SUPERCONDUCTIVE MAGNET DEVICE FOR SINGLE CRYSTAL PULLER

摘要

PROBLEM TO BE SOLVED: To provide a superconductive magnet device that suppresses interference with a puller, improves workability and work safeness in the device and preferably secures a margin of adjusting a magnetic field to apply.

SOLUTION: The superconductive magnet device 10 for a single crystal puller is disposed outside a pulling furnace containing a crucible for melting a single crystal material therein and applies a magnetic field to the melted single crystal material. The device 10 comprises a cryostat 17 containing a superconducting coil therein and a refrigerator port 19 installed on the outer peripheral surface 18 of the cryostat 17 and provided with a cryogenic refrigerator 20 for cooling the superconducting coil. The cryogenic refrigerator 20 is provided in a region of the outer surface region of the cryostat, in which the intensity of the magnetic field generated by the superconducting coil is weak.

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