dorsal/arxiv
View SchemaElectron Landau damping in a laboratory dipole magnetic field plasma
| Authors | Nikolay I. Grishanov, Abimael F. D. Loula, Carlos A. De Azevedo, Joaquim Pereira Neto |
|---|---|
| Categories | |
| ArXiv ID | physics/0410125 |
| URL | https://arxiv.org/abs/physics/0410125 |
Abstract
Transverse and longitudinal dielectric permittivity elements are derived for radio frequency waves in a laboratory dipole magnetic field plasma (LDMFP) accounting for the finite ring current radius. The main feature of LDMFP is the fact that, in contrast to planetary magnetospheric plasmas, the untrapped (circulating) particles can exist/circulate (together with the trapped particles) along the equilibrium magnetic field lines. To estimate the wave power absorbed in LDMFP the perturbed electric field and current density components are decomposed in a Fourier series over the poloidal angle. The wave absorption is expressed by the summation of contributions of all harmonics of the perturbed electric field and both the diagonal and non-diagonal dielectric permittivity elements. In this paper, we analyze numerically the separate contributions of the trapped and untrapped electrons to the imaginary part of the longitudinal permittivity elements in LDMFP with an equilibrium (Maxwellian) distribution functions of plasma particles in velocity space. This information is necessary to estimate the collisionless wave dissipation by electron Landau damping. The computations are carried out in a wide range of the wave frequencies.
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"abstract": "Transverse and longitudinal dielectric permittivity elements are derived for\nradio frequency waves in a laboratory dipole magnetic field plasma (LDMFP)\naccounting for the finite ring current radius. The main feature of LDMFP is the\nfact that, in contrast to planetary magnetospheric plasmas, the untrapped\n(circulating) particles can exist/circulate (together with the trapped\nparticles) along the equilibrium magnetic field lines. To estimate the wave\npower absorbed in LDMFP the perturbed electric field and current density\ncomponents are decomposed in a Fourier series over the poloidal angle. The wave\nabsorption is expressed by the summation of contributions of all harmonics of\nthe perturbed electric field and both the diagonal and non-diagonal dielectric\npermittivity elements. In this paper, we analyze numerically the separate\ncontributions of the trapped and untrapped electrons to the imaginary part of\nthe longitudinal permittivity elements in LDMFP with an equilibrium\n(Maxwellian) distribution functions of plasma particles in velocity space. This\ninformation is necessary to estimate the collisionless wave dissipation by\nelectron Landau damping. The computations are carried out in a wide range of\nthe wave frequencies.",
"arxiv_id": "physics/0410125",
"authors": [
"Nikolay I. Grishanov",
"Abimael F. D. Loula",
"Carlos A. De Azevedo",
"Joaquim Pereira Neto"
],
"categories": [
"physics.plasm-ph"
],
"title": "Electron Landau damping in a laboratory dipole magnetic field plasma",
"url": "https://arxiv.org/abs/physics/0410125"
},
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