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Various sources are being used for generation of high-current electron beams (current amplitude of 103–107A, electron energy of 104–107eV and pulse duration of 10−9–10−5s) in specially designed diodes. The main requirements for these sources are as follows: (a) electron emission occurs simultaneously with the accelerating pulse; (b) the extracted electron current density should be governed by the...
Propagating laser pulses over distances larger than vacuum diffraction length is a critical issue for laser wakefield acceleration (LWFA). A new method of optical guiding using fast Z-pinch have been proposed for the GeV LWFA experiment. The feasibility of the guiding of high intensity laser pulses using this method has been experimentally demonstrated over a distance of 2 cm corresponding to 12.5...
Physical mechanisms leading to microwave breakdown on dielectric/gas interfaces are investigated for power density on the order of 10 MW/cm2 at 2.85 GHz and gas pressures on the order of 10−4 torr to 103 torr. The investigation is focused on an alumina/air interface; other gases are considered for reference purposes. A 3 MW magnetron with 3.5 µs pulse width is coupled to an S-band traveling wave resonator...
The transition of high-current glow to an arc and the energy dissipated on the glow phase caused by static breakdown in uniform-field gaps of up to 2 cm has been investigated in dry-air at gas pressures of 1–20 Torr. A low inductance capacitor of 1.89µF and a discharge apparatus with a co-axial configuration were used to produce a transient glow discharge with a current in excess of 400 A. Results...
Emission of high-energy electron beams up to 2 MeV were observed from underdense plasmas produced by focusing high-power short laser pulses (1.8TW, 100fs) on gas jets. The electron beam was collimated in a half angle of 3–4° around the optical axis of the laser beam. The energy of the electrons has the power-law spectrum of E−3.5. The production of the high-energy electrons closely correlated with...
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...
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