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Stable excitation discharge in a TEA gas laser is obtained with an equivalent repetition rate of 17 kHz in a double pulse mode employing a supersonic flow. Based on the experimental results, a formula for estimating the maximum repetition rate in a supersonic flow is proposed.
High-pressure, pulsed glow discharge has been studied for the excitation discharge in TEA gas lasers. The influences of the gas density depletion on the high-pressure, pulsed glow discharge have been investigated eliminating the other instabilities, such as shock waves, residual ions, discharge products and electrode heating. The gas density depletion is produced by utilizing a subsonic gas flow between...
Induction Linear accelerator “ETIGO-III” (8 MV, 5 kA, 30 ns) is a intense, pulsed, relativistic-electron-beam (IREB) generator designed for applications in material science, high-power microwave generation, pulsed X-ray emission and environmental studies. It consists of four acceleration units, each of them applies a pulsed voltage of 2 MV on the IREB. The IREB is guided by a magnetic field through...
The environmental problem in the earth such as acid rain is one of the important problem to be solved. Large amount of NOX is produced by electric power plants, ironworks and diesel engines, which is the serious problem of the environment. The removal of NOX has been studied by using intense pulsed relativistic electron beam (IREB). With the initial NO concentration of 100 ppm and pressure of 120...
The double pulse discharge has been demonstrated in a gas flow with velocity of 200 m/s which is generated by Ludwieg tube. A gas mixture of helium and argon is used to simulate the excitation discharge of excimer lasers. The shock waves and the gas density perturbation between the two successive discharges have also been visualized by using the shadowgraph technique with the high-speed image-converter...
The floating particles produced by the high-pressure, pulsed glow discharge on KrF excimer laser excitation have been visualized by the pulsed-laser scatter method. The double-pulse discharge experiments have also been carried out to study the effects of the floating particles on the discharge instabilities. The particles with diameter of the order of 100 µm are observed in the discharge region just...
The high-pressure, pulsed glow discharge has been studied for further understanding of the excitation discharge on excimer lasers. The influences of shock waves on the discharge have been investigated eliminating the other factors, which may affect the discharge instabilities, such as gas density depletion, discharge products, residual ions and electrode heating. A shock wave of 1.2 in Mach number...
Recent progress is overviewed on pulse-power technology and its applications. Tight focusing of ion beam was obtained by self-magnetically insulated, “Spherical Plasma Focus Diode” (SPFD). Efficient Br-ion diode was been developed with good turn-on characteristics, where insulating magnetic flux density increases with radius. Quick charging, Blumlein pulse-forming line was successfully developed using...
Very tightly-focused ion beam was obtained by “Plasma Focus Diode” (PFD), yielding focusing diameter of ∼ 360 µm, and power density of ∼ 0.1 TW/cm2 at the beam energy of ∼ 1.5 MeV. Enhanced energy deposition was observed in the interaction with aluminium target with the enhancement ratio of ∼ 1.5. In comparison of the experimental data with 1-D hydrocode simulation, good agreement is obtained between...
A new type of director for circularly polarised waves is proposed and its characteristics investigated experimentally. The experiment is performed by using an Archimedean spiral antenna as a broadband exciter. It is revealed that the director composed of a helicoid operates over a frequency range of 1 to 2, which is broader than a conventional helix. It is also found that the gain relative to the...
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