Generation and Application of High Intensity Pulsed Ion Beams Using Active Plasma Sources

The report highlights the researches relating to generation and application of high intensity pulsed ion beams formed by the direct ion acceleration in diode systems or the collective ion acceleration using pulsed electron beams..

Modelling of chemical reactions in plasma

The paper is devoted to theoretical investigation of interaction of pulsed high current electron beam with gas substance. As a result of the interaction the formation of chemical active plasma can be observed. One of the key parameter for theoretical analyze of the process is the electron distribution function. Within the framework of the Boltzmann approach we obtained the dynamical equation for electron distribution function depending on the electron energy, coordinate and time

Study of the structure of crater at the surface of 12Cr18Ni10Ti steel irradiated by high-power pulsed ion beam

The topography of surface layers of 12Cr18Ni10Ti (AISI 321) steel after pulsed high-power Cn+ ion beams irradiation was investigated by scanning electron microscopy. A thin foil was prepared from the cross section of a crater with the use of a focused ion beam in the column of a two-beam electron-ion microscope. The microstructure and chemical composition of the crater were studied by transmission electron microscop

Properties of the VT1-0 titanium surface modified by a pulsed ion beam

The physicomechanical properties of the VT1-0 titanium surface modified by a pulsed carbon ion beam at a pulse duration of 80 ns, an energy of 200 keV, a current density of 120 A/cm2, an energy density of 1.92 J/cm2, and various numbers of pulses (four regimes) are studied. Irradiation by the beam leads to hardening of a 1.8-μm-thick surface layer in titanium, a decrease in the hydrogen sorption rate, a decrease in the grain size, and the formation of twins

The Effect of Doping on the Electrophysical Properties of Polycrystalline Diamond Films Deposited from an Abnormal Glow Discharge

The paper is focused on the study of the boron doping effect on the electrical characteristics, on the mechanism of charge carrier transfer, and on the energy spectrum of the localized defect states in the polycrystalline diamond films (PDF) deposited from an abnormal glow discharge. PDF doping enables to form the semiconductor layers of p-type conductivity, which have as good properties as those of PDF produced by the alternative methods. The doping reduces the degree of disorder in the film material brought by the growth defects, which determine the film electrical characteristics and electrotransfer mechanism. The PDF electrical characteristics and electrotransfer mechanism are determined by the defects of different nature, whose band gap energy levels have a continuous energy distribution. A p-type activation component is realized in the exchange of charge carriers between the valence band and shallow acceptor levels with the activation energy of 0.013-0.022 eV. Doping increases the effect of the hopping mechanism of the conductivity involving the localized states with a density of (1-6)•10{20} eV{-1}•cm{-3} distributed near the Fermi level, which is in the low half of the band gap

Effect of high-power ion beams on the surface topography and structure of the subsurface layer of sun microcrystalline titanium alloys

A rather homogeneous grain structure with equiaxial grains is formed for both alloys already after the effect of one pulse of the high-power ion bea

On physical properties of nanoparticles: size effect and scale of nanoobjects

A transition border between macroscopic and nanoscale states of solids associated with change of its physical properties is certain to exist. The change of mechanical, magnetic, thermal and other properties of nanoparticles may be due to the surface tension, decrease in coordination number in the topsurface layer, rebuilding of the electron shell structure, change of the symmetry group of the crystal lattice and the binding energy

Effect of powerful pulsed and continuous ion beams on the Al-Cu-Mg alloy structure

The paper considers the results of an electron microscopy study of the VD1 alloy of the Al-Cu-Mg system after cold working and subsequent irradiation with a powerful pulsed ion beam (70% C[+] + 30% H[+], Е=180 keV) in the pulsed-periodic mode ([tau] = 80 ns, f = 0.1 Hz, j = 200 A/cm{2}, F = 1·10{14} cm{-2}) and under the conditions of the generation of only one pulse ([tau] = 180 ns, j = 100 A/cm{2}, F = 2·10{15} cm{-2}). It is established that this irradiation noticeably affects the microstructure of the cold-worked 3 mm thick sheets of VD1 alloy. The initial cellular dislocation structure transforms into a subgrain one. The intensity of structural transformations in the alloy increases with ion current density of a pulse. A similar transformation of a dislocation structure over the entire thickness of the sample is observed under irradiation with continuous Ar{+} ion beams (Е = 20-40 keV) with not high fluences (10{15}-10{16} cm{-2})

Near-term experiments and long-term goals at INURA pulsed ion accelerator in Nazarbayev University

Nazarbayev University works on establishing a research program on inertial confinement fusion, high energy physics and critical states of matter. Long term plans include building a new multi-MV, ~10 to several hundred GW/cm2 ion accelerator facility which will be used in studies of material properties at extreme conditions. Two design options are being considered..