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Ultrashort Pulse Laser Filamentation Electrical And Optical Diagnostic Comparison, James E. Wymer
Ultrashort Pulse Laser Filamentation Electrical And Optical Diagnostic Comparison, James E. Wymer
Optical Science and Engineering ETDs
Results presented here examine the effect of changing gas pressure on the radio frequency (RF) emissions of an ultrashort pulse laser filament plasma and how those emissions vary longitudinally in the laser focal region. We use a WR284 rectangular waveguide with a 1.5 cm hole that allows the beam through. A 3.2 GHz microwave signal is emitted in the waveguide, and signals are received through a waveguide-to-coax antenna connected to an HP8470B Schottky diode. By enabling and disabling the 3.2 GHz signal, we measure both the self-emitted RF from a USPL filament and subsequently the degree of attenuation a filament …
Experimental Verification Of A6 Magnetron With Permanent Magnet, Andrew J. Sandoval
Experimental Verification Of A6 Magnetron With Permanent Magnet, Andrew J. Sandoval
Electrical and Computer Engineering ETDs
A compact A6 relativistic magnetron with diffraction output using a transparent cathode, simple mode-converter, and a permanent magnet were simulated and tested at the University of New Mexico (UNM) for the Office of Naval Research. The standard compact MDO with a simple mode converter and transparent cathode radiates a TE11 mode axially through a cylindrical horn antenna. The magnetic field, essential for magnetron operation, is provided by a Neodymium Iron Boron (NeFeB) GradeN40M rare earth magnet. The permanent magnet eliminates the need for a pulsed magnet and accompanying circuit, significantly reducing the size of the system. A permanent magnetic field …