Speaking of super cooled, the focusing magnets for the Superconducting Super Collider Ion beam were designed for 4^K. Design called for a Cryo unit every 5 miles of the 52 mile circumference. Thank Sam Donaldson, 60 minutes for crashing that. Cern in Switzerland did the same thing on a smaller scale and lots less money. He saved the taxpayer $200M per year in operating expenses alone, not including the cost of construction. Purpose was to prove the equations of the international scientists there about their Top Quarks and such when collided at the speed of light....big train wreck.