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Analysis of a quasilinear model for ion cyclotron interactions in tokamaks
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.ORCID iD: 0000-0002-7142-7103
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.
2006 (English)In: Nuclear Fusion, ISSN 0029-5515, E-ISSN 1741-4326, Vol. 46, no 7, S433-S441 p.Article in journal (Refereed) Published
Abstract [en]

An orbit averaged quasilinear operator for resonant ion cyclotron interactions is analysed. The regions in phase space where the interactions are strong and the boundaries between regions with resonant and non-resonant ion orbits are identified. At these boundaries the quasilinear diffusion coefficient becomes discontinuous, causing the standard Monte Carlo scheme to induce an unphysical flow of test particles into the region with lower diffusion coefficient. A new Monte Carlo scheme that balances the flows across discontinuities is proposed. Moreover, the quasilinear diffusion coefficient is shown to deviate significantly from the lowest order Larmor radius scaling vertical bar delta H vertical bar(2) proportional to v(perpendicular to)(2n), where delta H is the perturbed Hamiltonian. This is not only caused by the finite Larmor radius effects, but also by the inhomogeneous electric field polarization and by the changes to the guiding centre orbits during the wave-particle interactions.

Place, publisher, year, edition, pages
2006. Vol. 46, no 7, S433-S441 p.
Keyword [en]
icrf waves, plasmas, transport, dynamics, orbits, jet
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-15887DOI: 10.1088/0029-5515/46/7/S06ISI: 000239478900007ScopusID: 2-s2.0-33745727676OAI: diva2:333929
QC 20100525 QC 20110927. Conference: 16th Topical Conference on RF Power in Plasmas. Park City, UT. APR, 2005Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2011-09-27Bibliographically approved
In thesis
1. Fast wave heating of cyclotron resonant ions in tokamaks
Open this publication in new window or tab >>Fast wave heating of cyclotron resonant ions in tokamaks
2004 (English)Doctoral thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH, 2004. xiv, 61 p.
Fusion plasma, tokamak, RF heating, fast wave heating, fast wave current drive, ion cyclotron resonance, ICRH, ICRF, ICCD, RF induced rotation, RF induced transport, RF induced pinch, RF pinch, finite orbit width, fast wave current drive, self-consi
National Category
Other Engineering and Technologies
urn:nbn:se:kth:diva-3771 (URN)91-7283-780-2 (ISBN)
Public defence
2004-06-01, 00:00
QC 20100622Available from: 2004-06-01 Created: 2004-06-01 Last updated: 2010-11-15Bibliographically approved

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Johnson, Thomas J.Hellsten, Torbjörn A. K.
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