Abstract

The Advanced Continuous-wave Electron (ACE) injector group at the Coherence and Quantum Technology (CQT) group of the Eindhoven University of Technology is developing a GHz repetition-rate electron injector where a low emittance and high repetition-rate are simultaneously required. The injector is based on a high-quality DC thermionic gun and two normal conducting RF cavities utilizing dual-mode resonance frequencies in the 1.5–3 GHz range. In the first phase, the installation and commissioning of ACE’s electron gun were completed. In this next phase, two dual modes RF cavities are designed for chopping and compressing of a DC electron beam. This paper focuses on the RF design and measurements of these cavities, demonstrating the claimed quality and performance.

Highlights

  • The performance of any electron accelerator crucially depends on the abilities of its electron source

  • A wide variety of electron beambased applications requires electron sources capable of generating a beam with low transverse emittance, short bunch length, and low energy spread [1,2,3]. Such beams can be used in ultrafast electron diffraction [4,5] and microscopy [6], free electron lasers [7] and other light sources [8]

  • We present a new dual-mode RF cavity design which can be used for both chopper and compressor cavities in the Advanced Continuous-wave Electron (ACE) injector

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Summary

Introduction

The performance of any electron accelerator crucially depends on the abilities of its electron source. A wide variety of electron beambased applications requires electron sources capable of generating a beam with low transverse emittance, short bunch length, and low energy spread [1,2,3]. We present a new dual-mode RF cavity design which can be used for both chopper and compressor cavities in the ACE injector This injector is designed to provide up to 70 pC electron bunches at a 1.5 GHz repetition rate resulting in a high average current. The properties of this gun are significantly different from conventional guns, so that various applications may exist [3,21,22].

Chopping section
Chopper cavity characterization
Power reflection and transmission
Field profile
Tuning plungers
Compression section
Particle tracking simulation
Conclusions
Rajabi
Full Text
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