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Edge localized magnetosonic eigenmodes in the ion cyclotron frequency range
KTH, Superseded Departments, Alfvén Laboratory.
KTH, Superseded Departments, Alfvén Laboratory.
2003 (English)In: Physics of Plasmas, ISSN 1070-664X, E-ISSN 1089-7674, Vol. 10, no 11, 4371-4377 p.Article in journal (Refereed) Published
Abstract [en]

Edge localized magnetosonic modes are analyzed in toroidal plasmas. For low and medium high toroidal mode numbers they are found to propagate poloidally around the plasma. A model of these modes is developed and benchmarked against a global wave code. The eigenvalues are found to be almost independent of the aspect ratio for constant minor radius, but sensitive to the ellipticity. Magnetosonic modes localized to an annular region in the poloidal plane have been proposed as an explanation for ion cyclotron emission from the edge and strongly localized mode conversion. The appearance of such modes will also give rise to parasitic absorption at the edge during ion cyclotron resonance heating.

Place, publisher, year, edition, pages
2003. Vol. 10, no 11, 4371-4377 p.
Keyword [en]
emission, instability, plasmas, tokamaks, products, waves
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:kth:diva-12767DOI: 10.1063/1.1617315ISI: 000185989400021OAI: oai:DiVA.org:kth-12767DiVA: diva2:318755
Note
QC 20100510Available from: 2010-05-10 Created: 2010-05-10 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Fast wave heating and current drive in tokamaks
Open this publication in new window or tab >>Fast wave heating and current drive in tokamaks
2005 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

This thesis concerns heating and current drive in tokamak plasmas using the fast magnetosonic wave in the ion cyclotron range of frequencies. Fast wave heating is a versatile heating method for thermonuclear fusion plasmas and can provide both ion and electron heating and non-inductive current drive. Predicting and interpreting realistic heating scenarios is however difficult due to the coupled evolution of the cyclotron resonant ion velocity distributions and the wave field. The SELFO code, which solves the coupled wave equation and Fokker-Planck equation for cyclotron resonant ion species in a self-consistent manner, has been upgraded to allow the study of more advanced fast wave heating and current drive scenarios in present day experiments and in preparation for the ITER tokamak.

Theoretical and experimental studies related to fast wave heating and current drive with emphasis on fast ion effects are presented. Analysis of minority ion cyclotron current drive in ITER indicates that the use of a hydrogen minority rather than the proposed helium-3 minority results in substantially more efficient current drive. The parasitic losses of power to fusion born alpha particles and beam injected ions are concluded to be acceptably low. Experiments performed at the JET tokamak on polychromatic ion cyclotron resonance heating and on fast wave electron current drive are presented and analysed. Polychromatic heating is demonstrated to increase the bulk plasma ion to electron heating ratio, in line with theoretical expectations, but the fast wave electron current drive is found to be severely degraded by parasitic power losses outside of the plasma. A theoretical analysis of parasitic power losses at radio frequency antennas indicates that the losses can be significantly increased in scenarios with low wave damping and with narrow antenna spectra, such as in electron current drive scenarios.

Place, publisher, year, edition, pages
Stockholm: KTH, 2005. xiv, 42 p.
Keyword
Tokamak, JET, ITER, thermonuclear fusion, fast wave, heating, current drive, ion cyclotron resonance, polychromatic, finite orbit widths, RF-induced transport, neutral beam injection, fusion born alpha particles, magnetosonic eigenmodes, parasitic absorption, modelling, weighted Monte Carlo scheme, Fysik
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-118 (URN)91-7283-954-6 (ISBN)
Public defence
2005-02-08, Kollegiesalen, Valhallavägen 79, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20100506Available from: 2005-02-04 Created: 2005-02-04 Last updated: 2011-02-24Bibliographically approved

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