A pulsed power generator by inductive voltage adder, versatile
inductive voltage adder (VIVA-I), which features a high average potential
gradient (2.5 MV/m), was designed and is currently in operation,. It
was designed to produce an output pulse of 4 MV/60 ns by adding 2 MV
pulses in two-stages of induction cells, where amorphous cores are
installed. As a pulse forming line, we used a Blumlein line with the
switching reversed, where cores are automatically biased due to the
presence of prepulse. Good reproducibility was obtained even in the
absence of the reset pulse. Within ∼40% of full charge voltage, pulsed
power characteristics of Marx generator, pulse forming line (PFL),
transmission line (TL), and induction cells were tested for three types of
loads; open-circuit, dummy load of liquid (CuSO4) resistor, and
electron beam diode. In the open-circuit test, ∼2.0 MV of output
voltage was obtained with good reproducibility. Dependences of output
voltage on diode impedances were evaluated by using various dummy loads,
and the results were found as expected. An electron-beam diode was
operated successfully, and ∼18 kA of beam current was obtained at the
diode voltage of ∼1 MV.
Characteristics of pulsed power generator by versatile inductive
voltage adder