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Summary form only given. To diagnose plasmas with least perturbation, while still achieving good spatial resolution, one of the most common and simple approaches is to use small physical probes, which still have a long dimension out to the wall for data transmission. An alternative, which is truly miniature in all three dimensions, is to use microparticles (~10-6 m). The concept of injecting microparticles...
Summary form only given. A key aspect of the behavior of non-transferred DC arc plasma torch is the stochastic aspect of arc formation inside the nozzle. This phenomenon results in instabilities in the jet flow that are enhanced by the turbulent mixing with the ambient gas when the plasma jet issues in the quiescent surrounding gas. In addition, the wear of electrodes contributes to make the flow...
Summary form only given. In this paper, we design of a modular, robust, high-current switch for controlling discharge current in the small plasma device. As developed silicon controlled rectifier units are connected in parallel to provide 14 kamp current-carrying capacity. Associated snubber and protection circuits are described in detail. The structural features and the methods of turning on high...
Summary form only given. We have implemented a wide variety of charged-particle diagnostics on OMEGA, including magnet-based spectrometers (CPS); wedge-range-filter-based spectrometers (WFR); proton core image system (PCIS); proton radiography; and proton temporal diagnostics (PTD). Recent work has resulted in the comprehensive measurements of spatial-, temporal- and spectral- resolved energetic charged...
Summary form only given. Synthetic polycrystalline diamonds produced by chemical vapor deposition (CVD) are the leading candidates for neutron time-of-flight detectors at the National Ignition Facility (NIF). The detectors based on CVD diamonds are fast and radiation hard. In the last year, significant progress was made on the 60-beam OMEGA laser system in the development of CVD diamond detectors...
Summary form only given. Traditionally, inertial confinement fusion (ICF) ion temperature has been measured using neutron time-of-flight techniques. Long flight paths and collimation are used to allow the neutron temporal distribution to broaden relative to the detector response and to eliminate signals from unwanted X-rays and scattered neutrons. Radiation detectors based on chemical vapor deposition...
Summary form only given. The propagation of streamers in atmospheric pressure gases is of interest in plasma remediation of toxic gases, ozone production and functionalization of surfaces. The air (or other gases) in these non-pristine environments is often contaminated with particles or aerosols having sizes of 10s to 100s mum. These particles may have varying degrees of conductivity, from metallic...
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