A. A. Andreev

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We experimentally demonstrate a notably enhanced acceleration of protons to high energy by relatively modest ultrashort laser pulses and structured dynamical plasma targets. Realized by special deposition of snow targets on sapphire substrates and using carefully planned prepulses, high proton yields emitted in a narrow solid angle with energy above 21 MeV(More)
We have analyzed the coupling of ultraintense lasers (at ∼2×10{19}  W/cm{2}) with solid foils of limited transverse extent (∼10  s of μm) by monitoring the electrons and ions emitted from the target. We observe that reducing the target surface area allows electrons at the target surface to be reflected from the target edges during or shortly after the laser(More)
The parameters of metallic plasma in the interelectrode gap of vacuum-arc discharge have been studied over a wide range of gas pressures. Emission spectroscopy methods and electric probe techniques were used for diagnostics. In the 1-10 Pa pressure range, the action of the mechanism of activation (excitation and ionization) of metal (Ti) ions and atoms was(More)
Femtosecond laser-produced plasmas are bright ultrafast line x-ray sources potentially suitable for different applications including material science and biology. The conversion efficiency of the laser energy incident onto a solid target into the x-ray emission is significantly enhanced when a laser prepulse precedes the main pulse. The details of x-ray(More)
A focused short-pulse laser of TEM (1,0)+TEM (0,1) mode has two intensity peaks in the radial direction, so that the transverse ponderomotive force may trap electrons between the two peaks. At the same time the longitudinal ponderomotive force may accelerate electrons at the head of the laser pulse, when the laser is focused. When the electrons move to the(More)
An unprecedented increase of kinetic energy of laser accelerated heavy ions is demonstrated. Ultrathin gold foils have been irradiated by an ultrashort laser pulse at a peak intensity of 8×10^{19}  W/  cm^{2}. Highly charged gold ions with kinetic energies up to >200  MeV and a bandwidth limited energy distribution have been reached by using 1.3 J laser(More)
The laser driven ion acceleration and hard X-ray emission caused by ultrahigh intensity laser pulse interaction with mass limited targets has been studied with theory and PIC simulations. It is found that maximal energy of ions, its directionality and efficiency of X-ray production can be significantly enhanced by choosing of tailored targets.
Energetic proton acceleration from concave targets, the front of which were irradiated with 40 fs laser pulses with an intensity of 10(20)W/cm(2), has been studied as a function of the depth of the concave shape. Three kinds of targets, a triangular concave target, a circular concave target and a parabolic concave target are considered. When the depth of(More)
The experiments and simulations of fast particles production by an ultra-short laser pulse at intensity les 1.1times10<sup>19</sup> W/cm<sup>2</sup> interacting with a foil target of different materials and thickness were performed. The angular distributions of the ejected fast particles were detected in experiments and calculated