Hard X radiation and fast particles in laser plasma experiments at laser intensities of up to 5×1018 W/cm2 on the target surface
ABSTRACT Results are presented from an investigation of the hard X-ray spectrum and the parameters of fast particles in experiments
on the interaction of laser pulses with solid targets in the PROGRESS-P facility at laser intensities of up to 5×1018 W/cm2 on the target surface. The maximum energy of fast electrons obtained from direct measurements is found to be 8–10 MeV.
SourceAvailable from: Kazuo A Tanaka[Show abstract] [Hide abstract]
ABSTRACT: Oblique incidence of a $p$-polarized laser beam on a fully ionized plasma with a low density plasma corona is investigated numerically by Particle-In-Cell and Vlasov simulations in two dimensions. A single narrow self-focused current jet of energetic electrons is observed to be projected into the corona nearly normal to the target. Magnetic fields enhance the penetration depth of the electrons into the corona. A scaling law for the angle of the ejected electrons with incident laser intensity is given. Comment: 5 pages, 3 figures, minor modifications and extensionsPhysical Review Letters 07/1998; DOI:10.1103/PhysRevLett.82.743 · 7.73 Impact Factor
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ABSTRACT: The interaction of a 1053 nm picosecond laser pulse with a solid target has been studied for focused intensities of up to 10 19 W cm 2 . The maximum ion energy cutoff E max which is related to the hot electron temperature is in the range 1.0–12.0 MeV and is shown to scale as E max I 1/3 . The hot electron temperatures were in the range 70–400 keV for intensities up to 510 18 W cm 2 with an indication of a high absorption of laser energy. Measurements of x-ray/-ray bremsstrahlung emission suggest the existence of at least two electron temperatures. Collimation of the plasma flow has been observed by optical probing techniques. © 1997 American Institute of Physics.Physics of Plasmas 02/1997; DOI:10.1063/1.872103 · 2.25 Impact Factor