Speaker
Description
High-quality electron beams are critical for generation of
intense X-ray pulses from free electron lasers. It was proposed
that complex thin films and heterostructures with semiconductor
photoemissive layers may be used in photocathodes to produce
electron beams with better quality. New developments in material
science allow designing alkali-antimonide photocathodes with
specific coatings that could significantly increase their
lifetime while not markedly degrading their quantum efficiency
(QE). Moreover, results from recent experiments demonstrated that
QE can be increased by optical interference absorption effects in
layered materials. Modeling of these complex photocathode
material designs is needed to predict and optimize their electron
emission properties. We apply recently developed extended moments
and thin film models to evaluate quantum efficiency and intrinsic
emittance from thin film cesium-telluride and alkali-antimonide
semiconductor photocathodes grown on different substrates. We
will discuss simulation results and suggest possible ways to
optimize electron emission properties from these thin films
photocathodes.
Funding Agency
USDOE
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