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Observation of large arrays of plasma filaments in air breakdown by 1.5-MW 110-GHz gyrotron pulses.
We report the observation of two-dimensional plasma filamentary arrays with more than 100 elements generated during breakdown of air at atmospheric pressure by a focused Gaussian beam from a 1.5-MW,Expand
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MgB2 Superconducting Thin Films with a Transition Temperature of 39 Kelvin
We fabricated high-quality caxis–oriented epitaxial MgB2 thin films using a pulsed laser deposition technique. The thin films grown on (1 1̄ 0 2) Al2O3 substrates have a transition temperature of 39Expand
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Plasma structures observed in gas breakdown using a 1.5 MW, 110 GHz pulsed gyrotron
Regular two-dimensional plasma filamentary arrays have been observed in gas breakdown experiments using a pulsed 1.5 MW, 110 GHz gyrotron. The gyrotron Gaussian output beam is focused to an intensityExpand
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High current-carrying capability in c-axis-oriented superconducting MgB2 thin films.
In high-quality c-axis-oriented MgB2 thin films, we observed high critical current densities ( J(c)) of approximately 16 MA/cm(2) at 15 K under self-fields comparable to those of cuprateExpand
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Experimental results for a 1.5 MW, 110 GHz gyrotron oscillator with reduced mode competition
A new result from a 110GHz gyrotron at MIT is reported with an output power of 1.67MW and an efficiency of 42% when operated at 97kV and 41A for 3μs pulses in the TE22,6 mode. These results are aExpand
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Anisotropic superconductivity in epitaxial MgB2 films
High-quality epitaxial MgB2 thin films prepared by pulsed laser deposition with T c = 39 K offer the opportunity to study the anisotropy and robustness of the superconducting state in magneticExpand
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Megawatt Power Level 120 GHz Gyrotrons for ITER Start-Up
We report operation of a 110 GHz gyrotron with 1.67 MW of output power measured in short pulses (3µs) at an efficiency of 42% in the TE22,6 mode. We also present a preliminary design of a 1 MW, 120Expand
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The Radarsat Antarctic Mapping Mission
The Radarsat Earth-observation satellite was launched on November 4, 1995 aboard a Delta 2 rocket. Equipped with a sophisticated synthetic aperture radar (SAR), Radarsat can produce images ofExpand
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Experimental observation of the effect of aftercavity interaction in a depressed collector gyrotron oscillator
This paper presents the experimental observation of the effect of an aftercavity interaction (ACI) in a depressed collector gyrotron oscillator. The gyrotron generates an output power of 1.5MW atExpand
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Experimental Results on a 1.5 MW, 110 GHz Gyrotron with a Smooth Mirror Mode Converter
We present an internal mode converter (IMC) design for a 1.5 MW, 110 GHz gyrotron operating in the TE22,6 mode. The launcher, designed using the codes Surf3d and LOT, converts the cavity waveguideExpand
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