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.

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10 responses

10 12 2009
alexjrgreen

Single connecting nubs at the closest point between the coils, extending below the midline of the magrid, are going to get very hot.

Better to use two nubs spaced apart and/or route them above the midline.

10 12 2009
FAMULUS

I’m ignoring nub design on this iteration.

Can you send a drawing of “two nubs spaced apart”. not sure what you mean.

10 12 2009
alexjrgreen

Imagine an edge between two corners of the cube. Instead of dividing it into two with one nub, divide it into three with two nubs.

10 12 2009
ike

btw, have you ever considered bending pipes and welding them together?

10 12 2009
ike

i figure you could just pour insulator into them while straight, bore a hole through that afterwards and then bend them into shape while applying heat (assuming the insulator is a thermoplastic)

10 12 2009
ike

uha. checking wikipedia on pipe bending yielded this: http://www.ttb.com/process.htm

11 12 2009
Schrödinger

Pipe bending definitely works to make a MaGrid shape. I’m working on one now, but ran out of money for more gas welding fuel. I’m also a bit chicken when it comes to using the oxy-mapp torch. I’m completely new to it and welding in general. I should have more of the grid finished in a couple weeks. Once finished it will be a while before I have enough equipment to even power it up.

13 12 2009
FAMULUS

Congrats on getting hitched!

22 12 2009
Dustin

I have some serious doubts that it will withstand the voltage especially after welding.
Why dont you try powering the coil with a car battery and letting it float at the grid voltage?

24 12 2009
FAMULUS

That might be a good place to start.

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