Influence of Magnetic Shear on the Lower-Hybrid-Drift Instability in Finite beta Plasmas.
Abstract
A self-consistent theory of the lower-hybrid-drift instability in finite beta plasmas containing magnetic shear is presented. The important finite beta effects included are (1) the coupling of electrostatic and electromagnetic oscillations and (2) the orbit modification of the electrons due to delta B. It is found that the effect of electromagnetic coupling is a destabilizing influence on the instability in a sheared field. On the other hand, the effect of electron orbit modification (i.e.,electron delta B drift-wave resonance) is a stabilizing influence. The key parameter which dictates which effect is more important is Te/Ti. In the limit Te < Ti, the electromagnetic effect dominates, while for Te greater than or equal Ti, the delta B electron drift-wave resonance is more important. The relevance of these results to reversed field is discussed. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 18, 1982
- Accession Number
- ADA114814
Entities
People
- G. Ganguli
- Joseph D. Huba
Organizations
- United States Naval Research Laboratory