Fusion Message Board

In this space, visitors are invited to post any comments, questions, or skeptical observations about Philo T. Farnsworth's contributions to the field of Nuclear Fusion research.

Subject: Re: various instrumentation and parts questions
Date: Jul 06, 08:01 am
Poster: Pierce Nichols

On Jul 06, 08:01 am, Pierce Nichols wrote:

>Virtually all sparkplugs are "rated" for the same voltage (actually, voltage rating isn't really an issue for spark plug design.. More important is the thermal and wear characteristics.).

Ok, I'm looking to go to 30 kV grid voltage (the x-ray supply I'm looking at can hit 125 kV, but will be limited to 30 kV). Do you know if sparkplugs will handle this kind of voltage?

>You're probably stuck buying (hopefully used or surplus) hermetic coax feedthroughs, which you then typically install in a blank plate by bolting and gasketing (or some suitable adhesive). They are pricey, though....

Don't I know it! I was just looking at the weld lip ones, and suffering some serious sticker shock.

>How good of an impedance match do you need, or are you just concerned about shielding?

Doesn't have to be perfect, but it would be nice if it was known, so I could build a matching network if necessary.

Pierce Nichols