Space-time structure of ion beam-plasma turbulence

Journal Article · Mon Dec 01 04:00:00 EST 1975 · Phys. Fluids, v. 18, no. 12, pp. 1756-1761

DOI:https://doi.org/10.1063/1.861094· OSTI ID:4093574

Doveil, F; Gresillon, D

The turbulence excited by an ion beam penetrating an unmagnetized plasma is investigated. One-dimensional linear kinetic theory predicts the ion acoustic mode to be driven unstable when the beam velocity v/subb/ ranges from c/subs/ to 2c/subs/. Numerical calculations are reported for the three dimensional problem, in which attention is given to unstable waves. The direction of propagation, the phase velocities, and the growth rate contours in the (k/sub parallel/, k/sub perpendicular/) plane, are given as a function of v/subb/. This instability is created in a double plasma device, and investigated by means of space and time correlations. Turbulence is excited, consisting of modes propagating at a phase velocity which agrees with theory. As v/subb/ increases, an abrupt transition from one-dimensional to three-dimensional structure occurs as expected. (AIP)

• Research Organization: Groupe de Recherche du Centre National de la Recherche Scientifique, Laboratoire de Physique des Milieux Ionises, Ecole Polytechnique, 91120 Palaiseau, France
• Sponsoring Organization: USDOE
• NSA Number: NSA-33-014441
• OSTI ID: 4093574
• Journal Information: Phys. Fluids, v. 18, no. 12, pp. 1756-1761, Journal Name: Phys. Fluids, v. 18, no. 12, pp. 1756-1761; ISSN PFLDA
• Country of Publication: United States
• Language: English

Related Subjects

*BEAM-PLASMA SYSTEMS-- TURBULENCE
700103* --Fusion Energy--Plasma Research--Plasma Kinetics-- General
DISPERSION RELATIONS
ION ACOUSTIC WAVES
KINETIC EQUATIONS
N70300* --Physics--Controlled Thermonuclear Research-- Kinetics (General)
PLASMA
PLASMA INSTABILITY