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In my final design I used a 1200v MOSFET. I used the IGBT as well and they both perform similarly. The bias might have to be changed slightly. The best way is to just build it and turn the parabola amplitude up and you should reach close to 800v p-p without clipping.
The edge convergence is the problem. Best to start with a symmetrical parabola and only vary the amplitude at first. All the convergence controls interact and I had to patiently circle over and over all the convergence adjustments to get best convergence. But edge convergence pretty good now.
Had a set back tonight as a second metal film replacement cap appears to have failed. Earlier the 0.001ufd cap across the vertical output primary failed. It was a 1600v unit. I replaced it with a 2000v cap and after working for a couple of days I have a compressed distorted scan. Will have to figure that one out tomorrow.
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