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At the 1 THz frequency band, the cathode substrate size of the traveling wave tube electron gun is only 0.2 mm. The current generated by the thermionic cathode is very small, reaching only 7 mA, resulting in a perveance as low as 10^(-9) pervs. This weak perveance is mainly affected by the thermal initial velocity of electrons. This paper presents the significance of the influence of electron thermal initial velocity in various THz frequency bands. Based on this, a 1THz electron gun was designed. The magnetic system was manufactured using a method of combining multiple magnetic units. Test results were good, achieving 95% of the designed value. The field rise region of the permanent magnet is 14 mm, and the uniform transmission section is 50 mm, suitable for longer interaction circuits.

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Research on the Electron Optical System of 1THz Traveling Wave Tube

  • 会议论文

  • 发表日期：

    2026年

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  • Kangcheng Zhou,
  • Yingzhou Liu,
  • Lin Zhang,
  • Pan Pan,
  • Jinjun Feng

摘要

At the 1 THz frequency band, the cathode substrate size of the traveling wave tube electron gun is only 0.2 mm. The current generated by the thermionic cathode is very small, reaching only 7 mA, resulting in a perveance as low as 10^(-9) pervs. This weak perveance is mainly affected by the thermal initial velocity of electrons. This paper presents the significance of the influence of electron thermal initial velocity in various THz frequency bands. Based on this, a 1THz electron gun was designed. The magnetic system was manufactured using a method of combining multiple magnetic units. Test results were good, achieving 95% of the designed value. The field rise region of the permanent magnet is 14 mm, and the uniform transmission section is 50 mm, suitable for longer interaction circuits.