Abstract Details
Abstracts
Author: Saurabh Saxena
Requested Type: Consider for Invited
Submitted: 2025-02-21 13:34:39
Co-authors: N.Ferraro, M.Martin
Contact Info:
Princeton Plasma Physics Laboratory
100 Stellarator Rd
Princeton, NJ 08540
USA
Abstract Text:
Bootstrap current often plays a crucial role in determining the equilibrium and stability of magnetic confinement devices, particularly in quasisymmetric (QS) stellarators and tokamaks. This current, which is driven by gradients in pressure and temperature, can represent a significant or dominant contribution to the plasma current, and can strongly affect the rotational transform of the magnetic field in the plasma. When modeling the evolution of the plasma equilibrium using nonlinear extended-MHD models, it is necessary to include the bootstrap current in these configurations in order to assess MHD stability thresholds accurately. To enhance our ability to model these effects, we extend the capabilities of M3D-C1, an extended-MHD code, to include self-consistent models for bootstrap current, implementing both a generalized Sauter model [1] and a revised Sauter-like model [2]. Using the isomorphism framework described by Landreman [3], these models are applied to QS configurations including NCSX and new precise-QA configurations [3]. The new implementation is benchmarked against neoclassical codes such as NEO, XGCa, and SFINCS, demonstrating that M3D-C1 is now capable of self-consistently calculating the kinetic contributions to plasma current in both tokamaks and QS stellarators.
[1] Sauter, O., Angioni, C., & Lin-Liu, Y. R. Phys. of Plasmas, 6, 2834(1999)
[2] Redl, A., et al.. Phys. Plasmas 28, 022502 (2021)
[3] Landreman, Buller, and Drevlak, Phys. Plasmas 29, 082501 (2022)
Characterization: 4.0
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