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Title: Study of laser plasma interactions in the relativistic regime

Abstract

We discuss the first experimental demonstration of electron acceleration by a laser wakefield over instances greater than a Rayleigh range (or the distance a laser normally propagates in vacuum). A self-modulated laser wakefield plasma wave is shown to have a field gradient that exceeds that of an RF linac by four orders of magnitude (E => 200 GV/m) and accelerates electrons with over 1-nC of charge per bunch in a beam with space-charge-limited emittance (1 mm-mrad). Above a laser power threshold, a plasma channel, created by the intense ultrashort laser pulse (I approx. 4 x1018 W/CM2, gamma = 1 micron, r = 400 fs), was found to increase the laser propagation distance, decrease the electron beam divergence, and increase the electron energy. The plasma wave, directly measured with coherent Thomson scattering is shown to damp-due to beam loading-in a duration of 1.5 ps or approx. 100 plasma periods. These results may have important implications for the proposed fast ignitor concept.

Authors:
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (US)
Sponsoring Org.:
USDOE, Washington, DC (US)
OSTI Identifier:
16466
Report Number(s):
UCRL-CR-128566; CONF-9605138-
ON: DE98051563; TRN: US0205288
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: Conference title not supplied, Conference location not supplied, Conference dates not supplied; Other Information: Supercedes report DE98051563; PBD: 13 Aug 1997; PBD: 13 Aug 1997
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ACCELERATION; BEAM DYNAMICS; ELECTRON BEAMS; ELECTRONS; KINETIC ENERGY; LASERS; LINEAR ACCELERATORS; PLASMA; PLASMA WAVES; RELATIVISTIC PLASMA; THOMSON SCATTERING

Citation Formats

Umstadter, D. Study of laser plasma interactions in the relativistic regime. United States: N. p., 1997. Web.
Umstadter, D. Study of laser plasma interactions in the relativistic regime. United States.
Umstadter, D. Wed . "Study of laser plasma interactions in the relativistic regime". United States. https://www.osti.gov/servlets/purl/16466.
@article{osti_16466,
title = {Study of laser plasma interactions in the relativistic regime},
author = {Umstadter, D.},
abstractNote = {We discuss the first experimental demonstration of electron acceleration by a laser wakefield over instances greater than a Rayleigh range (or the distance a laser normally propagates in vacuum). A self-modulated laser wakefield plasma wave is shown to have a field gradient that exceeds that of an RF linac by four orders of magnitude (E => 200 GV/m) and accelerates electrons with over 1-nC of charge per bunch in a beam with space-charge-limited emittance (1 mm-mrad). Above a laser power threshold, a plasma channel, created by the intense ultrashort laser pulse (I approx. 4 x1018 W/CM2, gamma = 1 micron, r = 400 fs), was found to increase the laser propagation distance, decrease the electron beam divergence, and increase the electron energy. The plasma wave, directly measured with coherent Thomson scattering is shown to damp-due to beam loading-in a duration of 1.5 ps or approx. 100 plasma periods. These results may have important implications for the proposed fast ignitor concept.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1997},
month = {8}
}

Conference:
Other availability
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