The requirements for very high currents of short duration is ever increasing particularly in the field of nuclear engineering. These high currents can be obtained by discharge of capacitor banks previously charged with direct current, the capacitor when charged with direct current can store very high energies. The main requirement of these capacitors is a high dielectric strength and the absence of internal inductance. Energy storage capacitors have been used in discharge welding, impulse testing, high intensity flash photography, spectrographs and X-ray photography.