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Discrepancy between estimated and measured fusion product rates on MAST using TRANSP/NUBEAM
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
Florida Int Univ, Dept Phys, 11200 SW, Miami, FL 33199 USA.
Culham Sci Ctr, Culham Ctr Fus Energy, United Kingdom Atom Energy Author, Abingdon OX14 3DB, Oxon, England.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
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2019 (English)In: Nuclear Fusion, ISSN 0029-5515, E-ISSN 1741-4326, Vol. 59, no 1, article id 016006Article in journal (Refereed) Published
Abstract [en]

Experimental evidence is presented of a discrepancy between the predicted and measured D-D fusion product rates on MAST Both the neutron and proton production rates, measured independently with a neutron camera and charged fusion product detector array, are approximately 40% lower than those predicted by TRANSP/NUBEAM codes. This deficit is scenario independent and cannot be explained by uncertainties in the typical plasma parameters suspected for such discrepancies, such as electron temperature, the plasma effective charge and the injected neutral beam power. Instead, a possible explanation is an overestimate of the neutron emissivity due to the guiding centre approximation used in NUBEAM to model the fast ion orbits.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2019. Vol. 59, no 1, article id 016006
Keywords [en]
spherical tokamak, MAST, fusion product deficit, TRANSP, NUBEAM
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:uu:diva-371111DOI: 10.1088/1741-4326/aaea19ISI: 000450625000002OAI: oai:DiVA.org:uu-371111DiVA, id: diva2:1274188
Funder
Swedish Research CouncilEU, Horizon 2020, 633053Available from: 2018-12-28 Created: 2018-12-28 Last updated: 2018-12-28Bibliographically approved

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Cecconello, MarcoConroy, Sean

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