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A new mechanism for increasing density peaking in tokamaks: improvement of the inward particle pinch with edge E x B shearing
CEA, IRFM, F-13108 St Paul Les Durance, France.;EUROfus Consortium JET, Culham Sci Ctr, Abingdon OX14 3DB, Oxon, England.;CEA, IRFM, F-13108 St Paul Les Durance, France..
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: 12482019 (English)In: Plasma Physics and Controlled Fusion, ISSN 0741-3335, E-ISSN 1361-6587, Vol. 61, no 10, article id 104002Article in journal (Refereed) Published
Abstract [en]

Developing successful tokamak operation scenarios, as well as confident extrapolation of present-day knowledge requires a rigorous understanding of plasma turbulence, which largely determines the quality of the confinement. In particular, accurate particle transport predictions are essential due to the strong dependence of fusion power or bootstrap current on the particle density details. Here, gyrokinetic turbulence simulations are performed with physics inputs taken from a JET power scan, for which a relatively weak degradation of energy confinement and a significant density peaking is obtained with increasing input power. This way physics parameters that lead to such increase in the density peaking shall be elucidated. While well-known candidates, such as the collisionality, previously found in other studies are also recovered in this study, it is furthermore found that edge E x B shearing may adopt a crucial role by enhancing the inward pinch. These results may indicate that a plasma with rotational shear could develop a stronger density peaking as compared to a non-rotating one, because its inward convection is increased compared to the outward diffusive particle flux as long as this rotation has a significant on E x B flow shear stabilization. The possibly significant implications for future devices, which will exhibit much less torque compared to present day experiments, are discussed.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2019. Vol. 61, no 10, article id 104002
Keywords [en]
turbulence, transport, plasma
National Category
Physical Sciences
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URN: urn:nbn:se:kth:diva-269145DOI: 10.1088/1361-6587/ab31a4ISI: 000482602800002OAI: oai:DiVA.org:kth-269145DiVA, id: diva2:1413974
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QC 20200311

Available from: 2020-03-11 Created: 2020-03-11 Last updated: 2020-03-12Bibliographically approved

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Bergsåker, HenrikBykov, IgorFrassinetti, LorenzoFridström, RichardGarcia Carrasco, AlvaroHellsten, TorbjörnJohnson, ThomasMoon, SunwooRachlew, ElisabethRatynskaia, SvetlanaRubel, MarekStefániková, EsteraStröm, PetterTholerus, EmmiTolias, PanagiotisOlivares, Pablo VallejosWeckmann, Armin
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