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Title: Study of fast electron jet produced from interaction of intense laser beam with solid target at oblique incidence

Abstract

Fast electrons generated along target normal direction from the interaction of intense ultrashort Ti:sapphire laser pulses ({lambda}{sub 0} = 800 nm) with planar copper target at 45 Degree-Sign incidence angle have been experimentally studied under different interaction conditions. Angular spread and energy spectrum of the fast electrons was measured for both p- and s-polarized laser irradiation at intensities in the range 4 Multiplication-Sign 10{sup 16}- 4 Multiplication-Sign 10{sup 17} W/cm{sup 2} (for a fixed pulse duration of 45 fs) and for pulse duration in the range 45 fs-1.2 ps (for a fixed laser fluence of 1.8 Multiplication-Sign 10{sup 4} J/cm{sup 2}). The fast electrons were observed consistently along the target normal direction over the entire range of interaction conditions in the form of a collimated jet, within a half cone angle of 20 Degree-Sign . The fast electrons have continuous energy spectrum with effective temperature 290 keV and 160 keV, respectively, for p- and s-polarized 45 fs laser pulse irradiation at intensity 4 Multiplication-Sign 10{sup 17} W/cm{sup 2}. Scaling laws for temperature of fast electrons with laser intensity and pulse duration were obtained. The experimental results have been explained on the basis of laser absorption and fast electron generation throughmore » the resonance absorption mechanism.« less

Authors:
; ; ;  [1]
  1. Laser Plasma Division, Raja Ramanna Centre for Advanced Technology, Indore 452 013, Madhya Pradesh (India)
Publication Date:
OSTI Identifier:
22068919
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 19; Journal Issue: 11; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; COPPER; ELECTRON TEMPERATURE; ELECTRONS; ENERGY SPECTRA; INCIDENCE ANGLE; INTERACTIONS; LASER RADIATION; LASERS; PHOTON BEAMS; PULSED IRRADIATION; RESONANCE ABSORPTION; SAPPHIRE; SCALING LAWS

Citation Formats

Sanyasi Rao, Bobbili, Arora, Vipul, Anant Naik, Prasad, and Dass Gupta, Parshotam. Study of fast electron jet produced from interaction of intense laser beam with solid target at oblique incidence. United States: N. p., 2012. Web. doi:10.1063/1.4769175.
Sanyasi Rao, Bobbili, Arora, Vipul, Anant Naik, Prasad, & Dass Gupta, Parshotam. Study of fast electron jet produced from interaction of intense laser beam with solid target at oblique incidence. United States. doi:10.1063/1.4769175.
Sanyasi Rao, Bobbili, Arora, Vipul, Anant Naik, Prasad, and Dass Gupta, Parshotam. Thu . "Study of fast electron jet produced from interaction of intense laser beam with solid target at oblique incidence". United States. doi:10.1063/1.4769175.
@article{osti_22068919,
title = {Study of fast electron jet produced from interaction of intense laser beam with solid target at oblique incidence},
author = {Sanyasi Rao, Bobbili and Arora, Vipul and Anant Naik, Prasad and Dass Gupta, Parshotam},
abstractNote = {Fast electrons generated along target normal direction from the interaction of intense ultrashort Ti:sapphire laser pulses ({lambda}{sub 0} = 800 nm) with planar copper target at 45 Degree-Sign incidence angle have been experimentally studied under different interaction conditions. Angular spread and energy spectrum of the fast electrons was measured for both p- and s-polarized laser irradiation at intensities in the range 4 Multiplication-Sign 10{sup 16}- 4 Multiplication-Sign 10{sup 17} W/cm{sup 2} (for a fixed pulse duration of 45 fs) and for pulse duration in the range 45 fs-1.2 ps (for a fixed laser fluence of 1.8 Multiplication-Sign 10{sup 4} J/cm{sup 2}). The fast electrons were observed consistently along the target normal direction over the entire range of interaction conditions in the form of a collimated jet, within a half cone angle of 20 Degree-Sign . The fast electrons have continuous energy spectrum with effective temperature 290 keV and 160 keV, respectively, for p- and s-polarized 45 fs laser pulse irradiation at intensity 4 Multiplication-Sign 10{sup 17} W/cm{sup 2}. Scaling laws for temperature of fast electrons with laser intensity and pulse duration were obtained. The experimental results have been explained on the basis of laser absorption and fast electron generation through the resonance absorption mechanism.},
doi = {10.1063/1.4769175},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 11,
volume = 19,
place = {United States},
year = {2012},
month = {11}
}