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For effective use of reserved energy of a source in various technological applications, researches of pulse discharges in water, represent a great interest [1–3]. Impact of the high electric fields on water medium causes a some physical processes, directed on cleaning of drinking water and wastewater from dangerous bacteria and viruses. Using of asymmetrical electrode system in water and pulsed microsecond...
Observations of rapidly formed (<50–300 ns) distributed plasma discharges using X-band microwaves in neon and Ne(Ar) mixture gases are presented. A stainless steel cylindrical discharge test chamber, which is enclosed with polycarbonate windows on both ends, is used to observe microwave breakdown in noble gases including Penning discharge Ne(Ar) and Ne(Kr) mixes from 10 to 760 torr. The chamber...
Laser-wakefield accelerators, comprising of a high-power laser (> 100 TW) laser pulse incident on a low-density plasma, are a promising compact sources of high-energy electron beams. Recently it was shown that plasma-based accelerators can act as effective wigglers, capable of the production of high brightness and spatially coherent hard x-ray beams. Experiments have previously demonstrated the...
It has been demonstrated that laser-wakefield acceleration (LWFA) can generate several electron beam parameters rivaling those generated by conventional RF-cavity accelerators. Tunable and monoenergetic electron beams have also been produced with LWFA. Currently, active research is being directed towards finding methods to generate e-beams that have independently controllable parameters, as is standard...
The main objective of the researches is the structure and features of the formation of thin films of silicon dioxide from ablation plasma formed by a high power ion beam (HPIB) when exposed to micro- and nanosized silica powder is compacted. In researches is used SiO2 particles obtained in a plasmochemical reactor from the gas phase by exposure to an electron beam of nanosecond duration1, along with...
This work was conducted within the framework of PAUD (Plasma Airborne molecular contamination Ultra Desorption), a collaborative program funded by OSEO and certified by French global competitive clusters Minalogic and Trimatec. The main object of interest is to develop new technology bricks for next generation molecular decontamination systems. As part of our research effort in evaluating the potential...
Thresholds for low density regions (microbubbles) and microplasma light emissions generation in liquid are studied. With nanosecond microdischarges at different applied peak voltages with the different sizes of microelectrode tip, the low density regions (microbubbles) are captured by a high speed ICCD camera and the microplasmas light emissions are detected by both the ICCD camera and a Photomultiplier...
Capacitively coupled microplasmas in dielectric cavities have a range of applications from VUV lighting sources for surface treatment to radical production. Due to the large surface-to-volume ratio of these devices, the wall mediated dynamics of plasma transport are important to the uniformity and confinement of the plasma. For example, there may be applications where a plume of ionized gas is desired...
Cold atmospheric plasmas (CAP) may have the ability to improve cancer treatment, though the mechanisms of which are yet to be fully understood. Recent works have shown that Rayleigh microwave scattering (RMS) can be used to obtain the absolute value of the electron density in CAP. An RMS apparatus titled the Microwave Electron Density Device (MEDD) has recently been fabricated and tested at The George...
The ion beam for vacuum arc ion source in sealed tube neutron generator owns some special features, such as multi-particle mixtures, high-intensity beams, short pulse-width, short transport-distance and asymmetric beams. It is related to the design of the vacuum arc ion source and beam optics, which affect the insulation withstand of the device, the life of tritium target, the neutron yield, and so...
Pulsed power researches for military and civil applications have been conducted at China Academy of Engineering Physics (CAEP) for more than fifty years. The pulsed power research activities include development of pulsed power components such as different kinds of high voltage switches, series of pulsed power sources and pulsed X-ray machines, high current accelerators for Z-pinch and flash X-ray...
The Dual-Axis Radiographic Hydrotest (DARHT) facility uses bremsstrahlung radiation source spots produced by the focused electron beam produced by two linear induction accelerators (LIAs) to radiograph large hydrodynamic experiments driven by high explosives. Radiographic resolution is determined by the size of the source spot, and beam emittance is the ultimate limitation to spot size. On the DARHT...
Space and time resolved discharge images from an atmospheric pressure non-thermal bioplasma jet have been observed by a high-speed single-frame camera to investigate the electron temperatures. The Ar plasma propagation speed with the group velocity in the plasma column of indirect plasma jet has been shown to beabout 120 km/s which corresponding with ion acoustic velocity of 0.8 km/s of plasma exposure...
Flat lamps comprising large arrays of microcavity plasmas, and capable of efficiently generating VUV or UV-C radiation, have been developed and will be described. UV light is desirable for a number of chemical processes and disinfection methods available commercially but conventional UV light sources suffer from several drawbacks, including undesirable form factors and environmental concerns regarding...
A micro hollow cathode discharge VUV source, with time averaged power above 3 watts, and peak power above 40 watts is presented1. Such operation is achieved by driving the microdischarge (MD) in the arc mode where high electron densities and low discharge impedances exist. Improved theoretical estimations regarding the timescales of arc formation are presented. With typical electrical sources, the...
As fusion reactors scale up in size, power, and duty cycle, the quantity of material eroded from the plasma-facing components (PFCs) will rise to levels far above those seen in prior experiments, and could hinder proper operation. While reactor scenarios have been developed that feature significant local re-deposition of particles eroded from high-flux divertor targets, these regimes require near-surface...
This paper reports the effects of an interaction between tin droplets and a subsequent trigger laser on the Extreme Ultra Violet (EUV) emission after Laser-Triggered Discharge (LTD). Two Nd: YAG lasers were focused on the high-voltage tin cathode surface to trigger the discharges with various delay time. The experiments are based on the observations of the visible light emissions and emitted EUV spectrum...
The magnetic field of a set of saddle coils compared to the magnetic field of the helical winding coil on IR-T1 tokamak in a simulation method. The equation of helical windings that they mounted on vacuum chamber in a spiral modes (L=2, n=1) and (L=3, n=1), where L represents the number of toroidal rounds, and n represents the direction of the poloidal round, using Green function has been calculated,...
We present investigations of gas puff Z-pinch implosions with an applied external Bz field. The experiments are conducted on the 1-MA, 200-ns COBRA generator. Stabilized 200-ns, high current z-pinch implosions have been demonstrated by using double or triple-gas puffs. In the experiments, a triple-nozzle is used to produce z-pinch loads with concentric outer, inner and center gas puff columns. Implosion...
Thin coatings composed of low-Z elements (lithium, boron, beryllium, carbon) are applied to graphite or metal substrates in tokamaks. Because these coatings improve plasma performance, it is important to characterize how fast the film thickness changes. The erosion rate of these low-Z elements is strongly dependent on ion flux Γi and surface temperature Tsurf. Re-deposition rates vary with electron...
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