Abstract Details
| status: | file name: | submitted: | by: |
|---|---|---|---|
| approved | sherwood2025_dudson.pdf | 2025-03-14 12:28:49 | Benjamin Dudson |
Abstracts
Author: Benjamin D Dudson
Requested Type: Poster
Submitted: 2025-03-14 12:28:02
Co-authors: M. Kryjak, T. Ashton-Key, J. Solberg, J.M. Park, C. Collins
Contact Info:
Lawrence Livermore National Laboratory
7000 East Avenue
Livermore, CA 94550
US
Abstract Text:
The boundary of magnetically confined plasmas is a complex environment that has a critical impact on the optimization and operation of high-power fusion devices. Significant gaps in understanding and modeling capabilities remain, limiting the community’s ability to extrapolate to new regimes: The spreading of heat to the divertor and particle fluxes to the first wall; the effect of detachment and divertor configuration on cross-field transport; the L-H transition and access to enhanced confinement regimes. A new generation of tools is required to fill these gaps and enable extrapolation to Fusion Pilot Plant regimes.
To address these gaps we are developing Hermes-3 [1], a multifluid plasma simulation model of transport and turbulence in the edge of magnetically confined plasmas that is built on BOUT++. Hermes-3 is predictive, consistently simulating the evolution of plasma profiles, neutral interactions, and plasma turbulence given heating and fueling inputs.
An Advanced Fluid Neutral model and the immersed boundary (penalization) method [2] have been implemented in Hermes-3, enabling complex boundary shapes to be modeled using structured meshes in FPP-scale devices. We will demonstrate 2D transport simulations in C-AT geometry [3] (R = 4m), using the Cherab ray-tracer to calculate radiation heat loads. Electromagnetic effects have been added and used to simulate 3D turbulence in multiple devices. We will report progress and comparisons to experiment, and a roadmap for open-source development of Hermes-3 as both a transport (2D axisymmetric) and turbulence (3D) model to address boundary modeling needs.
[1] B. Dudson et al. Comp. Phys. Comm. 296, 108991 (2024)
[2] H. Bufferand et al. J. Nucl. Mat. 438, S445-S448 (2013)
[3] R.J. Buttery et al. Nucl. Fusion 61, 046028 (2021)
This work was in part performed under the auspices of the U.S. DoE by LLNL under Contract DE-AC52-07NA27344. Supported by the FREDA SciDAC. LLNL-ABS-2003525.
Characterization: 4.0
Comments:
Could be category 2 (Edge & Divertor) or 4 (Methods)