Section 2 PROGRESS IN LASER FUSION 2.A Parametric Instabilities Driven by Two Pumps in Laser-Fusion Plasmas
ثبت نشده
چکیده
Parametric instabilities of importance to laser-plasma interactions in laserfusion experiments are usually analyzed assuming only one laser beam (pump) drives each instability. In actual experiments, however, multiple laser beams may overlap in a localized region of the fusion target corona, where parametric instabillties may be driven by more than one pump. In the simplest case, shown in Fig. 26.1, three-wave instabilities driven by one pump become five-wave instabilities driven by two pumps; the angle between the pumps is 28, the angle between the fixed positions of two illuminating beams. Five-wave parametric instabilities are the main subject of this article.
منابع مشابه
Inverse Braking Radiation and Resonance Absorption in Corona Plasmas of Inertial Confinement Fusion
Abstract: In this paper, combining the Maxwell equations with the electron balanceequation, we obtain the inverse braking radiation absorption coefficient in a laser fusioncorona plasma. For a fixed plasma temperature, variations of the absorption coefficientversus the penetration depth into the plasma are illustrated numerically for differentvalues of laser wavelength. ...
متن کاملEnergy Gain of Magnetized Cylindrical D-T Targets in Fast Ignition Fusion
In recent years, many different plans have been considered to use the nuclear energy gained from inertial confinement fusion (ICF) as attempts to obtain high energy efficiencies. In conventional ICF methods, a small amount (about mg) of the deuterium–tritium compound is confined in a small spherical chamber of a few millimeters in radius and compressed by laser or heavy ion beams with powers in...
متن کاملEnergy Gain of Magnetized Cylindrical D-T Targets in Fast Ignition Fusion
In recent years, many different plans have been considered to use the nuclear energy gained from inertial confinement fusion (ICF) as attempts to obtain high energy efficiencies. In conventional ICF methods, a small amount (about mg) of the deuterium–tritium compound is confined in a small spherical chamber of a few millimeters in radius and compressed by laser or heavy ion beams with powers in...
متن کاملPROGRESS IN LASER FUSION 2. D Three-Halves Harmonic Spectra and Self- Focusing in Laser Plasmas
We have recently reported on the spectral characteristics and the generation mechanisms for the harmonic radiation emitted from laserproduced plasmas.' We noted on that occasion that the observed asymmetric splitting of the 3~ , / 2 spectra from UV-laser plasmas (Fig. 16) could not be explained on the basis of a planar plasmaexpansion model. In the preceding article of this review, the theoreti...
متن کاملFokker - Planck Simulations of Laser Filamentation in Plasmas
In inertial confinement fusion (ICF), where irradiation uniformity is a crucial issue, it is important to understand the process of laser-filamentation instability.' The breakup of laser light into filaments occurs as a result of plasma density depressions that form localized focusing channels. The density depressions may be caused either by ponderomotive forces2 due to laserplasma interactions...
متن کامل