Electron–cyclotron damping of helicon waves in low diverging magnetic fields | Zendy

Trevor Lafleur | Zendy; Christine Charles | Zendy; R. W. Boswell | Zendy

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Electron–cyclotron damping of helicon waves in low diverging magnetic fields

Author(s) -

Trevor Lafleur,

Christine Charles,

R. W. Boswell

Publication year - 2011

Publication title -

physics of plasmas

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.75

H-Index - 160

eISSN - 1089-7674

pISSN - 1070-664X

DOI - 10.1063/1.3573864

Subject(s) - helicon , physics , magnetic field , cyclotron , electromagnetic electron wave , electron , atomic physics , electromagnetic radiation , plasma , magnetic damping , wave propagation , landau damping , computational physics , condensed matter physics , optics , nuclear physics , quantum mechanics , vibration

Particle-in-cell simulations are performed to investigate wave propagation and absorption behavior of low-field (B0<5 mT) helicon waves in the presence of a diverging magnetic field. The 1D electromagnetic simulations, which include experimental external magnetic field profiles, provide strong evidence for electron–cyclotron damping of helicon waves in the spatially decaying nonuniform magnetic field. For a dipole-type magnetic field configuration, the helicon waves are absence in the downstream (lower field) region of the plasma and are observed to be completely absorbed. As the magnetic field is changed slightly however, wave damping decreases, and waves are able to propagate freely downstream, confirming previous experimental measurements of this phenomenon.

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