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An experiment is underway to study the performance of several materials as field-emission cathodes for low voltage ({le} 100 kV), repetitive ( 100 A/cm{sup 2}, with a long lifetime (> 10{sup 6} shots), and reproducible from shot-to-shot would be valuable in the new generation of repetitively pulsed electron beam sources useful in industrial, military, and research applications. The goal of this effort is to identify high-current-density cathodes that have reproducible and uniform emission, when operated at applied diode potentials {le} 100more » kV. In addition, this cathode should provide high durability in repetitive ({approx} 1kHz) operation and not produce fast moving plasmas which short circuit, i.e. close, the diode anode-cathode (AK) gap.« less |
