First principles of modelling the stabilization of microturbulence by fast ions

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First principles of modelling the stabilization of microturbulence by fast ions

Wilkie, George, 1983 (author): Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden.,Chalmers tekniska högskola,Chalmers University of Technology

Bergsåker, Henric (author): KTH,Fusionsplasmafysik

Bykov, Igor (author): KTH,Fusionsplasmafysik

Frassinetti, Lorenzo (author): KTH,Fusionsplasmafysik

Garcia-Carrasco, Alvaro (author): KTH,Fusionsplasmafysik

Hellsten, Torbjörn (author): KTH,Fusionsplasmafysik

Johnson, Thomas (author): KTH,Fusionsplasmafysik

Menmuir, Sheena (author): KTH,Fusionsplasmafysik

Petersson, Per (author): KTH,Fusionsplasmafysik

Rachlew, Elisabeth, 1944- (author): KTH,Fysik

Ratynskaia, Svetlana (author): KTH,Rymd- och plasmafysik

Rubel, Marek (author): KTH,Fusionsplasmafysik

Stefanikova, Estera (author): KTH,Fusionsplasmafysik

Ström, Petter (author): KTH,Fusionsplasmafysik

Tholerus, Emmi (author): KTH,Fusionsplasmafysik

Tolias, Panagiotis (author): KTH,Rymd- och plasmafysik

Olivares, Pablo Vallejos (author): KTH,Fusionsplasmafysik

Weckmann, Armin (author): KTH,Fusionsplasmafysik

Zhou, Yushun (author): KTH,Fusionsplasmafysik

Zychor, I. (author): Natl Ctr Nucl Res, PL-05400 Otwock, Poland.

Iantchenko, Aylwin, 1993 (author): Ecole Polytechnique Federale de Lausanne (EPFL),Swiss Federal Institute of Technology in Lausanne (EPFL),Chalmers tekniska högskola,Chalmers University of Technology

Abel, Ian, 1985 (author): Chalmers tekniska högskola,Chalmers University of Technology

Hood Highcock, Edmund, 1985 (author): Chalmers tekniska högskola,Chalmers University of Technology

Pusztai, Istvan, 1983 (author): Chalmers tekniska högskola,Chalmers University of Technology

Andersson Sundén, Erik (author): Uppsala universitet,Tillämpad kärnfysik

Binda, F. (author)

Cecconello, Marco (author): Uppsala universitet,Tillämpad kärnfysik

Conroy, Sean (author): Uppsala universitet,Tillämpad kärnfysik

Dzysiuk, N. (author)

Ericsson, Göran (author): Uppsala universitet,Tillämpad kärnfysik

Eriksson, Jacob, Dr, 1985- (author): Uppsala universitet,Tillämpad kärnfysik

Hellesen, C. (author)

Hjalmarsson, Anders (author): Uppsala universitet,Tillämpad kärnfysik

Possnert, Göran, 1951- (author): Uppsala universitet,Högenergifysik,Tillämpad kärnfysik

Sjöstrand, Henrik, 1978- (author): Uppsala universitet,Tillämpad kärnfysik

Skiba, M. (author)

Weiszflog, Matthias (author): Uppsala universitet,Tillämpad kärnfysik

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Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden Chalmers tekniska högskola (creator_code:org_t)

2018-06-29
2018
English.
In: Nuclear Fusion. - : IOP PUBLISHING LTD. - 0029-5515 .- 1741-4326. ; 58:8

Related links:: https://doi.org/10.1...; show more...; https://doi.org/10.1...; https://research.cha... (primary) (free); https://urn.kb.se/re...; https://doi.org/10.1...; https://research.cha...; https://research.cha...; https://urn.kb.se/re...; show less...

Journal article (peer-reviewed)

Abstract Subject headings

The observation that fast ions stabilize ion-temperature-gradient-driven microturbulence has profound implications for future fusion reactors. It is also important in optimizing the performance of present-day devices. In this work, we examine in detail the phenomenology of fast ion stabilization and present a reduced model which describes this effect. This model is derived from the high-energy limit of the gyrokinetic equation and extends the existing 'dilution' model to account for nontrivial fast ion kinetics. Our model provides a physically-transparent explanation for the observed stabilization and makes several key qualitative predictions. Firstly, that different classes of fast ions, depending on their radial density or temperature variation, have different stabilizing properties. Secondly, that zonal flows are an important ingredient in this effect precisely because the fast ion zonal response is negligible. Finally, that in the limit of highly-energetic fast ions, their response approaches that of the 'dilution' model; in particular, alpha particles are expected to have little, if any, stabilizing effect on plasma turbulence. We support these conclusions through detailed linear and nonlinear gyrokinetic simulations.

Subject headings

NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Teknisk mekanik (hsv//swe)
ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Applied Mechanics (hsv//eng)
NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)

Keyword

turbulence
fast ions
stabilization
microturbulence
gyrokinetics
simulation

Publication and Content Type

ref (subject category)
art (subject category)

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NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Fusion Plasma an ...

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Mechanical Engin ...; and Applied Mechanic ...

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Other Physics To ...

Articles in the publication: Nuclear Fusion

By the university: Royal Institute of Technology; Chalmers University of Technology; Uppsala University

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