Abstract Details
Abstracts
Author: Marcos X Navarro Gonzalez
Requested Type: Consider for Invited
Submitted: 2026-03-09 09:53:51
Co-authors: Qiming Hu, Huiqian Wang, Heinke Frerichs, Oliver Schmitz
Contact Info:
University of Wisconin-Madison
1500 Engineering Drive
Madison, WI 53706
USA
Abstract Text:
EMC3-EIRENE modeling of detachment of 3D scenarios at DIII-D with resonant magnetic perturbations applied show that neon as a seeded impurity is able to semi-detach the ITER similar shape at comparatively lower separatrix impurity densities (1e18 m-3) than seeded nitrogen (2e18 m-3). This impurity buildup is observed on the low-field side at the DIII-D lower divertor shelf, leading to detachment of the far scrape-off layer (SOL), and remaining semi-attached at the strike line near the lower pumping gap on the floor. In the near SOL, there is neutral pressure buildup occurring for main ion species (D) densities with deep detachment observed for higher separatrix densities (5e19 m-3), though not within the observed ELM suppression window. The simulations are being compared to experiments in which extrinsic impurities were used to study the impact on the SOL and exhaust of such species in ELM suppressed scenarios at DIII-D. As a way to efficiently pump out these impurities, it is necessary to identify global transport dynamics for them as well as identifying safe operational limits for the wall components. In addition, a coupled analysis to the 3D kinetic Monte Carlo code ERO2.0 shows the effects of including helium in the simulations on plasma wall interactions, with He2+ being the main contributor to erosion (from other He charge states) on the divertor targets at DIII-D. Charge state resolved fluxes have been mapped onto target surfaces to resolve the spatial distribution of the species in the 3D equilibria. In order to be able to accurately model impurity transport in the far SOL, wide grids have been generated in EMC3-EIRENE in order to provide a self-consistent solution of erosion and impurity transport when coupled to ERO2.0.
This work was funded by Department of Energy, Office of Fusion Energy Science, DE-SC0020284, DE-FC02-04ER54698, DE-AC52-07NA27344 and DE-AC02-09CH11466.
Characterization: 2.0
Comments: