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A power-balance model of the density limit in fusion plasmas: application to the L-mode tokamak
Univ Padua, Acciaierie Veneto Spa, INFN, Consorzio RFX,CNR,ENEA, Padua, Italy..
KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Fusion Plasma Physics.
KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Fusion Plasma Physics.
KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Fusion Plasma Physics.
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Number of Authors: 12252019 (English)In: Nuclear Fusion, ISSN 0029-5515, E-ISSN 1741-4326, Vol. 59, no 12, article id 126011Article in journal (Refereed) Published
Abstract [en]

A power-balance model, with radiation losses from impurities and neutrals, gives a unified description of the density limit (DL) of the stellarator, the L-mode tokamak, and the reversed field pinch (RFP). The model predicts a Sudo-like scaling for the stellarator, a Greenwald- like scaling, alpha I-p(8/9), for the RFP and the ohmic tokamak, a mixed scaling, alpha (PIp4/9)-I-4/9, for the additionally heated L-mode tokamak. In a previous paper (Zanca et al 2017 Nucl. Fusion 57 056010) the model was compared with ohmic tokamak, RFP and stellarator experiments. Here, we address the issue of the DL dependence on heating power in the L-mode tokamak. Experimental data from high-density disrupted L-mode discharges performed at JET, as well as in other machines, arc taken as a term of comparison. The model fits the observed maximum densities better than the pure Greenwald limit.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2019. Vol. 59, no 12, article id 126011
Keywords [en]
magnetohydrodynamics, transport, radiation
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-269131DOI: 10.1088/1741-4326/ab3b31ISI: 000488059900001OAI: oai:DiVA.org:kth-269131DiVA, id: diva2:1414332
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QC 20200312

Available from: 2020-03-12 Created: 2020-03-12 Last updated: 2020-03-12Bibliographically approved

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Bergsåker, HenrikBykov, IgorFrassinetti, LorenzoGarcia Carrasco, AlvaroHellsten, TorbjörnJohnson, ThomasRachlew, ElisabethRatynskaia, SvetlanaRubel, MarekStefániková, EsteraStröm, PetterTholerus, EmmiTolias, PanagiotisOlivares, Pablo VallejosWeckmann, Armin
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