Nonlinear excitation of long-wavelength modes in Hall plasmas
Abstract
Hall plasmas with magnetized electrons and unmagnetized ions exhibit a wide range of small scale fluctuations in the lower-hybrid frequency range as well as low-frequency large scale modes. Modulational instability of lower-hybrid frequency modes is investigated in this work for typical conditions in Hall plasma devices such as magnetrons and Hall thrusters. In these conditions, the dispersion of the waves in the lower-hybrid frequency range propagating perpendicular to the external magnetic field is due to the gradients of the magnetic field and the plasma density. It is shown that such lower-hybrid modes are unstable with respect to the secondary instability of the large scale quasimode perturbations. It is suggested that the large scale slow coherent modes observed in a number of Hall plasma devices may be explained as a result of such secondary instabilities.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Oct 01, 2016
- Source ID
- 10.1063/1.4964724
Entities
People
- A. I. Smolyakov
- E. A. Sorokina
- V. I. Ilgisonis
- V. P. Lakhin
Organizations
- Air Force Office of Scientific Research
- National Research Centre Kurchatov Institute
- Natural Sciences and Engineering Research Council
- Peoples' Friendship University of Russia
- Russian Center for Science Information
- University of Saskatchewan