Abstract
For pulsed X-ray measurements as applied, for example, in high temperature plasma diagnostics, it has been established that the cesium iodide photocathode is very efficient for X-ray diode and streak camera applications. Its quantum yield (electrons/incident photon) is ten to one-hundred times higher than that for the gold photocathode in the 100–10 000 eV region. The width of its secondary electron energy distribution is appreciably less than that for gold, allowing time resolved, streak camera measurements to be extended into the picosecond region. In this note an experimental study is described which demonstrates that the cesium iodide photocathode quantum yield and secondary electron energy distribution can be stable under practical conditions of preparation, handling, storage and short period exposures to the atmosphere.
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