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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Vancil, B. Schmidt, V. Lorr, J. Ohlinger, W. |
| Copyright Year | 2014 |
| Description | Author affiliation: e Beam Inc., Beaverton, OR, USA (Vancil, B.; Schmidt, V.; Lorr, J.) |
| Abstract | A hollow cathode was fabricated from scandium oxide-doped one-micron tungsten powder. The prepared powder was pressed into a solid billet and sintered in hydrogen. The sintered billet was electron discharge machined to create the hollow emitter. A unique test vehicle was developed consisting of a central wire as anode, a glass-rodded support structure, and a glass envelope, pumped and baked at $400^{o}$ C. The cathode was tested in both vacuum and one torr of xenon. The vacuum was maintained with barium getters flashed on the internal surface of the envelope. A capsule containing xenon was enclosed in the vacuum envelope. After vacuum testing, the capsule was broken and cathode emission in a xenon discharge was measured. About 2 $amps/cm^{2}$ space-charge-limited emission was achieved in vacuum at $945^{o}$ $C_{b}(W).$ In xenon, the current was 50 amps $(17A/cm^{2})$ temperature-limited at $880^{o}$ $C_{b}(W).$ By contrast, an all-tungsten emitter of the same geometry required a temperature of $1080^{o}$ $C_{b}(W)$ to achieve the same current. |
| Starting Page | 57 |
| Ending Page | 58 |
| File Size | 701951 |
| Page Count | 2 |
| File Format | |
| ISBN | 9781479934263 |
| DOI | 10.1109/IVEC.2014.6857488 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2014-04-22 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Cathodes Xenon Tungsten Powders Discharges (electric) Vehicles Glass ion propulsion Scandate hollow cathode |
| Content Type | Text |
| Resource Type | Article |
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