枝状PFNによる単極性パルス大電流の発生

抄録

A high voltage and large capacitor bank is commonly used as the pulsed power source because of the easy handling to store energy and to release as a high power pulse. A PFN (Pulse Forming Network) is often used as a pulsed power source for generating a square-wave pulse current. However the current` decay arising from the loss of bank system cannot be neglected for longer pulse in case of inductive load such as coils for generating a magnetic field. Therefore we studied the behavior of PFN bank for inductive loads, and obtained a guide for designing the PFN bank for inductive load. Afterthat, we traced to the origin of current decay and got that the decay was caused mainly by the resistance of PFN coils. Although some conventional methods to compensate decay are estimated, these cannot completely compensate for the decay. Therefore we researched a new idea of compensating for the decay through some auxiliary PFN banks connected to the trunk PFN bank (branched PFN system). The obtained current wave form of branched PFN shows that the pulse parameters are well agreed with the calculation and the current decay is effectively compensated. The new system also has a large freedom in controlling the pulse wave form by selecting the number and LC parameters of auxiliary PFNs without' restricting the pulse length.