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Analysis of a quasilinear model for ion cyclotron interactions in tokamaks
KTH, Skolan för elektro- och systemteknik (EES), Fusionsplasmafysik.ORCID-id: 0000-0002-7142-7103
KTH, Skolan för elektro- och systemteknik (EES), Fusionsplasmafysik.
2006 (engelsk)Inngår i: Nuclear Fusion, ISSN 0029-5515, E-ISSN 1741-4326, Vol. 46, nr 7, s. S433-S441Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
2006. Vol. 46, nr 7, s. S433-S441
Emneord [en]
icrf waves, plasmas, transport, dynamics, orbits, jet
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-15887DOI: 10.1088/0029-5515/46/7/S06ISI: 000239478900007Scopus ID: 2-s2.0-33745727676OAI: oai:DiVA.org:kth-15887DiVA, id: diva2:333929
Merknad
QC 20100525 QC 20110927. Conference: 16th Topical Conference on RF Power in Plasmas. Park City, UT. APR, 2005Tilgjengelig fra: 2010-08-05 Laget: 2010-08-05 Sist oppdatert: 2017-12-12bibliografisk kontrollert
Inngår i avhandling
1. Fast wave heating of cyclotron resonant ions in tokamaks
Åpne denne publikasjonen i ny fane eller vindu >>Fast wave heating of cyclotron resonant ions in tokamaks
2004 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
sted, utgiver, år, opplag, sider
Stockholm: KTH, 2004. s. xiv, 61
Emneord
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
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-3771 (URN)91-7283-780-2 (ISBN)
Disputas
2004-06-01, 00:00
Merknad
QC 20100622Tilgjengelig fra: 2004-06-01 Laget: 2004-06-01 Sist oppdatert: 2010-11-15bibliografisk kontrollert

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