Kurichiyanil, N. ; Enders, J. ; Fritzsche, Y. ; Wagner, M. (2019)
A test system for optimizing quantum efficiency and dark lifetime of GaAs photocathodes.
In: Journal of Instrumentation, 14
doi: 10.1088/1748-0221/14/08/P08025
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Gallium-arsenide-based photocathodes are used for a variety of applications, including electron-beam production for particle accelerators. An ultra-high vacuum teststand has been developed for cleaning and preparation of photocathodes. First studies using the apparatus were carried out investigating quantum efficiency and vacuum (dark) lifetimes of GaAs photcathodes that were prepared using different procedures involving Cs, Li, and O2. While the two-stage activation procedure with Cs and O2 yielded the highest quantum efficiency of up to (25.9 +- 1.3)% at wavelength 405 nm, the vacuum lifetime of cathodes activated with Cs, Li, and O2 using a two-stage process exceeded those obtained in single-stage process by more than a factor of three.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2019 |
| Autor(en): | Kurichiyanil, N. ; Enders, J. ; Fritzsche, Y. ; Wagner, M. |
| Art des Eintrags: | Bibliographie |
| Titel: | A test system for optimizing quantum efficiency and dark lifetime of GaAs photocathodes |
| Sprache: | Englisch |
| Publikationsjahr: | 30 August 2019 |
| Verlag: | IOP Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of Instrumentation |
| Jahrgang/Volume einer Zeitschrift: | 14 |
| DOI: | 10.1088/1748-0221/14/08/P08025 |
| Kurzbeschreibung (Abstract): | Gallium-arsenide-based photocathodes are used for a variety of applications, including electron-beam production for particle accelerators. An ultra-high vacuum teststand has been developed for cleaning and preparation of photocathodes. First studies using the apparatus were carried out investigating quantum efficiency and vacuum (dark) lifetimes of GaAs photcathodes that were prepared using different procedures involving Cs, Li, and O2. While the two-stage activation procedure with Cs and O2 yielded the highest quantum efficiency of up to (25.9 +- 1.3)% at wavelength 405 nm, the vacuum lifetime of cathodes activated with Cs, Li, and O2 using a two-stage process exceeded those obtained in single-stage process by more than a factor of three. |
| Freie Schlagworte: | S-DALINAC, Photo-CATCH, Accelerator, Electron Source, Photocathode, NEA, GRK 2128, SFB 634, HIC for FAIR, BMBF 05H15RDRB1, BMBF 05H18RDRB1, Instrumentation |
| Fachbereich(e)/-gebiet(e): | 05 Fachbereich Physik 05 Fachbereich Physik > Institut für Kernphysik 05 Fachbereich Physik > Institut für Kernphysik > Experimentelle Kernphysik 05 Fachbereich Physik > Institut für Kernphysik > Experimentelle Kernphysik > Technische Kernphysik und Beschleunigerphysik |
| Hinterlegungsdatum: | 29 Okt 2019 12:20 |
| Letzte Änderung: | 02 Dez 2021 11:15 |
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