The LightHouse project is a novel industrial application of an electron accelerator for the production of medical isotopes (99Mo) as an alternative to nuclear reactors.
In the framework of the SMART project of the company Institut National des Radioéléments (IRE), RI is responsible for the superconducting electron accelerator which includes the DC photoinjector, the SRF modules and the...
For the high-precision measurements in the experiments at the new Mainz Energy Recovering Superconducting Accelerator (MESA), it is necessary to know exactly the long-term spin properties of the electron beam. For this purpose, a test setup has been built at the Institute for Nuclear physics. Different preparation methods of a photocathode with nitrogen trifluoride and oxygen are compared.The...
Multi-alkali antimonides have been proposed as a promising class of photocathode materials for particle accelerators. First-principles results have recently complemented the experimental efforts in the characterization of these systems [1]. However, most of the existing studies focus on bulk crystals and still little is known about their surface properties. We fill this gap with an ab initio...
A surface modification technique is described that significantly enhances the photoelectric quan-
tum efficiency (QE) of Nb at 248 nm by more than two orders of magnitude, thereby making this
material suitable potentially as a cathode for superconducting radiofrequency (SRF) photoinjectors. The approach uses ultra-thin-film metallic coatings that exploit proximity coupled superconductivity,...
Metal photocathodes are widely utilised for their ease of use, high durability and fast response time. However, the high work function (WF) and low quantum efficiency (QE) typically observed in metals necessitates the use of high power deep UV lasers. Metal oxide films on metals have been shown to produce a surface with a lower WF and improved QE* whilst maintaining photocathode...
The electron beam quality of a photocathode-based electron source is limited by the achievable mean transverse energy (MTE). The Liouville theorem states that the total emittance of a beam cannot improve as it propagates through an accelerator, only manipulated using lattice optics. Therefore minimising the intrinsic emittance of a photocathode is important. This alongside other factors such...
A photocathode composed of a Pb layer deposited on Nb substrate is an attractive solution proposed for fully superconducting, radio-frequency electron gun to be used in the linear accelerator of the European X-ray free electron laser (Eu-XFEL) operating at Deutsches Elektronen Synchrotron (DESY) and in other, similar devices. Much effort has been put in development of deposition and...
The goal of the Sealab/bERLinPro project is to build a new generation superconducting RF electron accelerator at HZB. Therefore, a photocathode with high QE and long operation lifetime is required for this project. Multi-alkali antimonide photocathodes deposited on Mo substrate is chosen for this application due to its high QE (>1%) at visible wavelengths and good thermal conductivity....
A UK X-FEL will require a high-performance photocathode to generate an electron beam with the necessary qualities. Caesium Telluride is a candidate material for this photocathode application.
The surface characteristics of a photocathode affect many important factors of the photoemission process including the photoemission threshold, the intrinsic emittance and the quantum efficiency....
Monte Carlo simulation study of Cs2Te
Gowri Adhikari1,7, Houjun Qian1,2, Peng-Wei Huang3, Mikhail Krasilnikov1, Matthias Gross1, Frank Stephan1, Sven Lederer6, Pavel Juarez6, Caterina Cocchi4, Holger-Dietrich Sassnick4, Daniele Sertore5, and Laura Monaco5
1 Deutsches Elektronen-Synchrotron DESY, Platanenalle 6, 15738 Zeuthen, Germany
2 Zhangjiang Laboratory, Shanghai 201210, China
3...
