1–6 Jun 2025
Taipei International Convention Center (TICC)
Asia/Taipei timezone

Development and operational performance of multi-alkali antimonide photocathodes

TUPS067
3 Jun 2025, 16:00
2h
Exhibiton Hall A _Salmon (TWTC)

Exhibiton Hall A _Salmon

TWTC

Poster Presentation MC2.T02 Electron Sources Tuesday Poster Session

Speaker

Sandeep Mohanty (Deutsches Elektronen-Synchrotron DESY)

Description

Multi-alkali antimonide photocathodes, particularly potassium–cesium-antimonide, have gained prominence as photoemissive materials for electron sources in high-repetition-rate FEL applications due to their properties, such as low thermal emittance and high sensitivity in the green wavelength. To explore the potential of these materials in high-gradient RF guns, a collaborative effort was undertaken between DESY PITZ and INFN-LASA to develop and study multi-alkali photocathode materials.
A batch of three KCsSb photocathodes and one NaKSb(Cs) photocathode was grown on molybdenum substrates using a sequential deposition method in the new preparation system at INFN LASA. These cathodes were successfully transferred and tested in the high-gradient RF gun at PITZ. Following the tests, a post-operational optical study was conducted on all the cathodes.
Based on these findings, efforts are underway to optimize the fabrication recipes for KCsSb and NaKSb(Cs) photocathodes to achieve lower field emission and longer lifetimes. This contribution summarizes the experimental results of the production, operational performance, and post-usage analysis of the current batch of cathodes.

Funding Agency

This work was supported by the European XFEL research and development program.

Region represented Europe
Paper preparation format LaTeX

Author

Sandeep Mohanty (Deutsches Elektronen-Synchrotron DESY)

Co-authors

Anne Oppelt (Deutsches Elektronen-Synchrotron DESY) Daniele Sertore (Istituto Nazionale di Fisica Nucleare) Frank Stephan (Deutsches Elektronen-Synchrotron DESY) Laura Monaco (Istituto Nazionale di Fisica Nucleare) Mikhail Krasilnikov (Deutsches Elektronen-Synchrotron DESY) Xiangkun Li (Deutsches Elektronen-Synchrotron DESY)

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