I'm sure many of us here would be very happy to hear any reports of what works - it's what we're all about around this place - not the questions, the answers. What will you be ionizing?
What we found here is that even in my
electrodeless microwave ECR ion source, chemical reduction of the walls (quartz) by deuterium ions was the limiting factor in source lifetime. We found that only pure alumina (very hard to get and handle) and boron nitride are immune from this, but also have lousy microwave characteristics. So we ran with the quartz, thinwall, and accepted that every couple hundred hours, we'd have to replace it, if not sooner. That's something you really don't want to have shatter right next to a turbo pump...kind of an expensive mistake to make.
Posting as just me, not as the forum owner. Everything I say is "in my opinion" and YMMV -- which should go for everyone without saying.