On the Coupling of Waves for FWCD
2014 (English)In: Radiofrequency power in plasmas, 2014, Vol. 1580, 330-333 p.Conference paper (Refereed)
Coupling of an ICRF antenna to fast magnetosonic waves in a toroidal plasma is studied, considering incomplete damping of waves and passive conducting elements, e.g. conducting limiters, near the antenna. The system is characterized by coupling to a broad spectrum of partially overlapping resonant modes, whose frequency widths are due to finite damping. Small variations of plasma parameters, in particular the plasma density, can change the coupling to individual modes significantly. Therefore, a statistical analysis of the coupling is required. Currents in passive conductors near the antenna, which are induced, in particular by resonant modes, redistribute the coupling to on- and off-resonant modes. A statistical analysis is made to study how coupling to a large set of modes varies with respect to continuous variation of plasma parameters. At low single pass damping it is found that the coupling spectrum can be significantly modified by passive conducting components. This affects the directivity of the launched spectrum, which is important for fast wave current drive (FWCD).
Place, publisher, year, edition, pages
2014. Vol. 1580, 330-333 p.
, AIP Conference Proceedings, ISSN 0094-243X
Fast Wave Current Drive, ICRF, Modeling
IdentifiersURN: urn:nbn:se:kth:diva-149997DOI: 10.1063/1.4864555ISI: 000339626400060ScopusID: 2-s2.0-84906330004ISBN: 978-0-7354-1210-1OAI: oai:DiVA.org:kth-149997DiVA: diva2:741841
20th Topical Conference on Radio Frequency Power in Plasmas, JUN 25-28, 2013, Sorrento, ITALY
QC 201408292014-08-292014-08-292016-09-27Bibliographically approved