Three-dimensional numerical simulation of the single-channel pulsed-power vacuum device

Based on the 3-dimensional Particle-In-Cell (PIC) code CHIPIC3D, with a new circuit boundary algorithm we developed, a conical magnetically insulated transmission line (MITL) with a 1.0-MV linear transformer driver (LTD) is explored numerically. The values of switch jitter time of LTD are critical parameters for the system, which are difficult to be measured experimentally. In this paper, these values are obtained by comparing the PIC results with experimental data of large diode-gap MITL. By decreasing the diode gap, we find that all PIC results agree well with experimental data only if MITL works on self-limited flow no matter how large the diode gap is. However, when the diode gap decreases to a threshold, the self-limited flow would transfer to a load-limited flow. In this situation, PIC results no longer agree with experimental data anymore due to the anode plasma expansion in the diode load. This disagreement is used to estimate the plasma expansion speed.

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PIC simulation of the anode plasma in a high-power hollow cathode diode

Liu

Zou²,

Wang

et al. 2018

Physics of Plasmas

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In this paper, the evolution and dynamics of anode plasmas in high-power hollow cathode diodes were studied by particle-in-cell (PIC) simulation. The simulation results show that the ion flow emitted by the anode plasma layer and the increase of the electron current caused by the ion flow will cause a significant decline in the diode impedance in a short time. In addition, the expansion of the anode plasma layer will cause the diode impedance to decrease. The PIC simulation technique is also applied to a high-power hollow cathode diode of a 1.0 MV-LTD generator for anode plasmas, and the PIC simulation results were compared with the experimental data.

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Three-dimensional numerical simulation of the single-channel pulsed-power vacuum device

Cited by 4 publications

References 7 publications

Enhancement of the electric field threshold for microwave breakdown by crossed magnetic field

Enhancement of the electric field threshold for microwave breakdown by crossed magnetic field

PIC simulations of conical magnetically insulated transmission line with LTD generator: Transition from self-limited to load-limited flow

PIC simulation of the anode plasma in a high-power hollow cathode diode

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