In-Vacuum Electrical Connectors

This forum is for specialized infomation important to the construction and safe operation of the high voltage electrical supplies and related circuitry needed for fusor operation.
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Nick Peskosky
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In-Vacuum Electrical Connectors

Post by Nick Peskosky » Fri Jul 20, 2018 4:16 pm

Does anyone have a low-cost source for Cu or Cu/Be in-vacuum electrical connectors used for stalks and other feedthrough assemblies? I'm looking for something similar to Cermatec barrel-with-set-screw type connectors, ideally without the megabucks cost? Even vacuum compatible compression or set screw connectors would do the trick.
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Dan Knapp
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Re: In-Vacuum Electrical Connectors

Post by Dan Knapp » Sat Jul 21, 2018 2:10 am

Years ago we made our own connectors for connecting wires and posts on ion sources. We cut pieces of 1/8" OD stainless tubing, drilled and tapped (0-80) a hole about 1/8" from each end, and put in 0-80 x 1/8" pan head screws. We used pan head screws rather than set screws because it was easy to lose the set screws. This was the standard type connector used in those days. You could buy them, but it was cheaper to make them. If you need to connect to larger rods (e.g. feedthrough conductors) you can use 1/4" OD tubing.

ian_krase
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Re: In-Vacuum Electrical Connectors

Post by ian_krase » Sat Jul 21, 2018 11:50 pm

It seems like this is almost always going to be screws and nuts for the low-budget.


Accu-Glass has many options including circular "C-sub" connectors for multi-pin instrumentation and larger pin-and-sleeve connectors. However they are dear.


If you are OK with brass in your chamber, you have many options. My strategy is to buy the appropriate size of Euro-style terminal block strip like this: https://www.allelectronics.com/item/tb- ... ock/1.html and then to carefully cut away all the plastic.

One can then replace the slotted screws with socket-head set screws and have an excellent connector.


Another thing worth considering is the "bullet" or bannana style connectors used for high current connections in the world of R/C cars, planes, and drones. I don't know the exact material -- something copper alloy ish with gold or fake gold plating.

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