Abstract Details
Abstracts
Author: Noah R Mandell
Requested Type: Consider for Invited
Submitted: 2025-02-20 15:23:11
Co-authors: W. Guttenfelder, G. Le Bars, L. Singh, A. Bader, K. Camacho Mata, J. M. Canik, L. Carbajal, A. Cerfon, N. M. Davila, W. D. Dorland, C. C. Hegna, C. Holland, D. P. Huet, M. Landreman, C. Lau, A. Malkus, B. Medasani, J. Morrissey, J. C. Schmitt
Contact Info:
Type One Energy Group
299 Washington St, Suite C & E
Woburn, MA 01801
USA
Abstract Text:
As we progress down the stellarator path to a fusion pilot plant (FPP), a key need is the capability to accurately and robustly predict the equilibrium profiles (and hence fusion performance) attainable by a given FPP design configuration. In this work, we use high fidelity transport simulations to predict the energy confinement and fusion performance of Type One Energy’s Infinity Two stellarator FPP concept, a high field stellarator developed using modern optimization techniques. This is accomplished using the recently-developed Trinity3D (T3D) transport modeling framework. T3D leverages multi-scale gyrokinetic theory to efficiently predict macro-scale density and temperature profiles subject to micro-scale turbulent and neoclassical losses, in addition to sources from auxiliary fueling and heating, alpha heating, radiation losses, and collisional energy exchange. For this study, the turbulent fluxes are computed from first-principles nonlinear gyrokinetic simulations using the GX code, and neoclassical fluxes are computed using the SFINCS code.
A pellet fueled operating scenario is proposed that enables supporting an edge density gradient to substantially reduce ion temperature gradient turbulence. Trapped electron mode turbulence is minimized through optimization with maximum-J. We first present high-fidelity nonlinear gyrokinetic simulations to illustrate turbulence characteristics and key parametric dependencies. We then present first-principles transport predictions using the T3D+GX+SFINCS framework. A baseline operating point is predicted with deuterium-tritium fusion power of 800 MW with high fusion gain Q=40, respecting the Sudo density limit and magnetohydrodynamic stability limits. Additional higher power operating points are also predicted, including a fully ignited (Q=infinity) case producing 1.5 GW.
Characterization: 1.0
Comments:
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