Gyrokinetic total distribution simulations of drift-wave turbulence and neo-classical dynamics in tokamaks with Elmfire

S. Janhunen, Jukka A. Heikkinen, S. Leerink, T. Kiviniemi, T. Korpilo

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

One of the outstanding problems of transport processes in tokamaks is the L-H transition and in general transport barrier formation, explanation of which has attracted several possible hypotheses ranging from purely neo-classical (rotational runaway) to non-linear (modulational) instabilities between turbulent eddies and zonal flows. Total ƒ gyrokinetic simulation allows for the investigation of all the most important transport processes simultaneously, or by distinguishing between neo-classical and turbulent mechanisms in flow generation and transport. Elmfire is a gyrokinetic 5D total distribution simulation capable of transport time scale simulations of a multi-species plasma with self-consistent evolution of microturbulence, neo-classical physics and large scale structures. Generally gyrokinetic investigations of neo-classical processes have been obtained potential ux surface averaging, eliminating all modes except the (0; 0) zonal mode in simulations. We present an improved model for gyrokinetic particle simulations of neo-classical physics. We also discuss theoretical aspects of the gyrokinetic theory which includes the polarization drift in particle equations of motion, and present conservation of total angular momentum and energy in Elmfire . The role of sampling error is investigated, and the effect of noise on long time scale evolution of the system.
Original languageEnglish
Title of host publicationProgramme, Abstracts, Presentations & Proceedings
Subtitle of host publication24th IAEA Fusion Energy Conference, October 8-13, 2012, San Diego, USA
PublisherInternational Atomic Energy Agency IAEA
Number of pages8
Publication statusPublished - 2012
MoE publication typeA4 Article in a conference publication
Event24th IAEA Fusion Energy Conference - San Diego, United States
Duration: 8 Oct 201213 Oct 2012
http://www-naweb.iaea.org/napc/physics/FEC/FEC2012/html/proceedings.pdf (Full proceedings)

Conference

Conference24th IAEA Fusion Energy Conference
CountryUnited States
CitySan Diego
Period8/10/1213/10/12
Internet address

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turbulence
simulation
physics
conservation
equations of motion
angular momentum
sampling
vortices
polarization
energy

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Janhunen, S., Heikkinen, J. A., Leerink, S., Kiviniemi, T., & Korpilo, T. (2012). Gyrokinetic total distribution simulations of drift-wave turbulence and neo-classical dynamics in tokamaks with Elmfire. In Programme, Abstracts, Presentations & Proceedings: 24th IAEA Fusion Energy Conference, October 8-13, 2012, San Diego, USA [TH/P7-05] International Atomic Energy Agency IAEA.
Janhunen, S. ; Heikkinen, Jukka A. ; Leerink, S. ; Kiviniemi, T. ; Korpilo, T. / Gyrokinetic total distribution simulations of drift-wave turbulence and neo-classical dynamics in tokamaks with Elmfire. Programme, Abstracts, Presentations & Proceedings: 24th IAEA Fusion Energy Conference, October 8-13, 2012, San Diego, USA. International Atomic Energy Agency IAEA, 2012.
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Janhunen, S, Heikkinen, JA, Leerink, S, Kiviniemi, T & Korpilo, T 2012, Gyrokinetic total distribution simulations of drift-wave turbulence and neo-classical dynamics in tokamaks with Elmfire. in Programme, Abstracts, Presentations & Proceedings: 24th IAEA Fusion Energy Conference, October 8-13, 2012, San Diego, USA., TH/P7-05, International Atomic Energy Agency IAEA, 24th IAEA Fusion Energy Conference, San Diego, United States, 8/10/12.

Gyrokinetic total distribution simulations of drift-wave turbulence and neo-classical dynamics in tokamaks with Elmfire. / Janhunen, S.; Heikkinen, Jukka A.; Leerink, S.; Kiviniemi, T.; Korpilo, T.

Programme, Abstracts, Presentations & Proceedings: 24th IAEA Fusion Energy Conference, October 8-13, 2012, San Diego, USA. International Atomic Energy Agency IAEA, 2012. TH/P7-05.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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AU - Korpilo, T.

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AB - One of the outstanding problems of transport processes in tokamaks is the L-H transition and in general transport barrier formation, explanation of which has attracted several possible hypotheses ranging from purely neo-classical (rotational runaway) to non-linear (modulational) instabilities between turbulent eddies and zonal flows. Total ƒ gyrokinetic simulation allows for the investigation of all the most important transport processes simultaneously, or by distinguishing between neo-classical and turbulent mechanisms in flow generation and transport. Elmfire is a gyrokinetic 5D total distribution simulation capable of transport time scale simulations of a multi-species plasma with self-consistent evolution of microturbulence, neo-classical physics and large scale structures. Generally gyrokinetic investigations of neo-classical processes have been obtained potential ux surface averaging, eliminating all modes except the (0; 0) zonal mode in simulations. We present an improved model for gyrokinetic particle simulations of neo-classical physics. We also discuss theoretical aspects of the gyrokinetic theory which includes the polarization drift in particle equations of motion, and present conservation of total angular momentum and energy in Elmfire . The role of sampling error is investigated, and the effect of noise on long time scale evolution of the system.

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Janhunen S, Heikkinen JA, Leerink S, Kiviniemi T, Korpilo T. Gyrokinetic total distribution simulations of drift-wave turbulence and neo-classical dynamics in tokamaks with Elmfire. In Programme, Abstracts, Presentations & Proceedings: 24th IAEA Fusion Energy Conference, October 8-13, 2012, San Diego, USA. International Atomic Energy Agency IAEA. 2012. TH/P7-05