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In recent years high-speed electromagnetic repulsion mechanism (ERM), which is produced based on the eddy-current effect, has been widely applied to vacuum circuit breakers. One of the challenges for the design of ERM is to improve the speed of ERM by optimization design. In this paper, a novel co-simulation model is proposed. The related electromagnetic field, mechanical field and structural field...
Wire explosion technique has been widely studied in recent years to produce nanoparticles of different materials due to the enormous outstanding characteristics of nanomaterials as well as the advantages of wire explosion technique1. In the wire explosion process for preparation of nanoparticles, the wire firstly melts, vaporizes and then generates a mixture of metal vapor and liquid droplets. The...
Microsecond explosion of metallic wires has drawn attention of many researchers due to its complicated physical process and various applications, such as production of metal nanoparticles1. When a high density pulsed current passes through a thin wire, it quickly melts, vaporizes and ionizes. The medium pressure and charging voltage have significant effect on the development of the generated plasma2...
The impressive experimental result at Sandia National Laboratory has proven the wire-array Z pinch an effective way to form extremely high density X-ray sources. The X-ray yield is greatly influenced by the uniformity of the exploding product of each wire in the initial stage, which gives a strong impetus to the research on single-wire explosion. When the current flows through a thin metal wire in...
The fast electrical explosion of a metal wire is a common method to study the behavior of wires during the prepulse in wire array Z-pinch. The experimental results of the electrical explosion of aluminum (Al) wires using negative nanosecond-pulsed current with magnitude of 1∼2 kA are presented in this paper. The Al wires with different diameter are exploded with current rate of 90–170 A/ns. A laser...
Wire-array Z pinch has been proved to be the most powerful X-ray sources in laboratory with crucial applications in many fields. Much effort has been devoted for better understanding of its physical process via the approaches of numerical simulation as well as experimental investigation. As is well known, the dynamics of plasma is greatly influenced by the magnetic field, hence the numerical calculation...
The fast electrical explosion of a single metal wire has important applications in many fields, e.g., wire-array Z-pinch, x-rays source, and material property in extreme conditions, etc. The experimental and numerical investigations on nanosecond electrical explosion of single thin aluminum wire are presented in this paper. The experiments are conducted under a negative-polarity current with current...
The electrical explosion of single wire is widely used to understand the physics of the early stage of wire-array Z pinch. When the current pulse passes through the thin metallic wire, the wire heats, melts, vaporizes and ionizes. The metallic wire is exploded to two-object structure, the dense cold core surrounded by a conductive corona. Initially, the voltage across and the current through the wire...
Wire electrical explosion (WEE) in vacuum was studied through a 0D model coupled with circuit configuration following the model proposed by Beilis and co-workers. The results were compared with their simulation results. With this model, the influences of some factors including current rise rate and plasma density were analyzed.
The method of magnetic field calculation and its influence on simulating the motion of cathode spots (CSs) in a vacuum arc were investigated in this paper. A method based on coordinate transformation and magnetic field superposition principle was proposed. In this method, the influence of current passing through an electrode rod and a contact plate was taken into account. Comparison was made between...
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