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<p>This article presents the design and development of a compact floating high-voltage (HV) sub-microsecond pulse generator (SMPG) based on a wide-bandgap switch and high-insulation high-gain pulse transformer for electron beam generation using an electron-emitting surface load. Typically, pulse generators use multiple switching devices for fixed reference pulse generation, which encounter synchronisation issues, higher switching losses, and parasitic effects that deteriorate the output pulse characteristics, like rise/fall time and jitter. The developed SMPG generates HV sub-microsecond pulses with a floating reference and mitigates the issues through a voltage doubler circuit, a single SiC MOSFET-based pulse-forming stage, and a high-gain, highly insulated pulse transformer. The pulse transformer has been designed with a leakage minimization and parasitic reduction approach to boost the pulse voltage without any tailing effect on the pulse. The SMPG produced 200 ns duration pulses of -3&#xa0;kV to -6&#xa0;kV voltage for two equivalent electron-emitting surface loads. The analysis of the output pulse’s dynamic profile and pulse’s jitter has been performed for a minimum of five times with both types of loads for the full voltage range. The negative high-voltage pulse generated by the SMPG up to a -15&#xa0;kV floating reference has been experimentally tested with a Pseudospark-based electron beam source, and it successfully enabled electron beam current generation.</p>

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Investigation of solid-state-based floating sub-microsecond pulse generator for electron beam source

  • 期刊论文

  • 发表日期：

    2025年10月14日

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  • Aashish Ranjan,
  • Anand Abhishek

摘要

This article presents the design and development of a compact floating high-voltage (HV) sub-microsecond pulse generator (SMPG) based on a wide-bandgap switch and high-insulation high-gain pulse transformer for electron beam generation using an electron-emitting surface load. Typically, pulse generators use multiple switching devices for fixed reference pulse generation, which encounter synchronisation issues, higher switching losses, and parasitic effects that deteriorate the output pulse characteristics, like rise/fall time and jitter. The developed SMPG generates HV sub-microsecond pulses with a floating reference and mitigates the issues through a voltage doubler circuit, a single SiC MOSFET-based pulse-forming stage, and a high-gain, highly insulated pulse transformer. The pulse transformer has been designed with a leakage minimization and parasitic reduction approach to boost the pulse voltage without any tailing effect on the pulse. The SMPG produced 200 ns duration pulses of -3 kV to -6 kV voltage for two equivalent electron-emitting surface loads. The analysis of the output pulse’s dynamic profile and pulse’s jitter has been performed for a minimum of five times with both types of loads for the full voltage range. The negative high-voltage pulse generated by the SMPG up to a -15 kV floating reference has been experimentally tested with a Pseudospark-based electron beam source, and it successfully enabled electron beam current generation.