Abstract
Over the years, the generation and acceleration of ultra-short, high quality electron beams has attracted more and more interest in accelerator science. Electron bunches with these properties are necessary to operate and test novel diagnostics and advanced high-gradient accelerating schemes, such as plasma accelerators and dielectric laser accelerators. Furthermore, several medical and industrial applications require high-brightness electron beams. The dedicated R&D facility ARES at DESY (Deutsches Elektronen-Synchrotron) will provide such probe beams in the upcoming years. After the setup of the normal-conducting, radio-frequency (RF) photoinjector and linear accelerating structures, ARES successfully started the beam commissioning of the RF gun. This paper gives an overview of the ARES photoinjector setup and summarizes the results of the gun commissioning process. The quality of the first electron beams is characterized in terms of charge, momentum, momentum spread and beam size. Additionally, the dependencies of the beam parameters on RF settings are described. All measurement results of the characterized beams fulfill the requirements for operating the ARES linac with this RF photoinjector.
Highlights
SINBAD (Short INnovative Bunches and Accelerators at DESY) [1] is an accelerator R&D platform in the former DORIS accelerator tunnel at DESY, Hamburg
The SINBAD-ARES setup hosts a normal conducting RF photoinjector generating a low charge electron beam, which is afterwards accelerated by an S-band linac section
After RF conditioning of the gun cavity, a first electron beam was generated and detected at the end of October 2019. This important milestone in the ARES project marked the beginning of the RF photoinjector commissioning and the first electron beam’s characterization
Summary
SINBAD (Short INnovative Bunches and Accelerators at DESY) [1] is an accelerator R&D platform in the former DORIS accelerator tunnel at DESY, Hamburg. The SINBAD-ARES setup hosts a normal conducting RF photoinjector generating a low charge electron beam, which is afterwards accelerated by an S-band linac section. After RF conditioning of the gun cavity, a first electron beam was generated and detected at the end of October 2019. This important milestone in the ARES project marked the beginning of the RF photoinjector commissioning and the first electron beam’s characterization. The chosen cathode materials, molybdenum Mo for the first beam and cesium-telluride Cs2Te for the beam commissioning (higher bunch charge), require UV laser light (257 nm) for electron generation with maximum efficiency [18]. The generated electron beam is immediately accelerated in the RF gun cavity up to 5 MeV in order to counteract space charge effects. By leveraging the numerous possibilities to interface with the control system (MATLAB, Python, Java, C/C++), the operators contributed software both for commissioning purposes and for day-to-day operation of the machine
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