Work

Time delay statistics modeling of megavolt self-triggered pre-ionized switch under nanosecond pulses

Year: 2024

Type: article

Abstract: This paper establishes and validates a semi-quantitative calculation model for the breakdown time delay and jitter of a megavolt self-triggered pre-ionized switch under nanosecond pulses. The calculated error for the time delay ranges from 0.6% to 12.6%, and the observed variation trend in jitter is deemed reliable. The influence mechanisms of the breakdown time delay and jitter, as predicted by the model, align with experimental results. Notably, a jitter offset effect is identified in the pulsed breakdown process due to the time-varying electric field. The study predicts and confirms that the optimal breakdown time for the trigger gap under pulsed pre-ionization mode is ∼70% of the peak time of the input pulse and the gradient resistor should not exceed 4 kΩ under continuous pre-ionization mode to maintain the intensity of the switch leak current. This model is an extension of the Donaldson model, including the pre-ionization source with an inherent jitter and the formative time delay under nanosecond pulses. This framework may serve as a reference for analyzing time jitter statistics of other megavolt pulsed gas switches.

Source: Physics of Plasmas

DOI: 10.1063/5.0222204

Authors: Tianchi Wang, Wei Chen, Yingchao Du

Institutions: Northwest Institute of Nuclear Technology, Tsinghua University

Language: English

Topic: Pulsed Power Technology Applications

Subfield: Control and Systems Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Funder: National Natural Science Foundation of China

Award: G5152264571