Dielectric Test

10 12 2009

I’ve come to a decision on what to build next.

It will be an inexpensive magrid. Not designed to be fully functional, but rather designed to test several immediate concerns:

1) The dielectric varnish between the coils and the magrid chassis. There will be a 30kV+ voltage difference between the coils and their container. The insulating varnish must be evenly applied to the coils. Varnished coils will be stiff and difficult to install. In an attempt to make the coils easier to install, I’m working on an open joint design like this:

2) Test out welding the magrid together. Can we weld this together without destroying the delicate coils inside?

3) Design first iteration of the standoff.

4) Test liquid nitrogen bath.

The machine would have 2 turns of superconducting YBCO and be made using the inexpensive prometal process as before. It will have thick walls to avoid the sagging we got last time.

I’m still working through the details, but this machine should be imminently build-able.





Standoff for Superconducting Magrid

29 08 2009

I’ve been doing some brainstorming on the standoff for the superconducting magrid. This is a messy problem! You need a cryogenic feedthrough that is also a high voltage standoff. Then you need to pass in the YBCO superconducting cables, and wiring for the persistent switch.

Yesterday I realized that we can get most of the way there by welding together two off the shelf components:

standoff_feedthroughThis diagram refrences parts 9812107 and 9611005 from insulatorseal which is a subsidiary of MDC Vacuum. I’ve sent this drawing to insulatorseal for a quote. One problem is that part 9611005 is only rated up to 6kV so we will need a custom variant to get to the 10kV to 40kV range.

The idea with this setup is that the high voltage could come through a standard HV feedthrough and connect to the insulated tip of this feedthrough via a connecting wire:

SC_magrid_feedthrough





Fun with Liquid Nitrogen

16 04 2009

So our dewar checks out. Here is some fun with liquid nitrogen:

Also check out safe handling of liquid nitrogen.








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