2D electron density profile evolution during detachment in Super-X divertor L-mode discharges on MAST-U
Plasma Physics
2025-07-02 v2
Abstract
2D electron density profiles obtained from coherence imaging spectroscopy in different MAST-U divertor conditions are compared. The data includes variations of strike point position, core electron density, and heating power. The improved performance of the long-legged divertors results in a lower electron density and particle flux at the target compared to configurations with smaller strike point major radius, while also being characterized by lower temperatures and deeper detachment. Comparisons against SOLPS simulations generally show good agreement in profile shape along and across the separatrix. The peaking of the electron density downstream of the detachment front is associated with significant neutral drag acting on the plasma flow.
Cite
@article{arxiv.2410.00818,
title = {2D electron density profile evolution during detachment in Super-X divertor L-mode discharges on MAST-U},
author = {N. Lonigro and R. S. Doyle and K. Verhaegh and B. Lipschultz and D. Moulton and P. Ryan and J. S. Allcock and C. Bowman and D. Brida and J. Harrison and S. Silburn and C. Theiler and T. A. Wijkamp and the WPTE Team and MAST-U Team},
journal= {arXiv preprint arXiv:2410.00818},
year = {2025}
}