In message <[EMAIL PROTECTED]>, Brian Kirby writes:
>A cryo may be hard to put togather (and maintain - from experience)
>but there are plenty of peltier junctions/devices out there...
You need LHe for superconductivity and a cryo is damn hard to put
together, if you don't want to spend a lot of money buying LHe.
This is the size of cryo used by the metro labs:
http://www.ipht-jena.de/photonische-instrumentierung/abteilungen/quantendetektion/anwendungen/voltage-standard.html
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