Abstract
Long lifetime polarized electron beam production from negative electron affinity GaAs activated with Sb-Cs-O: Trade-offs between efficiency, spin polarization, and lifetime
Highlights
Photocathodes that produce highly spin polarized electron beams play a critical role in current and future nuclear and high energy physics facilities, such as the Electron Ion Collider and the International Linear Collider [1,2,3]
The operation of all photocathodes based on GaAs with photon energy near the band gap energy is possible only by activation to negative electron affinity (NEA) conditions, which is achieved at the vacuum interface of the photocathode upon exposure to Cs and oxygen or NF3 [7,8]
All the other samples were activated to NEA using the procedure described below
Summary
Photocathodes that produce highly spin polarized electron beams play a critical role in current and future nuclear and high energy physics facilities, such as the Electron Ion Collider and the International Linear Collider [1,2,3]. Spin polarized electron sources are critical for various forms of electron microscopy capable of probing the magnetic properties of materials [4,5].
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