Superconductors for Fusion

Point out news stories, on the net or in mainstream media, related to polywell fusion.

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jcoady
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Superconductors for Fusion

Postby jcoady » Mon Sep 29, 2014 7:13 pm

There is an upcoming talk about Superconductors for Fusion this wednesday at PPPL according to their events calendar.

http://www.pppl.gov/events/calendar

You can watch these talks live using this website.

https://mediacentral.princeton.edu/id/1_rqmmkznx

They had some other fusion related talks this month but they don't seem to have been recorded or they haven't yet posted the video. They had a talk earlier this month by Tri Alpha Energy which you could have watched live but they leave it up to the presenter to decide weather or not they want the talk recorded. A lot of the fusion related talks are not recorded and you can only watch them live.

jcoady
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Re: Superconductors for Fusion

Postby jcoady » Mon Sep 29, 2014 7:24 pm

The videos for the two previous talks this month are now available for viewing.

http://www.pppl.gov/events/colloquium-m ... c-2-device

http://www.pppl.gov/events/colloquium-e ... uring-pppl

crowberry
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Re: Superconductors for Fusion

Postby crowberry » Tue Sep 30, 2014 3:34 pm

Thanks jcoady! The Tri Alpha Energy talk by M. Tuszewski looks very interesting. I have not yet watched it except for the beginning. The contents of the talk is this:

C-2 device
FRC formation
FRC equilibrium
Rotational stability
Tilt stability
FRC confinement
C-2U device
Summary

The length of the talk is 1 h 11 min 40 s.

GIThruster
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Re: Superconductors for Fusion

Postby GIThruster » Tue Sep 30, 2014 3:40 pm

IIRC, the National High Magnetic Field lab down at FL State is working with Superpower Inc for some years now, using the latter's 2nd generation high temperature superconductor tape. The stuff has a nice tight bend radius (one of the most important breakthroughs so far as use in windings) and carries fantastical amounts of current. Single turn windings with 4,000+ amps and almost 20T fields generated. The size and shape of mobile power generators like what is used aboard ships and the size of electric motors are both going to shrink fantastically. And especially when you have a motive application, this is a big deal.
"Courage is not just a virtue, but the form of every virtue at the testing point." C. S. Lewis

D Tibbets
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Re: Superconductors for Fusion

Postby D Tibbets » Tue Sep 30, 2014 10:39 pm

To error is human... and I'm very human.

GIThruster
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Re: Superconductors for Fusion

Postby GIThruster » Tue Sep 30, 2014 11:07 pm

Well you made me go and look it up! And you're right. The thing I was almost recalling from a couple years ago was 4100 amps carried in 20T of background field:

"The cable that carried a world record current of 4100 amperes in a background field of 19.81 tesla."

http://www.superpower-inc.com/system/fi ... bleArt.pdf

It's less than a page long but with pretty pictures and colors.
"Courage is not just a virtue, but the form of every virtue at the testing point." C. S. Lewis

D Tibbets
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Re: Superconductors for Fusion

Postby D Tibbets » Fri Oct 03, 2014 12:44 am

That makes more sense. My limited understanding is that superconductors exclude the magnetic field generated by the current in the wire/ ribbon and that this buildup of magnetic field strength on the ribbon surface plays a role in the maximum current carrying capacity. Having a global background magnetic field surrounding the wire might cause similar or even magnified limitations. This seems to show that in this instance it is not a show stopper up to ~ 20 Tesla at least. I presume this has been tested repeatedly with cold superconductors as they have been used practically at such total magnetic field strengths in multiple applications. It is a valuable indication that at least one high temperature superconductor can also function in this external magnetic field strength environment.

Dan Tibbets
To error is human... and I'm very human.

jcoady
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Re: Superconductors for Fusion

Postby jcoady » Mon Oct 27, 2014 5:34 pm

Here is another talk with video link from MIT Professor about Superconductors for fusion.

http://www.pppl.gov/events/colloquium-l ... plications

jcoady
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Re: Superconductors for Fusion

Postby jcoady » Thu Nov 13, 2014 5:20 pm

The latest talk with video is now available. MIT professor talking about his students work on a fusion reactor design.

http://www.pppl.gov/events/colloquium-s ... evelopment

prestonbarrows
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Re: Superconductors for Fusion

Postby prestonbarrows » Fri Nov 14, 2014 4:09 am


GIThruster
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Re: Superconductors for Fusion

Postby GIThruster » Sat Nov 29, 2014 4:02 pm

"Courage is not just a virtue, but the form of every virtue at the testing point." C. S. Lewis

prestonbarrows
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Re: Superconductors for Fusion

Postby prestonbarrows » Sat Nov 29, 2014 8:50 pm

I know supercritical CO2 is being looked at for closed loop exchangers in the fission reactor world. I have never heard of it being used for magnets though, interesting thought.

A 5-minute look at wikipedia puts the minimum of the phase at around 1000 PSI at 90 F. This is just about the limit of standard copper tubing, so it is at least in the ballpark of feasibility. I have no idea what, if any, gains could be gotten over water in terms of heat rejection through small pipes or if it would justify the significantly added complexity. In general, you would like colder temps to reduce the wire's resistivity, but the critical point for CO2 is not all that high.

GIThruster
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Re: Superconductors for Fusion

Postby GIThruster » Mon Dec 01, 2014 4:36 pm

I mention it just because you noted the thermal transport is limited by the water flow through the system, and that is characterized by fluid turbulence. Supercritical CO2 has a higher power density that water, and it flows like a gas rather than a liquid, but has the density of a liquid; so it is a remarkable solution in many ways. Much smaller footprint than water/steam. I'm not sure copper tubing is the way to go. It's possible this could be 3D printed and formed into a block of aluminum. That would be very strong and easy to keep cool. The trouble is you need to be able to print with 6 different materials at a time and this is what 3D printing is not good at yet.
"Courage is not just a virtue, but the form of every virtue at the testing point." C. S. Lewis

D Tibbets
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Re: Superconductors for Fusion

Postby D Tibbets » Mon Dec 01, 2014 5:41 pm

Then there are other stratagies like Bitter magnets...

http://en.wikipedia.org/wiki/Bitter_electromagnet

Dan Tibbets
To error is human... and I'm very human.


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