Discharge Oscillations in Morozov’s Stationary Plasma Thruster as a Manifestation of Large-Scale Modes of Gradient Drift Instability

Abstract: The phenomenon of large-scale discharge oscillations in Morozov’s stationary plasma thruster (SPT) is physically interpreted by analyzing global modes of gradient drift instability. The problem is solved using an ideal two-fluid hydrodynamic plasma model that includes the effects of stationary electron flow, electron inertia, and spatial inhomogeneities of the magnetic field and plasma density along the accelerating channel. The frequencies and axial structure of unstable eigenmodes are calculated for typical parameters of the SPT-100 thruster. The obtained spectrum is characterized by a finite set of long-wavelength azimuthal modes in the lower hybrid frequency range, which are predominantly localized in the near-anode region of the thruster. It is shown that the eigenmodes can form wave packets the main characteristics of which in the linear stage of instability coincide with the parameters of the experimentally observed large-scale azimuthal spoke-like structures. The influence of the thruster geometry (the length and width of the accelerating channel) on the frequency characteristics of oscillations and formation of beatings is investigated. © 2019, Pleiades Publishing, Ltd.

Авторы
Sorokina E.A. 1, 2 , Marusov N.A. 1, 2, 3 , Lakhin V.P. 1, 2 , Ilgisonis V.I. 2, 4
Журнал
Номер выпуска
1
Язык
Английский
Статус
Опубликовано
Том
45
Год
2019
Организации
  • 1 National Research Center “Kurchatov Institute”, Moscow, Russian Federation
  • 2 Peoples’ Friendship University of Russia (RUDN University), Moscow, Russian Federation
  • 3 Moscow Institute of Physics and Technology, Dolgoprudnyi, Moscow oblast, Russian Federation
  • 4 State Atomic Energy Corporation “Rosatom”, Moscow, Russian Federation
Дата создания
19.07.2019
Дата изменения
19.07.2019
Постоянная ссылка
https://repository.rudn.ru/ru/records/article/record/39010/
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