Effects of finite plasma beta on the lower-hybrid-drift instability
The local dispersion relation for the lower-hybrid-drift isntability is derived in a fully self-consistent manner including the finite-beta effects associated with (a) transverse electromagnetic perturbations (deltaBnot-equal0), and (b) resonant and nonresonant hB/sub 0/ electron orbit modifications. Moreover, the analysis is carried out for arbitrary values of local ..beta..=8..pi..n (T/sub e/+T/sub i/)/B/sub 0//sup 2/, T/sub e//T/sub i/, ..omega../sup 2//sub p e//..omega../sup 2//sub c e/, and V/sub E//v/sub i/. (Here, V/sub E/ is the cross-field E x B velocity, and v/sub i/ is the ion thermal speed.) For all parameter regimes studied, the net effect of finite plasma beta is to reduce the maximum growth rate ..gamma../sub m/ of the lower-hybrid-drift instability. The details, however, vary, depending on plasma parameters. For example, if T/sub e/very-much-less-thanT/sub i/ and V/sub E/..0. On the other hand, for T/sub e/approx. =T/sub i/, there exists a critical value of plasma beta (..beta../sub cr/) such that the lower-hybrid-drift instability is completely stabilized (..gamma..<0) for ..beta..>..beta../sub cr/. (AIP)
- Research Organization:
- University of Maryland, College Park, Maryland, 20742
- OSTI ID:
- 7311943
- Journal Information:
- Phys. Fluids; (United States), Vol. 20:2
- Country of Publication:
- United States
- Language:
- English
Similar Records
Influence of magnetic shear on the lower-hybrid-drift instability in toroidal reversed-field pinches
Influence of strong inhomogeneities on high-frequency mirror-drift-cone and convective-loss-cone instabilities