Activation Layer Stabilization of High Polarization Photocathodes in Sub-Optimal RF Gun Environments | Zendy

G. A. Mulhollan | Zendy

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Activation Layer Stabilization of High Polarization Photocathodes in Sub-Optimal RF Gun Environments

Author(s) -

G. A. Mulhollan

Publication year - 2010

Language(s) - English

Resource type - Reports

DOI - 10.2172/992578

Subject(s) - photocathode , alkali metal , materials science , x ray photoelectron spectroscopy , amorphous solid , polarization (electrochemistry) , optoelectronics , analytical chemistry (journal) , chemistry , electron , physics , crystallography , nuclear magnetic resonance , organic chemistry , quantum mechanics , chromatography

We have developed an activation procedure by which the reactivity to CO{sub 2}, a principal cause of yield decay for GaAs photocathodes, is greatly reduced. The use of a second alkali in the activation process is responsible for the increased immunity of the activated surface. The best immunity was obtained by using a combination of Cs and Li without any loss in near bandgap yield. Optimally activated photocathodes have nearly equal quantities of both alkalis.

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