RE: Thorated vs Pure Tungsten
Hi BIll, all,
> Original Poster: wysock-at-ttr-dot-com
> To Terry (specifically) and All,
> Please reconsider your design for a "safety gap." I worte to you
> before, about using either brass or copper sphere electrodes,
> for this purpose. They can either be solid machined pieces, or
> hollow-spun units. The solid pieces are needed where you are
> operating at a.c. input levels above about 5 Kva. The "ball gap"
> offers a very well defined E-field stress line model, between the
> two electrodes, assuming that they are polished and very smooth
> and of a constant radius of curvature.
A useful and simple substitute for a ball gap (which I also like) is
to use two pieces of pipe set at right angles to each other. It's
bulkier and perhaps more hassle to mount but approximates a spherical
gap rather well for a very low cost. The pipe ends need to be well
insulated to avoid corona leakage.