Abstract
Using a single toroidal array of coils to reduce the m , n = 2 , 1 resonant error field (EF) produced by the misalignment of the axisymmetric coils in SPARC can result in the enhancement of the local divertor heat fluxes. Managing high divertor heat fluxes ( q ∥ ≃ 10 GW m−2) poses a challenge for compact tokamak devices such as SPARC. The presence of non-axisymmetric magnetic field perturbations adds complexity to the problem by generating intricate 3D edge magnetic topologies that alter the heat flux distributions on the target plates. The aim of this work is to investigate the impact of the EF correction (EFC) on the heat fluxes at the divertor plates in SPARC. The MHD code M3DC1 has been used to simulate the 3D magnetic perturbations generated by the shift and tilt of several axisymmetric coils within specified tolerances, as well as from the array of EFC coils located at the midplane. Using a heuristic model that extends the concept of an axisymmetric heat flux layer to 3D plasmas, the resultant heat flux distributions is derived from magnetic footprints calculated with the MAFOT code. The results show that the EFC could either decrease or further enhance the local heat flux when used to correct the m , n = 2 , 1 resonant EF to enhance the core plasma performance.
| Original language | English |
|---|---|
| Article number | 046007 |
| Journal | Nuclear Fusion |
| Volume | 65 |
| Issue number | 4 |
| DOIs | |
| State | Published - Apr 1 2025 |
Funding
This material is based upon work supported by the US Department of Energy, Office of Science, Office of Fusion Energy Sciences, under Awards DE-AC02-09CH11466 and DE-AC05-00OR22725. This work is supported in part by Commonwealth Fusion Systems. The United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The data that supports the findings of this study are openly available at [40]. This material is based upon work supported by the US Department of Energy, Office of Science, Office of Fusion Energy Sciences, under Awards DE-AC02-09CH11466 and DE-AC05-00OR22725. This work is supported in part by Commonwealth Fusion Systems. The United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The data that supports the findings of this study are openly available at [].
Keywords
- 3D fields
- MHD
- SPARC
- footprints
- heat fluxes
- plasma response