Actually the stored energy goes up as the square of the potential (voltage),
so doubling the voltage will multiply the capacitor's stored energy
by a factor of 4, not 2.
As you pointed out this is a strong reason to use voltage doubler circuits,
especially with solid state switched Tesla oscillators.
Happy New Year to all on the Tesla List.
In Tucson, we are firing off a medium size coil at precisely midnight (in a
bar). Hopefully we will not have our own "falling sphere"A 500 kV New
Year's Eve Party!
Dr. Resonance