Experimental Small Induction Machines
  Levitating and Non Levitating Rotors                
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Non  Magnetic Conductors

There are many ways to consider non magnetic conductors which may be suitable for these experimental machines. The most important may be the actual metal. Copper is more conductive than Aluminum, but Al is far lighter than Cu, and weight may be an important factor.
Al is my choice based on cost alone. There may be an infinite number of possible non magnetic metals and alloys to test.

Solid conductors would appear to be best, but I have seen info on the Inductrac Train where trials have been done with a ladder like Al rail system. The Graviflyer uses just a thin stucco or textured Al plate.