Over the last decade, alkali-antimonides have been investigated as high QE cathodes in green light and more recently as ultra-low intrinsic emittance cathodes in nearthreshold red wavelengths at cryogenic temperatures [1]. Nano-meter scale surface non-uniformities (physical roughness and chemical roughness or work function variations) are thought to limit the smallest possible emittance from these materials at the photoemission threshold under cryogenic conditions [2]. Despite this, the surfaces of alkali antimonides have not been well characterized in terms of the surface non-uniformities. Here, we present measurements of surface non-uniformities of alkali-antimonide thin films using several surface characterization techniques like atomic force microscopy, kelvin probe force microscopy, low energy electron microscopy and near-threshold photoemission electron microscopy. This helps show how such non-uniformities limit the intrinsic emittance.

Physical and Chemical Roughness of Alkali-Animonide Cathodes

A. Galdi
Investigation
;
2018-01-01

Abstract

Over the last decade, alkali-antimonides have been investigated as high QE cathodes in green light and more recently as ultra-low intrinsic emittance cathodes in nearthreshold red wavelengths at cryogenic temperatures [1]. Nano-meter scale surface non-uniformities (physical roughness and chemical roughness or work function variations) are thought to limit the smallest possible emittance from these materials at the photoemission threshold under cryogenic conditions [2]. Despite this, the surfaces of alkali antimonides have not been well characterized in terms of the surface non-uniformities. Here, we present measurements of surface non-uniformities of alkali-antimonide thin films using several surface characterization techniques like atomic force microscopy, kelvin probe force microscopy, low energy electron microscopy and near-threshold photoemission electron microscopy. This helps show how such non-uniformities limit the intrinsic emittance.
2018
978-3-95450-184-7
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11386/4858064
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