Magnetic field generator
AssigneeHitachi, Ltd.
InventorsHisashi Isogami, Norihide Saho, Hiroyuki Tanaka
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Abstract
A magnetic field generator comprises a superconducting bulk body, which generates a superconducting magnetic field, a refrigerant vessel for storing solid nitrogen, a vacuum container, which accommodates therein the superconducting bulk body and the refrigerant vessel, and a refrigerator having a cooling head for cooling the refrigerant vessel. The superconducting bulk body is arranged along a wall of the vacuum container. The cooling head of the refrigerator and the refrigerant vessel are in thermal contact with each other. The refrigerant vessel and the superconducting bulk body are in thermal contact with each other.
Claims25
A magnetic field generator comprising:
- a superconductor, which generates a superconducting magnetic field;
- a refrigerant vessel for storing a solid nitrogen;
- a vacuum container, which accommodates therein the high-temperature superconductor and the refrigerant vessel;
- and a refrigerator having a cooling head for cooling the refrigerant vessel, and
- wherein the superconductor is arranged along a wall of the vacuum container, the cooling head of the refrigerator and the refrigerant vessel are in thermal contact with each other, and the refrigerant vessel and the superconductor are in thermal contact with each other.
A method of polarizing a magnetic field generator comprising a superconducting bulk body, which generates a superconducting magnetic field, a refrigerant vessel for storing a solid nitrogen, a vacuum container, which accommodates therein the superconducting bulk body and the refrigerant vessel, and a refrigerator having a cooling head for cooling the refrigerant vessel, the method comprising:
- generating a polarizing magnetic field so that the superconducting bulk body is arranged centrally of the magnetic field;
- pouring liquid nitrogen into the refrigerant vessel;
- operating the refrigerator to thereby change the liquid nitrogen into solid nitrogen;
- and
- demagnetizing the polarizing magnetic field to have the superconducting bulk body holding a magnetic intensity when temperature of the superconducting bulk body becomes equal to or lower than a critical temperature.
A magnetic field generator comprising:
- a refrigerator having a cooling head;
- a refrigerant vessel for storing a refrigerant, which is in thermal contact with the cooling head;
- a superconducting bulk body for generating a superconducting magnetic field, which is in thermal contact with the refrigerant vessel;
- a vacuum container, which accommodates therein the superconducting bulk body and the refrigerant vessel, and having a first surface and a second surface, a distance between the first surface and the second surface being variable;
- a heat insulating material arranged between the superconducting bulk body and the second surface;
- and
- a position regulator for varying a distance between the superconducting bulk body and the second surface of the vacuum container.
Dependencies are inferred from the claim text.