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A Fokker-Planck Code for Fast Self-Consistent Calculations of ICRH
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.ORCID iD: 0000-0002-7142-7103
2010 (English)In: 37th EPS Conference on Plasma Physics, 2010Conference paper, Published paper (Other academic)
Abstract [en]

Modeling of ion cyclotron resonant heating, ICRH, requires self-consistent modeling of the distribution function of the resonant ion species and the wave field. A method has been devised for fast self-consistent calculation of the distribution function and the wave field for ICRH modeling. The distribution function is obtained by solving a pitch angle averaged 1D time dependent Fokker Planck equation that includes the Coulomb collision and quasi-linear operators. The quasi-linear operators describing the wave-particle interactions are obtained from the LION code [1]. The time dependent 1D Fokker-Planck equation solved with a cubic finite element method will be presented in this report. The modifications of the susceptibility tensors of the resonant ion species due to changes of the distribution functions caused by heating are calculated by the Fokker-Planck solver and then used in the LION code for calculating the modified wave field

Place, publisher, year, edition, pages
2010.
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:kth:diva-119989Scopus ID: 2-s2.0-84875686004OAI: oai:DiVA.org:kth-119989DiVA: diva2:613146
Conference
37th EPS Conference on Plasma Physics
Note

QC 20130326

Available from: 2013-03-26 Created: 2013-03-26 Last updated: 2013-03-27Bibliographically approved
In thesis
1. Modelling Ion Cyclotron Resonance Heating and Fast Wave Current Drive in Tokamaks
Open this publication in new window or tab >>Modelling Ion Cyclotron Resonance Heating and Fast Wave Current Drive in Tokamaks
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Fast magnetosonic waves in the ion cyclotron range of frequencies have the potential to heat plasma and drive current in a thermonuclear fusion reactor. A code, SELFO-light, has been developed to study the physics of ion cyclotron resonantheating and current drive in thermonuclear fusion reactors. It uses a global full wave solver LION and a new 1D Fokker-Planck solver for the self-consistent calculations of the wave field and the distribution function of ions.In present day tokamak experiments like DIII-D and JET, fast wave damping by ions at higher harmonic cyclotron frequencies is weak compared to future thermonuclear tokamak reactors like DEMO. The strong damping by deuterium, tritium and thermonuclear alpha-particles and the large Doppler width of fast alpha-particles in DEMO makes it difficult to drive the current when harmonic resonance layers of these ionspecies are located at low field side of the magnetic axis. At higher harmonic frequencies the possibility of fast wave current drive diminishes due to the overlapping of alpha-particle harmonic resonance layers. Narrow frequency bands suitable for the fast wave current drive in DEMO have been identified at lower harmonics of the alpha-particles. For these frequencies the effect of formation of high-energy tails in the distribution function of majority and minority ion species on the current drive have been studied. Some of these frequencies are found to provide efficient ion heating in the start up phase of DEMO. The spectrum where efficient current drive can be obtained is restricted due to weak electron damping at lower toroidal mode numbers and strong trapped electron damping at higher toroidal mode numbers. The width of toroidal mode spectra for which efficient current drive can be obtained have been identified, which has important implications for the antenna design.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2013. xii, 53 p.
Series
TRITA-EE, ISSN 1653-5146 ; 2013:013
Keyword
Thermonuclear fusion, Tokamak, DIII-D, JET, ITER, DEMO, ICRF, ICRH, Fast magnetosonic waves, TTMP, ELD, ICRH, Thermonuclear
National Category
Fusion, Plasma and Space Physics
Identifiers
urn:nbn:se:kth:diva-119930 (URN)978-91-7501-692-4 (ISBN)
Public defence
2013-04-23, Sal F3, Lindstedsvägen 26, KTH, Stockholm, 14:00 (English)
Opponent
Supervisors
Note

QC 20130327

Available from: 2013-03-27 Created: 2013-03-25 Last updated: 2014-08-29Bibliographically approved

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Johnson, Thomas

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