A powerful capacitor bank was designed and built to investigate the possibility of increasing the neutron yield up to the 1013–1014DD neutrons per pulse and to generate ultrahigh magnetic fields up to 1GG. The bank consists of 60 independent 20 kJ modules. The module contains four 5 kJ, 40 kV capacitors and a gaseous spark gap. Each module is connected to the load by means of four low inductive coaxial cables, each about 11 m long. The inductance of module and output cables is 100 nH. The spark gaps are fired by a generator wich consists of a capacitor, a water pulse‐forming line and an untriggered gaseous spark gap. The bank has a stored energy of 1.2MJ, capacitance of 1.5 mF, inductance of 3 nH, operates at voltages up to 40kV, and providesI ∼ 13 MA, 5 mks risetime current pulse to a 4 nH load.