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High-Brightness Continuous-Wave Electron Beams from Superconducting Radio-Frequency Photoemission Gun.
I Petrushina1,2, V N Litvinenko1,2, Y Jing1,2
1Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794, USA.
Physical Review Letters
|July 9, 2020
Summary
Superconducting radiofrequency electron guns with advanced photocathodes are achieving record performance. This breakthrough enables high-charge, low-emittance electron beams for diverse scientific applications.
Area of Science:
- Particle accelerators
- Quantum electronics
- Materials science
Background:
- Continuous-wave photoinjectors are crucial for advanced scientific tools.
- High accelerating gradients are key to next-generation applications.
- Existing technologies face limitations in performance and longevity.
Purpose of the Study:
- To report a record-performing superconducting radiofrequency (SRF) electron gun.
- To demonstrate sustained operation with a novel photocathode.
- To showcase the potential for high-brightness electron beam generation.
Main Methods:
- Utilized a superconducting RF electron gun.
- Employed a cesium potassium antimonide (CsK₂Sb) photocathode.
- Operated the system continuously for extended periods.
Main Results:
- Achieved record performance in an SRF electron gun.
- Generated high charge electron bunches (up to 10 nC/bunch).
- Attained low transverse emittances and sustained operation for months on a single photocathode.
Conclusions:
- The developed SRF electron gun represents a significant advancement.
- This technology paves the way for new generations of X-ray free electron lasers and high-brightness hadron beams.
- Opens a new era for generating high-power, high-brightness electron beams.
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