Accession Number : ADA181651

Title :   Relativistic Self Focusing of Short Pulse Radiation Beams in Plasmas.

Descriptive Note : Interim rept.,

Corporate Author : BERKELEY SCHOLARS INC SPRINGFIELD VA

Personal Author(s) : Sprangle, P ; Tang, Cha-Mei ; Esarey, E

PDF Url : ADA181651

Report Date : 15 May 1987

Pagination or Media Count : 39

Abstract : An envelope equation is derived which describes the radial evolution of a radiation beam propagating through a plasma. The radiation envelope equation contains a defocusing term due to diffraction spreading and a focusing term due to relativistic oscillations of the plasma electrons. The case of a constant density background plasma is analyzed in detail and an expression for a critical laser power is derived. For powers exceeding the critical power the radiation envelope oscillators and does not diffract. Under certain conditions, the radiation beam propagates through the plasma with a constant radius envelope. Keywords: Self focusing; Laser plasma interactions; Radiation propagation; Envelope equation; Relativistic plasma.

Descriptors :   *PLASMAS(PHYSICS), *INTERACTIONS, *BEAMS(ELECTROMAGNETIC), *LASER BEAMS, *LASER INDUCED FUSION, DENSITY, LASERS, ELECTRONS, RADIATION, ENVELOPE(SPACE), OSCILLATORS, RADIUS(MEASURE), EQUATIONS, POWER, PROPAGATION, SHORT PULSES, PULSARS, POWER LEVELS, OSCILLATION, FOCUSING, SELF OPERATION

Subject Categories : Electricity and Magnetism
      Plasma Physics and Magnetohydrodynamics
      Fusion Devices(thermonuclear)

Distribution Statement : APPROVED FOR PUBLIC RELEASE