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Heat removal in metal structures is often the limiting factor in high power, high frequency microwave tube devices. As higher critical heat flux cooling techniques are found, the operating power of the microwave device may be increased if other limiting factors are not of importance. Larger output powers may be realized for brief periods in time at the expense of operating in a pulsed power and/or...
The recently patented UNLV electromagnetic (EM) dot sensor measures the rate of change of the electric flux density and the magnetic flux density at the same point in space simultaneously over time. This single device performs the function of two to four sensors distributed in space. The calibration setup of the EM-dot is presented ultimately leading to a pair of calibration factors.
Electron stimulated electron desorption yielding secondary electron emission is to be examined both experimentally and computationally. A novel secondary electron emission test stand at UNLV housing a particle position detector maps the evolution of the spatial distribution of electron beam stimulated secondary electrons emitted from a metal target. Electrons emitted from the target in the drift free...
Summary form only given. Secondary electron emission (SEE) can potentially lead to beam instabilities, material degradation and r.f. breakdown. The past SEE studies have deduced secondary electron yield by invoking a conservation of charge without the need to experimentally account for all measurables. In the spatial distribution studies of SEE, one may not invoke conservation of charge without some...
The Nevada Shocker powered by nine 0.28 muF capacitors in a Marx Bank configuration yielding a maximum standup voltage and energy of 540 kV and 4.54 kJ respectively drives a 14.2 nF (in charging mode) Blumlein. The Blumlein with self-breaking water switch generates a 46 ns (theory) to 50 ns (experimental) pulse guided by a 7 Omega discharge transmission line to a parallel plate diode in a 10-6 Torr...
Microdiameter dust particles in a viscous air medium are to be transported by a bi-planar arrangement of flat parallel plate electrodes. Sequential shifting of the static potentials on the electrodes is employed to guide the particles. The two dimensional configuration of these quasi-electrostatic fields in the semi-infinite guide composed of the parallel plate electrodes is theoretically and numerically...
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