Marginal stability, characteristic frequencies, and growth rates of gradient drift modes in partially magnetized plasmas with finite electron temperature

The detailed analysis of stability of azimuthal oscillations in partially magnetized plasmas with crossed electric and magnetic fields is presented. The instabilities are driven by the transverse electron current which, in general, is due to a combination of E×B and electron diamagnetic drifts. Marginal stability boundary is determined for a wide range of the equilibrium plasma parameters. It is shown that in some regimes near the instability threshold, only the low-frequency long-wavelength oscillations are unstable, while the short-wavelength high-frequency modes are stabilized by the finite Larmor radius effects. Without such stabilization, the high-frequency modes have much larger growth rates and dominate. A new regime of the instability driven exclusively by the magnetic field gradient is identified. Such instability takes place in the region of the weak electric field and for relatively large gradients of plasma density (ρs/ln>1, where ρs is the ion-sound Larmor radius and ln is the scale length of plasma density inhomogeneity). © 2018 Author(s).

Авторы
Lakhin V.P. 1, 2 , Ilgisonis V.I. 2, 3 , Smolyakov A.I. 1, 2, 4 , Sorokina E.A. 1, 2 , Marusov N.A. 1, 2, 5
Редакторы
-
Журнал
Издательство
-
Номер выпуска
1
Язык
Английский
Страницы
-
Статус
Опубликовано
Подразделение
-
Номер
012107
Том
25
Год
2018
Организации
  • 1 NRC Kurchatov Institute, 1 Kurchatov Sq., Moscow, 123182, Russian Federation
  • 2 Peoples' Friendship University of Russia, RUDN University, 3 Ordzhonikidze St., Moscow, 117198, Russian Federation
  • 3 State Atomic Energy Corporation, ROSATOM, 24 Bolshaya Ordynka St., Moscow, 119017, Russian Federation
  • 4 University of Saskatchewan, 116 Science Place, Saskatoon, SK S7N 5E2, Canada
  • 5 Moscow Institute of Physics and Technology, 9 Institutskiy per., Dolgoprudny, 141701, Russian Federation
Ключевые слова
Electric fields; Magnetic fields; Magnetoplasma; Plasma density; Plasma diagnostics; Plasma stability; Stability; Analysis of stability; Azimuthal oscillations; Characteristic frequencies; Crossed electric and magnetic fields; Electron diamagnetic drifts; Finite Larmor radius effects; High-frequency mode; Magnetic field gradient; Electron temperature
Дата создания
19.10.2018
Дата изменения
19.10.2018
Постоянная ссылка
https://repository.rudn.ru/ru/records/article/record/7306/