Learning - I find it hard to stay on topic myself, so I moved this build info from theories and speculations to here where at least it's kinda on topic. Learning to moderate myself...
Whew, finally found all the leaks. A couple very tiny ones were ... not easy. But on consideration, what I want to do will be quite the ship in a bottle issue with a 2.75" cross, so, casting about, it was decided to use Bill's old fusor tank - an 8" CF flange tee, making the necessary adapters and various bench mods along the way. I had at one time another a long tank, 6" with all QF fittings, leaked a little, had some O ring diffusion loss issues, and well, after storing it and stupidly leaving one port open in a storage building... mice... nests, pee and poop - the real killer, even ate some of the stainless.
Now that old 8" CF tee had some issues too, but was stored better, so no mice issues, and with minimal work, might be really good for this, with the pump station under the bench, the pump line extending through the bench to the tee and a nice working setup (I hope).
I took a bunch of pictures while deciding with Bill what to do next, so might as well share - these are compressed a bit because I emailed them in that form, if someone wants real resolution, well, these are 9 megapixels (the lowest setting on the new camera) and kinda large.
The flange with the HV feed thru is one we made way back and O ring sealed as the CF flange was dinged up at 3 and 12 o' clock. Now that I have some more confidence with my tools, I might just try to fix those dings, and put a modifiable real CF blank back on there - these experiments probably won't need extreme volts, and if they do, well, that's not that great a feed thru anyway.
But if I put on my Clickspring hat and make a couple of custom tools....I might get this back to CF and lose a bunch of inches of water vapor-diffusing viton.
Soooo. At the other end of the planet, I have this cute little 60 l/s pump station with a ISO K 63 flange, now to adapt.
To this: