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In this article we present the results of simulation of the initial discharge ignition in electronic equipment of spacecrafts which may appear inside spacecraft electronic equipment on the example of the external lacquer dielectric coating slot-hole defect between conductors. We solved the plasma physics task by COMSOL Multiphysics with a parametric sweep for each potentially vulnerable area in order...
The problem of secondary arcing is actual if spacecraft power equipment operates at voltages of 70 V and higher that exceeds essentially the vacuum arc voltage drop. Such voltages are insufficient to ignite discharge unless the situation when protecting dielectric coating above populated circuit boards contains defects opening triple junction. To find defects and to recognize their parameters, we...
Generation of an anode flare in the initial stage of vacuum discharge was studied. Discharge gap was formed by a liquid-metal gallium-indium point cathode and a flat anode of the same material, with an electrode gap distance of 0.8–1 mm. The discharge was fed by pulse generator with an impedance of 50 Ohm, generating a rectangular pulse with a duration of 200 ns. Estimates show that with a charging...
The paper reports on a study of physical processes occurring in a high-current vacuum arc shunted by semiconductor devices. Dynamics of the current redistribution between the arc discharge in a vacuum circuit breaker (VCB) and an assembly of several semiconductor devices connected in parallel to the VCB is demonstrated.
In the present work, influence of the beginning of the contact opening of the vacuum circuit breaker on the main characteristics of the discharge and the breaking capacity of the breaker is studied. In the experiment, Cu-Cr bulk electrodes with a diameter of twenty millimeters were used. Synthetic circuit generated a half-sinusoidal current with duration of 10 ms and amplitude of 10 kA, followed by...
The problem of breakdowns in equipment of spacecrafts operating on the Earth's orbit is based on multifactor physics involving vacuum electronics, plasma physics, and gas discharge physics. The problem was strongly escalated with increase of operating voltages from 27 V to 100 V followed by even higher voltages in the future. The problem is studied intensively in the course of last ten years, and...
A concept of a hybrid plasma source with a liquid gallium-indium propellant as a thruster for micro-satellites is proposed. Plasma source operates in two regimes: generating the laser ablation plasma and generating the plasma of low voltage vacuum arc discharge with a laser triggering. In the discharge cell of the source, the cathode is a stainless steel capillary tube filled with working liquid....
The paper presents the results on charge and energy ion distribution of heavy species of plasma generated at the anode of vacuum discharge. Liquid metal Ga-In alloy was used both as the cathode and anode material. Using an electrical circuit with a relatively low impedance (∼6 Ohm) and short inter-electrode gap (<1 mm), relatively high current (∼1 kA) was achieved in the discharge at the initial...
Summary form only given. The fast ionization wave (FIW) resulting from nanosecond pulsed discharge at very high overvoltage provides an excellent high reduced electric field (E/N) example discharge due to its spatial uniformity. A comprehensive model of FIW would provide insight into other high E/N discharges used for plasma ignition applications, such as DBD and streamer discharge. To that end the...
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