This paper reports the results of two separate heavy ion irradiation experiments. In the first set, nanomaterial samples including single and multi wall carbon nanotubes and electrospun carbon nanofibers, with well-graphitized vapor grown carbon fibers as controls, were irradiated using a primary beam of Krypton-86 ions at 142 Amp MeV. The single and multi wall carbon nanotube samples sustained little damage from the highest radiation dose. In the second set, a gallium nitride nanowire-based field effect transistor was irradiated using a primary beam of Krypton-78 ions at 140 Amp MeV. The nanocircuit maintained normal function under high active bias and high radiation dose. Krypton-86 and Krypton-78 are representative of high-Z heavy ions encountered in a space radiation environment. Results from the pre-irradiation structure and optoelectronic characterization of the gallium nitride nanowires are also reported.
The generation of large amplitude, monochromatic current modulation of an intense relativistic electron beam (500 keV, 16 KA) by an external microwave source through a series of cavities has been studied via particle simulation. In the case of two cavity geometry, the nonlinear interaction of the second cavity with the partially modulated beam driven by various strengths of external rf source has been investigated. Various geometric configurations for cavity and gap size and cavity separation have been studied to assess feasibility and prioritized configurations for the efficient operation of relativistic klystron amplifier. A three cavity RKA was proposed for the future extra-high power microwave generation.
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