Patent ID: 8283816

Claim:
A vacuum container for housing therein a superconducting apparatus, comprising: first and second partition walls made of magnetic-permeable nonmetallic materials, respectively, and facing each other to form a vacuum heat insulation chamber that is adapted to cover a superconductor that generates a magnetic flux, the first and second partition walls being exposed to relatively higher and lower temperatures, respectively, the first partition wall including a radiation surface emitting thermal radiation, the second partition wall including an absorption surface absorbing the thermal radiation, wherein one of the radiation surface of the first partition wall and the absorption surface of the second partition wall is provided with a metal layer group in an exposed manner relative to the other of the radiation surface of the first partition wall and the absorption surface of the second partition wall, and the metal layer group includes a plurality of metal layers spaced apart from one another and the nonmetallic material appears between the plurality of metal layers.