The thesis aims at the investigation of the effect of a spatially non-homogeneous magnetic field on the dispersion properties of Langmuir waves (electrostatic waves near the electron plasma frequency) in a weakly ionized plasma. Langmuir waves are typically strongly damped in laboratory plasmas due to Coulomb collisions, while they are often observed in the solar wind and may play a role in the energy dissipation of electrons. In particular, Langmuir waves have been observed inside isolated magnetic holes, suggesting that magnetic holes play an important role in their generation. During the thesis activity Langmuir waves will be destabilized in a dedicated experiment by using a suprathermal electron beam propagating in a background plasma. The role of an externally applied magnetic nozzle will be investigated in a variety of experimental conditions also in terms of background gas (He, Ar and H), pressure, an ionization fraction.

Analisi sperimentale dell'eccitazione delle onde di Langmuir in un plasma debolmente ionizzato

MOGNO, PIETRO
2023/2024

Abstract

The thesis aims at the investigation of the effect of a spatially non-homogeneous magnetic field on the dispersion properties of Langmuir waves (electrostatic waves near the electron plasma frequency) in a weakly ionized plasma. Langmuir waves are typically strongly damped in laboratory plasmas due to Coulomb collisions, while they are often observed in the solar wind and may play a role in the energy dissipation of electrons. In particular, Langmuir waves have been observed inside isolated magnetic holes, suggesting that magnetic holes play an important role in their generation. During the thesis activity Langmuir waves will be destabilized in a dedicated experiment by using a suprathermal electron beam propagating in a background plasma. The role of an externally applied magnetic nozzle will be investigated in a variety of experimental conditions also in terms of background gas (He, Ar and H), pressure, an ionization fraction.
2023
Experimental analysis of Langmuir waves excitation in a weakly-ionized plasma
Experimental Physics
Magnetohydrodynamics
PlasmaDiagnostics
PlasmaInstabilities
PlasmaPhysics
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.12608/80486