The injected plasma triggered breakdown of the trigatron spark gap

Chen, Li; Yang, Weihong; Fan, Hao; Li, Xinwen; Liu, Ying

doi:10.1063/1.5126506

Cited by 6 publications

(1 citation statement)

References 27 publications

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“…The working mechanism of the plasma generated by the ablation of the trigger cavity is based on the Joule heating effect of the electric arc, so from an image-only point of view, the detailed physicochemical processes of the plasma can be ignored and only equated to the effect of an applied heat source. In this work, we established a numerical model of the finite element flow field and the following assumptions are made for the plasma jet process in combination with experimental conditions as follows [23][24][25][26].…”

Section: Basic Assumptions Of Two-dimensional Flow Field Of Plasma Jetmentioning

confidence: 99%

Numerical simulation and experimental verification of plasma jet development in gas gap switch

Dong

Guo

Zhang

et al. 2023

Plasma Sci. Technol.

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Plasma jet triggered gas gap switch has obvious advantages in fast control switch. The development of the plasma in the ambient medium is the key factor affecting the triggering conduction of the gas switch. However, the plasma jet process and its characteristic parameters are complicated and the existing test methods cannot fully characterize its development laws. In this work, a two-dimensional transient fluid calculation model of the plasma jet process of the gas gap switch is established based on the renormalization-group (RNG) k-ε turbulence equation. The results show that the characteristic parameters and morphological evolution of the plasma jet are basically consistent with the experimental results, which verifies the accuracy of the simulation model calculation. The plasma jet is a long strip with an initial velocity of 1.0 km/s and develops in both axial and radial directions. The jet velocity fluctuates significantly with axial height. As the plasma jet enters the main gap, the pressure inside the trigger cavity drops by 80%, resulting in a rapid drop in the jet velocity. When the plasma jet head interacts with the atmosphere, the two-phase fluid compresses each other, generating a forward-propelled pressure wave. The plasma jet heads flow at high velocity, a negative pressure zone is formed in the middle part of the jet, and the pressure peak decreases gradually with the height. As the value of the inlet pressure increases, the characteristic parameters of the plasma jet increase. The entrainment phenomenon is evident, which leads to an increase in the pressure imbalance of the atmospheric gas medium, leading to significant Coandǎ effect. Compared with air, the characteristic parameters of plasma jet in SF6 are lower, and the morphological evolution is significantly suppressed. The results of this study can provide some insight into the mechanism of action of the switch jet plasma development process.

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Section: Basic Assumptions Of Two-dimensional Flow Field Of Plasma Jetmentioning

confidence: 99%

Numerical simulation and experimental verification of plasma jet development in gas gap switch

Dong

Guo

Zhang

et al. 2023

Plasma Sci. Technol.

View full text Add to dashboard Cite

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Plasma triggered spark gap switch for multiple switch synchronization

Kanchi

Shukla

Sharma

2020

Review of Scientific Instruments

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A four-electrode plasma based triggered spark gap switch is designed for pulsed power applications, which consists of an anode and cathode of a main spark gap switch and an anode and cathode for a trigger pin. The anode and cathode of the trigger pin are coaxially arranged, and the gap between electrodes is 25 μm. A trigger voltage of 200 V is applied across the trigger gap with the help of a switching insulated gate bipolar transistor. With the breakdown of the trigger gap, plasma is generated, which is injected into the main gap. The trigger pin is placed axisymmetric to the main spark gap in the cathode. The main discharge channel of the spark gap has 0.6 mm space between two electrodes, which is charged to 1000 V. When the spark gap is triggered, the discharge current has a peak value of 6.1 kA with a quarter cycle time period of 0.97 µs. The four-electrode spark gap switch results are compared with those of a three-electrode trigatron switch, which has the peak current of 6 kA with 1.01 µs as quarter-cycle time period. Four similar four-electrode spark gap switches are triggered with the same scheme and synchronized within 10 ns as peak values of currents with jitter as less than 5 ns.

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Transient heat thermal load characteristics produced by a three-electrode capillary discharge generator

et al. 2021

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The behavior of the transient heat flux produced by a three-electrode capillary discharge generator working at a repetitive mode is presented in this paper. The radial distribution profiles of plasma temperature, electron density, and thermal load are obtained by the optical emission spectrometry and correction algorithm. Experiments with different capillary diameters and charging voltages are carried out, and the relation between the discharge characteristics and the geometry parameters of the capillary is measured. A maximum transient thermal load of 1.42 GW·m−2 is obtained with 10 Hz, which can meet the thermal load amplitude requirement of Type-I edge localized mode heat flux in the ITER-like Tokamak.

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The injected plasma triggered breakdown of the trigatron spark gap

Cited by 6 publications

References 27 publications

Numerical simulation and experimental verification of plasma jet development in gas gap switch

Numerical simulation and experimental verification of plasma jet development in gas gap switch

Plasma triggered spark gap switch for multiple switch synchronization

Transient heat thermal load characteristics produced by a three-electrode capillary discharge generator

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