TU Darmstadt / ULB / TUbiblio

A test system for optimizing quantum efficiency and dark lifetime of GaAs photocathodes

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
Article, Bibliographie

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.

Item Type: Article
Erschienen: 2019
Creators: Kurichiyanil, N. ; Enders, J. ; Fritzsche, Y. ; Wagner, M.
Type of entry: Bibliographie
Title: A test system for optimizing quantum efficiency and dark lifetime of GaAs photocathodes
Language: English
Date: 30 August 2019
Publisher: IOP Publishing
Journal or Publication Title: Journal of Instrumentation
Volume of the journal: 14
DOI: 10.1088/1748-0221/14/08/P08025
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.

Uncontrolled Keywords: S-DALINAC, Photo-CATCH, Accelerator, Electron Source, Photocathode, NEA, GRK 2128, SFB 634, HIC for FAIR, BMBF 05H15RDRB1, BMBF 05H18RDRB1, Instrumentation
Divisions: 05 Department of Physics
05 Department of Physics > Institute of Nuclear Physics
05 Department of Physics > Institute of Nuclear Physics > Experimentelle Kernphysik
05 Department of Physics > Institute of Nuclear Physics > Experimentelle Kernphysik > Technische Kernphysik und Beschleunigerphysik
Date Deposited: 29 Oct 2019 12:20
Last Modified: 02 Dec 2021 11:15
PPN:
Export:
Suche nach Titel in: TUfind oder in Google
Send an inquiry Send an inquiry

Options (only for editors)
Show editorial Details Show editorial Details