Ion acoustic instability driven by a temperature gradient in laser-produced plasmas

Citation
Av. Brantov et al., Ion acoustic instability driven by a temperature gradient in laser-produced plasmas, PHYS PLASMA, 8(8), 2001, pp. 3558-3564
Citations number
33
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICS OF PLASMAS
ISSN journal
1070-664X → ACNP
Volume
8
Issue
8
Year of publication
2001
Pages
3558 - 3564
Database
ISI
SICI code
1070-664X(200108)8:8<3558:IAIDBA>2.0.ZU;2-K
Abstract
The return current instability excited in laser-produced plasmas by a tempe rature gradient has been studied using a nonlocal theory of electron transp ort. The transport model is applicable for an arbitrary ratio of the temper ature inhomogeneity scale length to the collisional mean free path. It is d emonstrated that nonlocal thermal effects have a significant impact on the ion acoustic instability growth rate, threshold and angular distribution of excited waves that can be important for the interaction of smoothed laser beams with a plasma. A nonlinear dependence of the return current instabili ty growth rate on the gradient length has been discovered. The particularly important example of ion acoustic instability due to inhomogeneous plasma heating as a result of inverse bremsstrahlung absorption in a hot spot has been considered. (C) 2001 American Institute of Physics.