Production of low-energy, high-current electron beams in a gun with a controlled explosive emission cathode

Kiziridi, P. P.; Ozur, G. E.

doi:10.1016/j.vacuum.2021.110560

Cited by 8 publications

(1 citation statement)

References 13 publications

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“…According to Refs. [22,38], under vacuum conditions, the impedance of the diode is 60 Ω when it is stable, and the entire device is in the impedance matching state. However, upon the introduction of argon gas, the impedance decreases with the increasing gas pressure due to electron collisions with argon atoms, thereby impacting the quality of the electron beam and resulting in a reduction in voltage, as gas infusion continues, the collision-generated charged particles increase, leading to an augmentation in the measured current, ultimately resulting in a decrease in impedance as the gas pressure increases.…”

Section: Figurementioning

confidence: 99%

Research on the influence of gas ionization on pulse forming in linear transformer driver (LTD) electron beam generator

Li,

Liu,

Xiang

et al. 2024

Front. Phys.

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Currently, there is limited research on the influence of gas ionization on the pulse formation process in pulse power source-driven loads. This paper introduces a road-field-Particle-In-Cell (PIC)/Monte Carlo Collision (MCC) collaborative simulation method that can accurately simulate gas ionization in Linear Transformer Driver (LTD) electron beam generation (EBG). The method couples the electromagnetic field and charged particle simulated through PIC/MCC with the circuit modules, and the load's voltammetry characteristics can real-time feedback to the Blumlein Pulse Forming Network (BPFN) of the LTD. In contrast to prior simulations that used fitted ideal T-shaped pulse input waveforms to model the load, this method provides a clearer depiction of the influence of gas ionization on the pulse shape. Additionally, the paper conducts simulation studies on LTD electron beam generator operating at different argon gas pressures. The findings indicate that introducing gas can effectively increase current while reducing voltage amplitude, thereby lowering the diode impedance. A small amount of gas can slightly enhance peak power, but excessive gas diminishes peak power and significantly shortens voltage pulse width. This is attributed to the beneficial effect of a small amount of gas ionization-produced plasma on the device. However, an excessive amount of gas ionization-generated plasma can lead to impedance mismatch in the device, even resulting in a load short circuit. This phenomenon causes a decrease in pressure drop at the top, consequently shortening the pulse width.

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Section: Figurementioning

confidence: 99%