ELECTRICAL FEEDTHRUS

1. ELECTRICAL FEEDTHRUS • Choice of feedthrus impacts possible circuits and also number of ports • BNC: 1. Grounded Shield (500 VDC max) • Single-Ended, 1-4 BNC/FT (preferred, w/4) • Double-Ended, 1-2 BNC/FT 2. Floating Shield (2500 VDC max) • Single-Ended, 1 BNC/FT • Double-Ended, 1 BNC/FT • SHV: 1. Grounded Shield (5000 VDC max) • Single-Ended, 1-4 SHV/FT (preferred, w/2 – if needed?) • For RTD: 1. Type-D Subminiature (300 VDC max) • 9-50 pins/FT (preferred, w/9 pins – flexible uses) 2. TC Mini-Thermocouple (<1 VDC max) • 1-5 pairs/FT 3. MS Thermocouple (<1 VDC max) • 2-20 pins/FT, use crimps in vacuum Single-Ended BNC Bayonnet End (Grounded Shield) (Floating Shield) * weldable versions are also available Double-Ended BNC Type-D TC MS R. Mountain, Syracuse University VACUUM Scrapbook 2006 -1-

2. IN-VACUUM CABLES • In-Vacuum Cables • Outgassing issue w “normal” coax • In-vacuum BNC is not “usual” BNC • Own-make or Purchase ? • In-Air Cables • Can use “normal” BNC connectors • Make Triax-to-Coax conversion in air BNC coax (Floating Shield) KAP5 coax (Grounded Shield) Push-On Kapton-insulated Lead wire KAP1 use w. single-strand KAP1, mates w. Bayonnet Kapton-insulated Stranded coax KAP5 R. Mountain, Syracuse University VACUUM Scrapbook 2006 -2-