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Kyle McDonald - IEEE Xplore Author Profile

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This paper investigates the effects of high dose rate ionizing radiation and total ionizing dose (TID) on tantalum oxide ( TaOx) memristors. Transient data were obtained during the pulsed exposures for dose rates ranging from approximately 5.0 ×107 rad(Si)/s to 4.7 ×108 rad(Si)/s and for pulse widths ranging from 50 ns to 50 μs. The cumulative dose in these tests did not appear to impact the obser...Show More
The effects of high dose rate electron beam exposures on the electrical conductivity of fused silica and sapphire films are investigated via modern experimental techniques. Transient measurements have been obtained for dose rates ranging from 3×10 5 rad(Si)/s to 1×10 10 rad(Si)/s and for pulse widths ranging from 50 ns to 500 ns. The data indicate that the radiation-induced conductivity (RIC) has ...Show More
The long-range goal of the Z-pinch IFE program is to produce an economically-attractive power plant using high-yield Z-pinch-driven targets (~3 GJ) with low rep-rate per chamber (~0.1 Hz). He present mainline choice for a Z-pinch IFE power plant uses an LTD (Linear Transformer Driver) repetitive pulsed power driver, a Recyclable Transmission Line (RTL), a dynamic hohlraum Z-pinch-driven target, an...Show More
We report the effect of processing variables on the inversion layer electron mobility of (0001)-oriented 4H-SiC n-channel MOSFETs. The process variables investigated include: i) implant anneal temperature and ambient; ii) oxidation procedure; iii) postoxidation annealing in nitric oxide (NO); iv) type of gate material, and v) high-temperature ohmic contact anneal. Electron mobility is significantl...Show More
The effects of 1.8-MeV and 105-MeV proton irradiation on AlGaAs/GaAs heterojunction bipolar transistors (HBTs) are reported. For 1.8-MeV protons, the degradation of the transistors is caused by an increase in the base current and a large decrease in the collector current. The device degradation is much less after irradiation with 105-MeV protons, because of lower nonionizing energy loss (NIEL) in ...Show More
Results presented in this letter demonstrate that the effective channel mobility of lateral, inversion-mode 4H-SiC MOSFETs is increased significantly after passivation of SiC/SiO/sub 2/ interface states near the conduction band edge by high temperature anneals in nitric oxide. Hi-lo capacitance-voltage (C-V) and ac conductance measurements indicate that, at 0.1 eV below the conduction band edge, t...Show More
We report the effect on SiO/sub 2//SiC interface state density and effective oxide charge of different Si:C ratios (0.12 to 0.55) used during the growth of n-4H and n-6H-SiC epitaxial layers. We also report the effects of post-growth re-oxidation anneals and post- metalization anneals on the interface state density for both n- and p-4H-SiC. The interface trap density near the conduction band and t...Show More
The summer of 1990 marked the completion (on time and under budget) of a $14M very large reversed-field theta pinch experiment, called LSX (Large s Experiment), at STI Optronics. LSX is currently generating field reversed configurations (FRCs) with dimensions such that the physics has reactor relevance. The FRCs are formed using slow, programmed formation techniques which rely upon ohmic heating a...
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We are reporting preliminary experimental results on the injection and trapping in the NRL Modified Betatron. In internal injection, the beam is produced by a diode located within the chamber. Using one half of the 1 m toroidal vacuum chamber, the propagated beam current and displacement are monitored as functions of the applied magnetic fields (BZ, and the toroidal field, Bθ). Our preliminary res...Show More
The PBFA I accelerator has been tested and is operational at its full power rating of 30 TW. The PBFA I experiments demonstrated that the multi-modular approach to superpower generators is viable. The modular outputs can be combined in parallel or series-parallel combinations of the magnetically insulated transmission lines to power single, ion-beam diodes or imploding plasma sources. The coupling...Show More
The triggering of a high-voltage gas-insulated spark gap by an electron (e) beam has been investigated. Rise times of approximately 2.5 ns with subnanosecond jitter (~0.2 ns) have been obtained for 3-cm gaps charged at voltages as low as 50 percent of the self-breakdown voltage (varied up to 0.5 MV). The switch delay (including the e-beam diode) was 52 ns. The triggering e-beam pulse has a duratio...Show More