Talk-Polywell.org

http://www.superconductors.org/42C_mod.htm

EDIT: raised Tc in thread title to reflect latest data.

When are we going to see bulk superconductivity at room temperature?

Regarding Eck's work, when the process yield can be vastly improved.

Time to switch from "Lewis & Clark" to "Conestoga Wagon". Tc is good enough, for now.

DeltaV wrote:Time to switch from "Lewis & Clark" to "Conestoga Wagon". Tc is good enough, for now.

Not quite yet. A typical temperature of things in a high desert sun is closer to 200F than 107F. If 200F can be reached then no active cooling would be needed at all (call it 99+% of the time). JMHO.

Process improvement needs to start now. I'm not getting any younger and I want this ready before first hover of my backyard space hopper.

And now he claims 48-50C:

http://www.superconductors.org/48C_44C.htm

scalziand wrote:And now he claims 48-50C:

http://www.superconductors.org/48C_44C.htm

Un freakin real.

QOTD: does anyone think we will be able to comercially exploit this proccess. it seem to hate moisture.

How much does it seem to hate moisture? In some applications a sealed, even vacuum, container would be viable. My question is, to repeat, when will we see any of this in bulk superconductivity?

After patent applications?

These are the ninth and tenth superconductors found to have transition temperatures above room temperature[1].
...
1. Materials 5, 6 and 8 have not yet been published, pending patent application.

He should really focus on yield improvement now. If successful, the money would appear quickly for raising Tc later.

EDIT: raised Tc in thread title.

I would make a wild guess that 'Materials 5, 6 and 8' are being patented because they can be produced with large volume fractions, if not stoichiometrically.

DeltaV wrote: He should really focus on yield improvement now. If successful, the money would appear quickly for raising Tc later.

If the activity on the MT curve is measurement error, or one of the other possible phenomena than superconducting transition, "increasing the critical temperature" is considerably easier than increasing the yield

With a little bit googling you can find discussions, articles of the possible measurement errors, other phenomena responsible for the measurements etc

For example these:

What could be the different mechanisms responsible for diamagnetic transition apart from superconductivity?
http://www.researchgate.net/post/What_c ... nductivity



http://iopscience.iop.org/1009-1963/11/ ... x20412.pdf

Investigation of the positive moments on the M-T curve of a YBCO film measured by using zero-field cooling

The experimental results have shown that there are positive magnetic moment and positive peak on the M-T curve. We have proven that these anomalous behaviours are due to measurement error, but not phase transition.

KitemanSA wrote:

DeltaV wrote:Time to switch from "Lewis & Clark" to "Conestoga Wagon". Tc is good enough, for now.

Not quite yet. A typical temperature of things in a high desert sun is closer to 200F than 107F. If 200F can be reached then no active cooling would be needed at all (call it 99+% of the time). JMHO.

Not so, at least for a Fusion reactor like the Polywell. Even with P-B11 fuel and piratically no neutrons, there will still be megawatts of X-ray Bremmstruhlung radiation, and hot ions and electrons (primarily electrons) hitting the magnet cans through ExB drift losses. If electron cusp losses are around 10-50 MW then ExB losses may be around 0.1 to 5 MW, depending on how you digest the numbers mentioned in the patent application (ExB losses being 1 to 10% of the electron cusp losses). Admittedly there will be no ohmic heating in the superconducting wires, but there will still be significant heating of the magnet cans that will have to be carried away with flowing coolent. Again, depending on the numbers, this incident heat load may be greater than the ohmic heat load in liquid nitrogen cooled copper electromagnets, so cooling requirements may still be as much as 10-50% or more of the heat load of the copper versus superconducting wires.

Dan Tibbets

D Tibbets wrote: of X-ray Bremmstruhlung
Dan Tibbets

Wimper!
Please Dan, it is Bremsstrahlung. BremsstrAhlung.
http://de.wikipedia.org/wiki/Bremsstrahlung
It is the combination of the two German words "bremsen" which means "to slow something down" and the word "Strahlung", which means "radiation".
Sorry buddy, I have sent you a private message about this once or twice, but I cant take it anymore. Your spelling of this word makes me cringe in pain