I have been thinking of the connection between the high voltage feedthrough and inner grid, and using a variation of the "slotted hole and wing nut". (invented for people who can't measure)
I want to silver solder a 0.250" OD collar to the chamber end of the feedthrough electrode. This collar would be threaded with a 6-32 female thread. A 0.250" ID alumina tube will pass over this collar and would be epoxied to the chamber side of the feed through, but extend beyond the collar a few inches. A 6-32 male stud would be silver soldered to the inner grid, and partially covered with a length of 0.156" ID 0.250" OD alumina tube that will telescope into the larger diameter alumina tube as the stud is screwed into the collar. This would allow for some adjustment (essentially the length of the collar) of the inner grid position. The entire connector is covered with alumina and the only epoxy joint would be at the under surface of the feedthrough. The question is will the silver solder hold up to the temps generated at the grid?
Created on Tuesday, May 08, 2001 8:01 PM EDT by Thomas D Dressel