CrossRef Open Access 2022 12 sitasi

Operation of Cs–Sb–O activated GaAs in a high voltage DC electron gun at high average current

Jai Kwan Bae Matthew Andorf Adam Bartnik Alice Galdi Luca Cultrera +2 lainnya

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Abstrak

Negative Electron Affinity (NEA) activated GaAs photocathodes are the most popular option for generating a high current (>1 mA) spin-polarized electron beam. Despite its popularity, a short operational lifetime is the main drawback of this material. Recent works have shown that the lifetime can be improved by using a robust Cs–Sb–O NEA layer with minimal adverse effects. In this work, we operate GaAs photocathodes with this new activation method in a high voltage environment to extract a high current. We demonstrate that improved chemical resistance of Cs–Sb–O activated GaAs photocathodes allowed them to survive a day-long transport process from a separate vacuum system using a vacuum suitcase. During beam running, we observed spectral dependence on lifetime improvement. In particular, we saw a 45% increase in the lifetime at 780 nm on average for Cs–Sb–O activated GaAs compared to Cs–O activated GaAs.

Penulis (7)

Jai Kwan Bae

Matthew Andorf

Adam Bartnik

Alice Galdi

Luca Cultrera

Jared Maxson

Ivan Bazarov

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Bae, J.K., Andorf, M., Bartnik, A., Galdi, A., Cultrera, L., Maxson, J. et al. (2022). Operation of Cs–Sb–O activated GaAs in a high voltage DC electron gun at high average current. https://doi.org/10.1063/5.0100794

Akses Cepat

Lihat di Sumber doi.org/10.1063/5.0100794

Informasi Jurnal

Tahun Terbit: 2022
Bahasa: en
Total Sitasi: 12×
Sumber Database: CrossRef
DOI: 10.1063/5.0100794
Akses: Open Access ✓