Help with QCW drsstc

Pac85hv, Sun Jul 30 2017, 08:54PM

I would like to build a medium sized qcw drsstc featuring a double full bridge of IRGP60B60PD1 IGBTs.
I was planning on running the coil at a lower peak current than what such a bridge would be able to handle(which should be around 300A) in order to be able to run the coil at an an higher bps.
I should be able to build the drsstc without many problems, the only thing I was doubtful about is the tank capacitor. I know mica capacitor are the best for this application but I would like to start with a cheaper solution(and maybe upgrade in the future). I was planning on using an mmc of 1.6kv 10nf capacitors(KEMET R76TI21004040J) arranged in 5 parallel strings of 10 series caps for a total of 16kv 10nF, is that going to handle the current?
Regarding the bus modulator, that is what is confusing me the most. I know zrghv uses two IRGP60B60PD1 in parallel as the buck switch and I was planning on doing the same but I would like the opinion someone which as enough experience: how much current would they be able to handle in an hard switched application like this one? Since I have a lot of rurg5060 diodes I was planning on using some of those in parallel in the buck. The hardest thing for me is to find a suitable core for the output filter, using a lot of E shaped cores seems like an expensive option so I would rather use a powdered iron core.
I'm ordering everything from a website where the biggest core they have is called FS-1RIN-225B-00 with an AL of 98nH and an Ae of 142.0 mm². The datasheet doesn't seem to talk about the maximum flux density that the core can handle but I calculated the flux density to be around 6 tesla(considering 35 turns for 120uH and an operating frequency of around 15khz at 300v) and I don't think it would be able to handle it.Can someone suggest me a good core than is available where I live(Italy)?
That is all for now, thanks in advance.