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Gap eigenmode of radially localised helicon waves in a periodic structure | | Lei Chang
; Boris N. Breizman
; Matthew J. Hole
; | | Date: |
19 Oct 2012 | | Abstract: | An ElectroMagnetic Solver (EMS) [Chen et al., Phys. Plasmas, 13, 123507
(2006)] is employed to model a spectral gap and a gap eigenmode in a periodic
structure in the whistler frequency range. A Radially Localised Helicon (RLH)
mode [Breizman and Arefiev, Phys. Rev. Lett, 84, 3863 (2000)] is considered. We
demonstrate that the computed gap frequency and gap width agree well with a
theoretical analysis, and find a discrete eigenmode inside the gap by
introducing a defect to the system’s periodicity. The axial wavelength of the
gap eigenmode is close to twice the system’s periodicity, which is consistent
with Bragg’s law. Such an eigenmode could be excited by energetic electrons,
similar to the excitation of Toroidal Alfv’{e}n Eigenmodes (TAE) by energetic
ions in tokamaks. | | Source: | arXiv, 1210.5284 | | Services: | Forum | Review | PDF | Favorites | |
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