Berlin 2024 – wissenschaftliches Programm
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 2: Electron Sources and Cathodes
AKBP 2.6: Vortrag
Montag, 18. März 2024, 13:00–13:15, E 020
Na-K-Sb photocathodes for high brilliant electron beams — •Chen Wang1,2, Sonal Mistry1, Julius Kühn1, and Thorsten Kamps1,3 — 1HZB, Berlin, Germany — 2University of Siegen, Siegen, Germany — 3Humboldt University of Berlin, Berlin, Germany
My PhD project aims to develop Na-K-Sb photocathodes for the Superconducting RF Electron Accelerator LABorotory (Sealab/bERLinPro) at HZB. The photocathode requires high quantum efficiency (QE) and long operational and dark lifetimes. To achieve these requirements, the QE as well as the thermal/ chemical stability of Na-K-Sb photocathode is being studied in the photocathode lab at HZB with spectral response and X-ray Photoelectron Spectroscopy (XPS). In this contribution, we will present the initial correlation between the chemical composition of Na-K-Sb and its QE and stability, as well as its failure mechanism during thermal degradation and oxidation.
Keywords: photocathode; quantum efficiency; thermal/ chemical stability; stoichiometry