute of Technology
167 Albany Street
Cambridge, MA 02139
USA
Abstract Text:
Despite decades of tearing research in tokamaks, the path to stabilising the neoclassical tearing mode (NTM) in fully-inductive high-field tokamak power plants remains obscure. In this work, we attempt to exhaust the MHD-understanding of this instability in the context of ARC pilot-plant design decisions. 7422 high-field, simple tokamak geometries were Monte-Carlo sampled and normalised to the same Pfus > 400MW, minimum pressure scenario at a range of plasma currents. ARC-like H-mode equilibria of these scenarios were solved with self-consistent bootstrap currents, before tearing analysis using the modified Rutherford equation was applied for all poloidal and toroidal m,n modes up to n = 4. The minimum marginally stable island width was compared across all linearly stable scenarios, and found to strongly depend upon the choice of input geometry; an order of magnitude improvement in NTM seeding resistance was predicted for devices with low-elongation and/or large minor radii.
Characterization: 1.0
Comments: