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Cable Asylum Interconnects, speaker wire, power cords. Ask the Cable Guys. |
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Cable Asylum Interconnects, speaker wire, power cords. Ask the Cable Guys. |
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In Reply to: Best conductor in the world ? posted by 2395 on October 12, 2004 at 20:14:09:
They are very easy to use.Get yourself some bisco tape...it is about 30 mils thick, 1/4 inch wide.
Make a sandwiched wire run, using two layers of teflon tape between, and some 10 mil thick g-10 strips on either side...wrap this very tightly using Kapton 1 mil tape slit to 1/4 inch for ease of use, or get some 3/8'th tefzel heatshrink tubing, it remains flexible at cryogenic temperatures. Vacuum impregnation is optional, of course...that depends solely on the lorentz forces...so, no Eminem allowed..
Then, get yourself some liquid nitrogen..it's dirt cheap nowadays, less than 32 cents per quart. This is easily delivered..
The warm to cold transitions will be the most difficult...but the best part is the bisco tape is actually made with a silver tape substrate, so you can easily double it or triple it at the transitions, using the silver itself as the room side of the transition region. Just get some of those heater tapes you use for water pipes to keep the transition from developing a frost ball.
The only problem is, I don't know what the dielectric coefficient of teflon is at 77K....but, you could send the final assembly to me, and I can test that, as well as the quench propagation velocity, and the short sample performance up to about 9 tesla. (don't worry, I'll dead end the v-taps when I'm done..) But I'm afraid the superfluid helium system can't be adapted to pump the LN 2 down sufficiently to give you data at 50 Kelvin through 77K. So, unfortunately, I can only give you room pressure data..If you live in Denver....sorry.)
We have had, of course, good luck in characterizing the bisco tapes by comparison to 4.5 Kelvin measurements, but that is only up to about 7 tesla, and in fields transverse to the conductor..
Don't worry about quenching it, though (I know that was the first thing you were worrying about). The transition to the normal conduction state is very very gradual, and this stuff has a very flat curve up to in excess of 22 tesla background fields (less if it's tangential to the tape of course). So, you can easily expect to find that quench issues below 22 tesla will be avoided as long as you keep the current in the wire to less than about 200 amps.
But please, a word of caution...don't bring your 22 tesla magnets near your speaker wires...I can't guarantee they'll not go critical..
OH, what was I thinking?? Forgot insulation...you can use either 3/8 or 1/2 diameter refrigerator tubing to hold the cables, and you can insulate the tubes using styrofoam, about 2 inch wall thickness. As an added bonus, you won't need those cable lifters anymore, unless you want to use the pipe to hang your laundry..
Cheers, John..
PS...believe it or not, that is how they talk around here...
PPS....don't play with LN 2 ...frostbite is nasty...and it's an ODH hazard.
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Follow Ups
- Why no superconductors??? - jneutron 10/14/0410:41:20 10/14/04 (1)
- An interesting alloy? - jneutron 12:45:22 10/14/04 (0)
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