Journal ArticleDOI
Kinetic theory of a relativistic beam
TLDR
In this paper, a quasi-static Bennett equilibrium, with isothermal distribution of transverse momenta, is shown to be a similarity solution of the Fokker-Planck equation with scale radius increasing in accord with Nordsieck's formula.Abstract:
A Fokker–Planck equation is derived to study the evolution of a stable, low‐current beam propagating in a gas‐plasma medium. Small‐angle scattering of the beam particles by the medium causes diffusion in the phase space projected transverse to the direction of propagation. The projected components of dynamical friction vanish. As a result, there is a continued input of energy into the transverse particle motions, which is taken up in expansion against the pinch field. A quasi‐static Bennett equilibrium, with isothermal distribution of transverse momenta, is shown to be a similarity solution of the Fokker–Planck equation with scale radius increasing in accord with Nordsieck’s formula. An H theorem is proved and the Bennett distribution is shown to minimize both H and −dH/dt; hence, it is the time‐dependent asymptotic state. The predicted current profile and radius are shown to be in fair agreement with experiment.read more
Citations
More filters
Journal ArticleDOI
Resistive hose instability of a beam with the Bennett profile
TL;DR: In this paper, the authors examined the resistive hose instability of a self-pinched relativistic beam with emphasis placed on the important case of the Bennett current profile JB(r) ∝ (1+r2/a2)−2.
Journal ArticleDOI
Field-reversed configurations with a component of energetic particles
John M. Finn,R. N. Sudan +1 more
TL;DR: In this article, the physics of field-reversed configurations created by energetic particles of large orbits, of which the earliest example is the Astron concept has evolved into the Ion Ring Compressor in which a low-energy ring of ions is magnetically compressed to high energy for heating the confined plasma to thermonuclear ignition.
Posted Content
Physics of high-intensity high-energy particle beam propagation in open air and outer-space plasmas
TL;DR: In this article, a review of the physics of propagating pulses of high-intensity high-energy particle beams in pre-existing or self-generated plasmas is presented.
Journal ArticleDOI
Demonstration of electron beam self‐focusing in plasma wake fields
James Rosenzweig,P. Schoessow,B. Cole,C. Ho,W. Gai,R. Konecny,S. Mtingwa,J. Norem,M. Rosing,J. Simpson +9 more
TL;DR: In this article, the dynamics of beam self-pinching and the fast collisionless evolution of a Bennett-like, near-equilibrium profile are examined theoretically and computationally.
Journal ArticleDOI
Measurements of hose instability of a relativistic electron beam
TL;DR: In this paper, the observed disruption of a self-focused, relativistic electron beam propagating through a gas is shown to result from the growth of m=1 (kink) or "hose" perturbations.