Plasma armature formation manner and device null of electromagnetic launcher die electromagnetic

摘要

PURPOSE:To form a plasma armature easily with good reproducibility by a method wherein line explosion plasma is blown into an accelerating hole through a fine hole and arc discharge is generated to form the plasma armature by a plasma forming material at a specified place. CONSTITUTION:A total current is conducted at first through a line explosion circuit simultaneously with the starting of electric discharge while plasma, generated by line explosion, is blown into an accelerating hole 2 through a fine hole 11. This phenomenon can be confirmed from the initial small peak of a signal from an optical probe provided near the small hole. When the value of current has arrived at about 20 KA after about 10 mus, new arc discharge is generated at a place whereat the fine hole 11 between rail electrodes 1, 1 is located and the current of the line explosion circuit is attenuated suddenly simultaneously with the generation of the arc discharge whereby the total current is shifted to an arc discharge current quickly. An arc discharge plasma 13 becomes a plasma armature moving with a speed of about 2.5-3.0 Km/s which can be understood from the optical probe signals of respective positions.