<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>X</mml:mi></mml:math>-Point Target Radiator Regime in Tokamak Divertor Plasmas
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.
Authors
- D. Brida (ORCID: https://orcid.org/0000-0002-8647-7058)
- K. Lee (ORCID: https://orcid.org/0000-0002-5608-3015)
- D. Hamm
- L. Simons (ORCID: https://orcid.org/0000-0002-5838-5076)
- E. Tonello (ORCID: https://orcid.org/0000-0001-8335-8873)
- F. Pastore (ORCID: https://orcid.org/0009-0000-6009-326X)
- Y.S. Wang (ORCID: https://orcid.org/0009-0004-5888-2277)
- D.S. Oliveira (ORCID: https://orcid.org/0000-0002-6888-2594)
- H. Reimerdes (ORCID: https://orcid.org/0000-0002-9726-1519)
- M. Carpita (ORCID: https://orcid.org/0009-0006-3481-5197)
- C. Theiler (ORCID: https://orcid.org/0000-0003-3926-1374)
- C. Wüthrich (ORCID: https://orcid.org/0000-0001-7548-2452)
- B.P. Duval (ORCID: https://orcid.org/0000-0001-7783-129X)
- S. Gorno (ORCID: https://orcid.org/0000-0003-0524-7283)
- A. Perek (ORCID: https://orcid.org/0000-0002-4117-0298)
- M. Zurita (ORCID: https://orcid.org/0000-0002-9030-0423)
- O. Février (ORCID: https://orcid.org/0000-0002-9290-7413)
- M Pedrini (ORCID: https://orcid.org/0009-0007-8168-2312)
- Richard Ducker (ORCID: https://orcid.org/0009-0004-3892-9963)
- K. Verhaegh (ORCID: https://orcid.org/0000-0002-0500-2764)
- G. Durr-Legoupil-Nicoud (ORCID: https://orcid.org/0009-0002-5956-6482)
Institutions
- Max Planck Institute for Plasma Physics (DE)
- United Kingdom Atomic Energy Authority (GB)
- École Polytechnique Fédérale de Lausanne (CH)
Publication Details
- Journal
- Physical Review Letters
- Published
- 2025-05-07
- DOI
- https://doi.org/10.1103/physrevlett.134.185102
- Citations
- 4
- Primary Topic
- Magnetic confinement fusion research
- Type
- article
- Field-Weighted Citation Impact
- 7.48
Funders
- Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
- Euratom Research and Training Programme
- Staatssekretariat für Bildung, Forschung und Innovation