Scholarlink

<p>Electron beam injectors are pivotal components of large-scale scientific instruments, such as synchrotron radiation sources, free-electron lasers, and electron-positron colliders. The quality of the electron beam produced by the injector critically influences the performance of the entire accelerator-based scientific research apparatus. The injectors of such facilities usually use photocathode and thermionic-cathode electron guns. Although the photocathode injector can produce electron beams of excellent quality, its associated laser system is massive and intricate. The thermionic-cathode electron gun, especially the gridded electron gun injector, has a simple structure capable of generating numerous electron beams. However, its emittance is typically high. In this study, methods to reduce beam emittance are explored through a comprehensive analysis of various grid structures and preliminary design results, examining the evolution of beam phase space at different grid positions. An optimization method for reducing the emittance of a gridded thermionic-cathode electron gun is proposed through theoretical derivation, electromagnetic-field simulation, and beam-dynamics simulation. A 50% reduction in emittance was achieved for a 50&#xa0;keV, 1.7&#xa0;A electron gun, laying the foundation for the subsequent design of a high-current, low-emittance injector.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Emittance optimization of gridded thermionic-cathode electron gun for high-quality beam injectors

  • 期刊论文

  • 发表日期：

    2025年12月9日

查看全文
  • Xiao-Yu Peng,
  • Hao Hu,
  • Tong-Ning Hu,
  • Jian Pang,
  • Jian-Jun Deng,
  • Guang-Yao Feng

摘要

Electron beam injectors are pivotal components of large-scale scientific instruments, such as synchrotron radiation sources, free-electron lasers, and electron-positron colliders. The quality of the electron beam produced by the injector critically influences the performance of the entire accelerator-based scientific research apparatus. The injectors of such facilities usually use photocathode and thermionic-cathode electron guns. Although the photocathode injector can produce electron beams of excellent quality, its associated laser system is massive and intricate. The thermionic-cathode electron gun, especially the gridded electron gun injector, has a simple structure capable of generating numerous electron beams. However, its emittance is typically high. In this study, methods to reduce beam emittance are explored through a comprehensive analysis of various grid structures and preliminary design results, examining the evolution of beam phase space at different grid positions. An optimization method for reducing the emittance of a gridded thermionic-cathode electron gun is proposed through theoretical derivation, electromagnetic-field simulation, and beam-dynamics simulation. A 50% reduction in emittance was achieved for a 50 keV, 1.7 A electron gun, laying the foundation for the subsequent design of a high-current, low-emittance injector.