Tank Capacitor:

I have 10 Maxwell 30 nF, 35 kV pulse capacitors. I currently use 2 strings of 3 for 45 nF at 70kV.

I have 100 Seacor metallized polypropylene high pulse capacitors, 47nF, 1,600 VDC, 550 VAC, Maximum Pulse Rise Time (dv/dt) 4,000 V/uSec.
I can use up to 7 strings of 14, for a total of capacitance of 23.5nF. I use a 10 MegOhm 1/2 watt bleed resistor across each capacitor.

Controller PSU Cap Gap Primary
Secondary Topload Design (.doc) Disasters BigAss Coil