capacitor bank rapid charging

[magman]

I am currently using 120vac 30amp source through 6 va100 power transformers to raise
voltage to~500vac and bridging to dc in order to charge a capacitor bank of 4000ufelectrolytic
(40x100uf500vdc in parallel) in an experimental project, What I need is more rapid
charging by greater efficiency or increased amperage from the transformer secondaries.
Perhaps some sort of dc/ac invertor system or another method like flyback transformers
or such. I am open for suggestions to achieve bank charging of 50-70mS, thank you