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Abstract <p>A method and experimental results are presented for the accelerating a magnetized picosecond bunch of runaway electrons in two consecutive atmospheric gaps to which unipolar voltage pulses with amplitudes up to –250 kV and durations of 0.5–1 ns are supplied. The synchronization precision of the pulses is comparable to their leading-edge duration (~100 ps). The gaps are separated by a drift tube whose length is limited by electron energy losses in collisions with gas molecules. If the bunch electrons that have a kinetic energy of ≈250 keV after passing through the first gap and drift tube are accelerated in the second gap at the amplitude voltage, their energy nearly doubles. After both acceleration cycles with intermediate drift, the bunch that has travelled in a strong longitudinal magnetic field a total distance of ≈12 cm maintains the tubular structure imposed by the cathode shape.</p>

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Cascade Acceleration of a Picosecond Runaway Electron Bunch at Atmospheric Pressure

  • 期刊论文

  • 发表日期：

    2026年3月1日

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  • N. M. Zubarev,
  • L. N. Lobanov,
  • G. A. Mesyats,
  • A. G. Sadykova,
  • K. A. Sharypov,
  • V. G. Shpak,
  • S. A. Shunailov,
  • M. I. Yalandin

摘要

Abstract

A method and experimental results are presented for the accelerating a magnetized picosecond bunch of runaway electrons in two consecutive atmospheric gaps to which unipolar voltage pulses with amplitudes up to –250 kV and durations of 0.5–1 ns are supplied. The synchronization precision of the pulses is comparable to their leading-edge duration (~100 ps). The gaps are separated by a drift tube whose length is limited by electron energy losses in collisions with gas molecules. If the bunch electrons that have a kinetic energy of ≈250 keV after passing through the first gap and drift tube are accelerated in the second gap at the amplitude voltage, their energy nearly doubles. After both acceleration cycles with intermediate drift, the bunch that has travelled in a strong longitudinal magnetic field a total distance of ≈12 cm maintains the tubular structure imposed by the cathode shape.