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<p>The basic characteristics of kinematic bunching at the front of a&#xa0;pulsed electron beam are given. A&#xa0;numerical experiment is performed, demonstrating the emergence of space-charge solitons and their sequences in tubular pulsed electron beams injected into the cylindrical drift channels. It is shown that in the cases, where coaxial diodes with magnetic insulation are used as an injector, the solitons predominantly form at a&#xa0;limited cathode emissivity. The velocities of slow and fast solitons are determined, and it is shown that the potential-based approach to describing the fast space-charge solitons is valid in a&#xa0;nonrelativistic case only. A&#xa0;number of examples are given of how the current spikes affect the operation of ultrashort microwave pulse sources.</p>

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Current spikes and space charge solitons in tubular pulsed electron beams: numerical modeling

  • 期刊论文

  • 发表日期：

    2026年1月22日

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  • I. V. Pegel,
  • E. M. Totmeninov,
  • A. A. Grishkov,
  • V. Yu. Konev,
  • O. O. Mutylin

摘要

The basic characteristics of kinematic bunching at the front of a pulsed electron beam are given. A numerical experiment is performed, demonstrating the emergence of space-charge solitons and their sequences in tubular pulsed electron beams injected into the cylindrical drift channels. It is shown that in the cases, where coaxial diodes with magnetic insulation are used as an injector, the solitons predominantly form at a limited cathode emissivity. The velocities of slow and fast solitons are determined, and it is shown that the potential-based approach to describing the fast space-charge solitons is valid in a nonrelativistic case only. A number of examples are given of how the current spikes affect the operation of ultrashort microwave pulse sources.