Plasma blasting with coaxial electrodes

A discharge breaking system having a structure wherein ends of a plurality of electrodes are connected to each other through a thin metal wire, a capacitor is connected to the other ends of said electrodes and said thin metal wire is submerged in a breaking substance for transmitting a pressure;

• and configured to break an object to be ruptured with an expansion force generated by fusing-vaporization of said thin metal wire and abrupt vaporization of said breaking substance which are caused by supplying or discharging electric energy preliminarily charged or accumulated in said capacitor to said thin metal wire through said electrodes in a short time, characterized in that an inner metal core and an outer metal core of a coaxial cable composed of said inner metal core and said outer metal core which are coaxially disposed and covered with a sheath member are used as said electrodes, an end portion of said sheath member is cut off to expose ends of said inner core and said outer core, the exposed ends of said inner core and said outer core are submerged in said breaking substance, and the exposed end of said inner core has a portion of smaller cross section than the remainder of said inner metal core and is connected to the exposed end of said outer core so that the exposed end of said inner core serves as said thin metal wire.