a discussion forum for Polywell fusion
https://talk-polywell.org/bb/
For high magnetic field operation at cryogenic temperatures near 20 K, the best lightweight conductor presently available is high-purity aluminum, sometimes referred to as a hyperconductor. However, because of its high purity, the material is mechanically weak, and because of its high conductivity the conductor must be fabricated as fine twisted strands to reduce ac eddy current losses. Thus a construction whereby fine filaments are embedded in a high-strength, high-resistivity matrix has been suggested. The ac loss in such a conductor is computed and shown to be similar to that of a multifilamentary superconductor.
Love to see the Jc vs B vs T on that stuff.icarus wrote:Carbon nanotubes eventually? Lots of unknowns but lots more design knobs to twist also.
http://physicsworld.com/cws/article/news/24222
"Physicists in Japan have shown that "entirely end-bonded" multi-walled carbon nanotubes can superconduct at temperatures as high as 12 K, which is 30 times greater than for single-walled carbon nanotubes. The discovery has been made by a team led by Junji Haruyama of Aoyama Gakuin University in Kanagawa."