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<p>Polarized electrons play an important role in high-energy and nuclear physics, and their properties have also been exploited in ultrafast electron microscopy. Currently, gallium arsenide crystals illuminated by circular polarized infrared laser light are commonly used for generating polarized electrons. However, the achievable accelerating voltage and the gradient of these electrostatic sources limit the beam quality and quantity. A solution could be to combine gallium arsenide photocathodes with radio-frequency electron guns, which are capable of accelerating beams with significantly higher gradients and voltage. Here we report the successful operation of a gallium arsenide photocathode in a superconducting radio-frequency gun. Our findings are relevant for future sources of polarized electrons.</p>

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Towards advanced polarized electron sources

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月2日

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  • Vladimir N. Litvinenko,
  • Nikhil Bachhawat,
  • Jean Clifford Brutus,
  • Luca Cultrera,
  • Kenneth Decker,
  • Mengjia Gaowei,
  • Patrick Inacker,
  • Yichao Jing,
  • Jun Ma,
  • Kali Prasanna Mondal,
  • Geetha Narayan,
  • Igor Pinayev,
  • Freddy Severino,
  • Kai Shih,
  • John Skaritka,
  • Loralie Smart,
  • Yatming Than,
  • John Walsh,
  • Erdong Wang,
  • Gang Wang,
  • Dan Weiss

摘要

Polarized electrons play an important role in high-energy and nuclear physics, and their properties have also been exploited in ultrafast electron microscopy. Currently, gallium arsenide crystals illuminated by circular polarized infrared laser light are commonly used for generating polarized electrons. However, the achievable accelerating voltage and the gradient of these electrostatic sources limit the beam quality and quantity. A solution could be to combine gallium arsenide photocathodes with radio-frequency electron guns, which are capable of accelerating beams with significantly higher gradients and voltage. Here we report the successful operation of a gallium arsenide photocathode in a superconducting radio-frequency gun. Our findings are relevant for future sources of polarized electrons.