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A statistical model of the wave field in a bounded domain
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.
2017 (English)In: Physics of Plasmas, ISSN 1070-664X, E-ISSN 1089-7674, Vol. 24, no 2, 022122Article in journal (Refereed) Published
Abstract [en]

Numerical simulations of plasma heating with radiofrequency waves often require repetitive calculations of wave fields as the plasma evolves. To enable effective simulations, bench marked formulas of the power deposition have been developed. Here, a statistical model applicable to waves with short wavelengths is presented, which gives the expected amplitude of the wave field as a superposition of four wave fields with weight coefficients depending on the single pass damping, as. The weight coefficient for the wave field coherent with that calculated in the absence of reflection agrees with the coefficient for strong single pass damping of an earlier developed heuristic model, for which the weight coefficients were obtained empirically using a full wave code to calculate the wave field and power deposition. Antennas launching electromagnetic waves into bounded domains are often designed to produce localised wave fields and power depositions in the limit of strong single pass damping. The reflection of the waves changes the coupling that partly destroys the localisation of the wave field, which explains the apparent paradox arising from the earlier developed heuristic formula that only a fraction a(s)(2)(2-a(s)) and not as of the power is absorbed with a profile corresponding to the power deposition for the first pass of the rays. A method to account for the change in the coupling spectrum caused by reflection for modelling the wave field with ray tracing in bounded media is proposed, which should be applicable to wave propagation in non-uniform media in more general geometries.

Place, publisher, year, edition, pages
AMER INST PHYSICS , 2017. Vol. 24, no 2, 022122
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-205147DOI: 10.1063/1.4977053ISI: 000396012900028Scopus ID: 2-s2.0-85013944777OAI: oai:DiVA.org:kth-205147DiVA: diva2:1088449
Note

QC 20170412

Available from: 2017-04-12 Created: 2017-04-12 Last updated: 2017-04-12Bibliographically approved

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  • apa
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