Accession Number : ADA318139

Title :   Temporal Evolution of Self-Modulated Laser Wakefields Measured by Coherent Thomson Scattering.

Descriptive Note : Memorandum rept.,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC BEAM PHYSICS BRANCH

Personal Author(s) : Ting, A. ; Burris, H. R. ; Krushelnick, K. ; Moore, C. I. ; Esarey, E.

PDF Url : ADA318139

Report Date : 25 OCT 1996

Pagination or Media Count : 16

Abstract : Coherent Thomson scattering of a picosecond probe laser was used to measure the time evolution of plasma wakefields produced by a high intensity laser pulse (4 x 10(exp 18) W/cm2) in an underdense plasma (n sub e approx = 10(exp 19)/cc in the Self Modulated Laser Wakefield Accelerator configuration. Plasma wakefields are observed to last for approximately 50 psec. Ion acoustic waves, generated by the decay of the plasma wakefield, were measured to have a duration of approximately 50 psec. These observations are consistent with the decay of large amplitude plasma waves due to the modulational instability and the enhancement of the scattered signal from plasma channel formation.

Descriptors :   *LASER PUMPING, *PLASMA WAVES, SCATTERING, PULSED LASERS, CONFIGURATIONS.

Subject Categories : Plasma Physics and Magnetohydrodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE