TCV TeamEUROfusion Tokamak Exploitation TeamLee, K.Theiler, C.Carpita, M.Février, O.Perek, A.Zurita, M.Brida, D.Ducker, R.Durr-Legoupil-Nicoud, G.Duval, B. P.Gorno, S.Hamm, D.Oliveira, D. S.Pastore, F.Pedrini, M.Reimerdes, H.Simons, L.Tonello, E.Verhaegh, K.Wang, Y.Wüthrich, C.2025-05-092025-05-092025-05-082025-05-0710.1103/physrevlett.134.185102https://infoscience.epfl.ch/handle/20.500.14299/249989Fusion 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.enMagnetic confinement fusionNuclear fusionPlasma fusionPlasma-wall interactionsFusion reactorsMagnetically confined plasmasTokamakstext::journal::journal article::research article