It is shown that the self-consistent interaction between wake fields and the driving electron bunch in a collisionless, unmagnetized, overdense (n(p) >> n(b)) plasma is governed by three coupled equations. In the long-beam limit, they reduce to a pair consisting of an appropriate nonlinear Schrodinger equation for the beam wave function PSI, and an equation for the wake-field potential that is driven by the transverse profile of the beam density, which is proportional to \PSI\2. The pair of equations are suitable for studying the beam self-focusing (self-pinching equilibrium) for the case in which the beam-spot size is larger (smaller) than the wavelength of the wake fields. It is demonstrated that our self-consistent theory, which is based on the recently proposed thermal wave model for relativistic charged-particle beam propagation, is capable of reproducing the main results for the beam-filamentation threshold and the self-pinching equilibrium condition that are already known in the conventional theory of the beam self-interaction in collisionless plasmas.
Self-consistent Interaction Between the Plasma Wake Field and the driving relativistic electron-beam / Fedele, Renato; P. K., Shukla. - In: PHYSICAL REVIEW A. - ISSN 1050-2947. - STAMPA. - 45:6(1992), pp. 4045-4049. [10.1103/PhysRevA.45.4045]
Self-consistent Interaction Between the Plasma Wake Field and the driving relativistic electron-beam
FEDELE, RENATO;
1992
Abstract
It is shown that the self-consistent interaction between wake fields and the driving electron bunch in a collisionless, unmagnetized, overdense (n(p) >> n(b)) plasma is governed by three coupled equations. In the long-beam limit, they reduce to a pair consisting of an appropriate nonlinear Schrodinger equation for the beam wave function PSI, and an equation for the wake-field potential that is driven by the transverse profile of the beam density, which is proportional to \PSI\2. The pair of equations are suitable for studying the beam self-focusing (self-pinching equilibrium) for the case in which the beam-spot size is larger (smaller) than the wavelength of the wake fields. It is demonstrated that our self-consistent theory, which is based on the recently proposed thermal wave model for relativistic charged-particle beam propagation, is capable of reproducing the main results for the beam-filamentation threshold and the self-pinching equilibrium condition that are already known in the conventional theory of the beam self-interaction in collisionless plasmas.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.