Research and Development of Photon Activated Thermionic Cathodes for Excimer Lasers.
Final rept. 1 Oct 84-30 May 85,
THERMO ELECTRON CORP WALTHAM MASS
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A combined experimental and analytical study was designed to determine whether electron emission from thermally pulsed laser heated cesiated surfaces is due to thermally non-equilibrated thermionic effects, and, if so, to provide a description of the relevant physical processes and their limitations. The experiments were performed with specific pulses of laser radiation incident on tungsten surfaces immersed in a low pressure cesium vapor. The measurements indicated that thermionically generated space charge limited currents are generated, and that their magnitudes could only be accounted for by thermal nonequilibrium effects. The rapidly rising current pulses were often observed to transition into a plasma dominated flow that could be curtailed by diode charges. These experiments and conclusions are discussed in this report in more detail. Keywords Laser heating Diode Thermionic emission Nonequilibrium Cesium tungsten.
- Lasers and Masers
- Radiation and Nuclear Chemistry