X -Point Target Radiator Regime in Tokamak Divertor Plasmas
Year: 2025
Type: article
Abstract: Fusion plasma regimes with a strongly radiating magnetic X point are promising candidates to tackle the outstanding power exhaust challenge in reactor-scale devices. In this Letter, we report on a new type of X-point radiator, the XPTR (X-point target radiator), produced by a secondary X point placed well away from the confined plasma. This XPTR features strongly facilitated detachment access and significantly reduced sensitivity of the radiative front position near the secondary X point. Consistent with a reduced analytical model, the physical origin of X-point radiation is rooted in its magnetic geometry, irrespective of whether the field lines are closed or open. The results presented open up a class of novel power exhaust concepts where radiative edge cooling can be robustly avoided during divertor detachment.
Source: Physical Review Letters
Authors: K. Lee, C. Theiler, M. Carpita, O. Février, A. Perek, M. Zurita, D. Brida, R. Ducker, G. Durr-Legoupil-Nicoud, B. P. Duval, S. Gorno, D. Hamm, D. S. Oliveira, F. Pastore, M. Pedrini, H. Reimerdes, L. Simons, E. Tonello, K. Verhaegh, Y. Wang, C. Wüthrich, the TCV Team and the EUROfusion Tokamak Exploitation Team
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Award: G115085052
OpenAlex ID: W4410157294