SMuK 2023 – scientific programme

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 1: Particle and Photon Sources

AKBP 1.4: Talk

Monday, March 20, 2023, 16:45–17:00, CHE/0183

Development of Multi-alkali antimonides photocathodes for high brightness photoinjectors — •Sandeep Mohanty¹, Mikhail Krasilnikov¹, Anne Oppelt¹, Frank Stephan¹, Daniele Sertore², Laura Monaco², Carlo Pagani³, and Wolfgang Hillert⁴ — ¹DESY Zeuthen, Germany — ²Istituto Nazionale di Fisica Nucleare - LASA, Segrate, Italy — ³Università degli Studi di Milano & INFN, Segrate, Italy — ⁴University of Hamburg

Multi-alkali antimonide photocathodes can have high quantum efficiency similar to UV-sensitive (Cs2Te) photocathodes, but with the advantages of photoemission sensitivity in the green wavelength and a significant reduction in the mean transverse energy of photoelectrons. In order to optimize and better understand the photo emissive film properties of KCsSb photocathodes, a batch of two photocathodes with different thicknesses was grown on molybdenum substrates via a sequential deposition method in a new preparation system at INFN LASA. During the deposition, a "multi-wavelengths" diagnostic, i.e. the measurements of the real-time photocurrent and reflectivity at different wavelengths (in the range from 254 nm - 690 nm) has been applied.The optical spectra of these semiconductors provide a rich source of information on their electronic properties.In this report, we present and discuss the experimental results obtained from the two different thickness KCsSb photocathodes, along with the effect of Sb thickness on the cathode's properties.