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The performance of tungsten-rhenium (W-Re) mixed-matrix cathodes of varying compositions was studied. The work function, when the tungsten percentage is 50 plusmn 25%, is close to that of a Re-coated cathode. The I-V characteristics show an emission anomaly. It was found that the patch fields are not the main reason; rather, it is the field enhancement which is responsible for this anomaly. The emission...
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