pre65 wrote: ↑
Wed May 09, 2018 2:23 pm
... being extra low ESR helps as well.
It would be a tiny tiny ESR - with all those 50mOhm caps in parallel, you'd end up with an ESR of about 0R00055.
Now THAT IS A LOW ESR !
But it won't really help you at all...
I used just a few similar but HV (500V) RIFAs to build a disk-platter launcher. As the energy stored is proportional to the square of the voltage, having a higher voltage is far more important than having bigger capacitance (in this use case).
One of my projects on this is at http://4hv.org/e107_plugins/forum/forum ... 98629.post
- with just 4 capacitors, I got 2200J with an ESR of 0R015 - enough to vaporise a screwdriver, crush a coke can or fire a 3.5" disk platter so high and fast it punches a hole 30ft up in the ceiling of the warehouse we were in... notice the size of the bussbars I was using and the thickness of the main cables
FWIW, 2F @ 15V is only about 10% of the energy in this thing - I originally designed it for 8 capacitors, i.e. 4,400J - easily enough to seriously injure or kill if it suffered from spontaneous energetic disassembly...
Schematic is linked to in the top post - most of the design is to do with safety interlocks to try to prevent folk being seriously hurt - the trigger switch was on a lead about 15ft long and the unit was kept behind a polycarbonate safety screen.