Results 1 - 10 of 6772
Results 1 - 10 of 6772. Search took: 0.03 seconds
|Sort by: date | relevance|
[en] As is shown, the influence of induction effects on the development of beam-plasma instability is the coupling coefficient between the beam and plasma is small. In such a case, there arise a seft-congruent, longitudinally homogeneous electric field, which accelerates the beam electrons. The induction effects lead to the prolongation of linear stage of instability development and some increase in the maximum amplitude of the field of plasma oscillations. 7 refs
[en] The problem of excitation of nonlinear one-dimensional wake fields by a single bunch and by series of bunches is considered numerically. Electron density distribution in the bunch was chosen uniform, parabolic, and linearly growing from the beginning of the bunch to its end. The results obtained show a dependence of excited potential electric fields on parameters of bunches and allow to choose optimal parameters. 12 refs
[en] A simple plasma model is used to analyze the flute instability of a pure ion channel in a magnetized plasma. In this model, ions are cold and immobile due to heavy mass, while electrons in the plasma have a low temperature so that they can move in the magnetic field. Because of the axially applied magnetic field and the radial electric field in an interface of the ion channel and plasma, an vectorE x vectorB drift occurs in azimuthal direction and this drift causes the flute instability of the ion channel in the interface. In this paper, an approximate growth rate of the instability is obtained and a specific example associated with a plasma lens is given. (orig.)
[en] The possibility of effective (up to 75 percent) transmission of a high-current electron beam through a pre-ionized gas (p = 10-4 + 10-5 torr) is studied. Optimal beam transmission was observed with f = n/sub i//n/sub eb/ approximately 10 and total compensation of the beam current with c/ω/sub p/ approximately 0.1 r/sub b/
[en] This paper describes an investigation of the properties of the relativistic critical surface in a high intensity laser-plasma interaction, specifically the spatial morphology of the surface and its effect upon the divergence of the reflected light. The particle-in-cell code LSP running in two dimensions (2d3v) was used to model the formation of the critical surface and to show that it resides at a varying depth into the material that is dependent on both the intensity radial dependence of the laser focus as well as the shape of the longitudinal vacuum-material interface. The result is a shaped 'mirror' surface that creates a reflected beam with phase and amplitude information informed by the extent of the preplasma present before the intense laser pulse arrived. A robust, highly effective means of experimentally determining the preplasma conditions for any high intensity laser-matter interaction is proposed using this effect. The important physics is elucidated with a simplified model that, within reasonable intensity bounds, recasts the effect of the complex laser-plasma interaction on the reflected beam into a standard Gaussian optics calculation.