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Summary form only given. The key requirements of nanotube formation are an atomic carbon source and a source of nanometal particles. Carbon nanotubes (CNTs) have been synthesized by an argon/nitrogen microwave plasma-torch using a mixture of acetylene and vapor-phase iron pentacarbonyl at the atmospheric pressure. The synthesized CNTs have been analyzed by scanning electron-microscopy (SEM), field-emission...
Summary form only given. The low pressure vacuum arc cleaning is a smart processing way of removing an oxide layer. The chemical and mechanical ways are mostly used to remove it, currently. However, both have severe problems such as liquid wastes, dust and noise. In the case of low pressure arc cleaning, there is only one place where the waste comes, from the oxide layer. In addition, because the...
Summary form only given. The Sandia Z dynamic hohlraum radiation drive produces high radiation powers and energies. Using these high powers and energies, a new in-situ diagnostic has been developed and tested, that uses the super-sonic to sub-sonic transition of a Marshak radiation wave in a cylindrical block of SiO2 aerogel foam. When this transition takes place, a shock is launched, with a velocity...
Summary form only given. X-pinch experiments using 188 alloy and combined Mo/W wires were implemented at the Cornell 450 kA XP facility. The spatially resolved, time-gated and integrated X-ray line spectra have been recorded using different crystal spectrometers (time-gated ADP and time-integrated mica crystal spectrometers). In particular, K-shell and L-shell X-ray line spectra from Cr, Co, and Ni...
Summary form only given. The thermal cutting industry has seen significant changes in markets and processes since the 80's. The main cutting processes of this industry are oxy-fuel, plasma and laser cutting. Laser dominates the thin gauge materials market producing high quality cuts. This is followed by high definition plasma that appeared in the early 90's. Plasma cutting processes are able to cut...
Summary form only given. Radially resolved X-ray spectra were recorded with a time resolved Johann spectrometer on Double EAGLE. Four percent Cl was added as an optically thin trace element to the Ar in individual shells of multi shell gas-puff loads to study the implosion and radiation characteristics of these shells. The ratios of observed Cl line intensities were compared with predicted values...
Summary form only given. Nozzles for high current, short implosion time (<100 ns) Z-pinches have historically produced a single thin shell of gas, typically a few cm in diameter. As interest in longer implosion time drivers has increased in the last several years, larger diameter nozzles have been developed. In order to minimize the effects of Rayleigh-Taylor instabilities, distributions consisting...
Summary form only given. We will present experimental observations of the effect of the radial electric field on plasma formation and implosion dynamics in wire array Z-pinches. Experiments were performed on the 1 MA MAGPIE generator, with 8 mm diameter Al wire arrays in configurations in which the polarity of the radial electric field was reversed midway along the wires of an array. The wire cores...
Summary form only given. Drexel Plasma Institute has several projects that exploit gliding arc as a source of atmospheric pressure transitional plasma. Transitional plasma or transplasma has parameters in the range between cold and thermal plasmas. Transplasma offers distinct advantages in some processes. We are using transplasma generated by gliding arc (GA) in different systems for the following...
Summary form only given. Nanoparticles of various materials are building blocks and important constituents of ceramics and metal composites, pharmaceutical and food products, energy related products such as solid fuels and batteries, and electronics related products. The ability to manipulate the surface properties of these particles through deposition of one or more materials can greatly enhance...
Summary form only given. Research is underway to investigate radio frequency (RF) priming of relativistic magnetrons for rapid startup and reduced mode competition. Experiments utilize the MELBA-C to drive the Titan 6-vane relativistic magnetron at parameters: V=-300 kV, I=1-10 kA, e-beam pulselength=0.5 musec, microwave power=100-500 MW, microwave frequency=1-1.3 GHz (with tuning). MELBA-C's ceramic...
Summary form only given. A study of breakdown voltage as a function of electrode geometry in pseudospark discharges is presented. The presence of the hollow cathode in a pseudospark discharge results in a variable ionization volume as a function of electrode diameter and anode voltage. We derive approximate Paschen characteristics using particle balance arguments in a vacuum electric field. The result...
Summary form only given. Laser wakefield acceleration promises the production of high energy electrons from table-top accelerators. External injection of a relativistic electron bunch into a laser wakefield requires bunches of the order of the plasma wavelength, typically 100 fs. Acceleration fields necessary to create these bunches have to be of the order GV/m. RF technology has reached its limit...
Summary form only given. The possibility of obtaining gated images of a burning inertial confinement fusion (ICF) target with low background signals have renewed interest in neutron imaging as an ICF diagnostic. Using neutron time of flight (nTOF) techniques combined with a coded aperture, the burning core (hot spot) of the target can be imaged recording the 14 MeV neutrons, while the down-scattered,...
Summary form only given. We present a PIC code MAGIC simulation of charge density evolution in time in a 20-100 ns class plasma erosion opening switch, which is intended for use in a TW high power microwave system. The conclusions are: (a) the higher the plasma density, the higher the stored magnetic energy, however, higher plasma density usually means larger volume, which changes the impedance matching...
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