Lee 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
École Polytechnique Fédérale de Lausanne (EPFL), Swiss Plasma Center (SPC), CH-1015 Lausanne, Switzerland.
Max Planck Institute for Plasma Physics, Boltzmannstrasse 2, 85748 Garching, Germany.
Phys Rev Lett. 2025 May 9;134(18):185102. doi: 10.1103/PhysRevLett.134.185102.
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.
具有强辐射磁X点的聚变等离子体状态是解决反应堆规模装置中突出的功率排出挑战的有前途的候选方案。在本快报中，我们报告了一种新型的X点辐射器，即XPTR（X点靶辐射器），它由远离约束等离子体放置的次级X点产生。这种XPTR具有显著促进脱靶的特性，并且次级X点附近辐射前沿位置的灵敏度显著降低。与简化的分析模型一致，X点辐射的物理起源源于其磁几何结构，而与磁力线是闭合还是开放无关。所呈现的结果开创了一类新颖的功率排出概念，即在偏滤器脱靶期间可以可靠地避免辐射边缘冷却。
