MRI Magnet system with permanently installed power leads

Details MRI Magnet system with permanently installed power leads MRI Magnet system with permanently installed power leads

1987-09-28

1989-06-20

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Superconductive type

174 154, 62 511, H01F 722

Patent

active

048412686

ABSTRACT:
A magnet system, having permanently installed power leads, for providing a magnetic field. The system includes a vacuum vessel and a cryogenic containment vessel supported within the vacuum vessel. The containment vessel holds a main coil formed of superconductive wire, along with a quantity of liquid helium to maintain the wire below its critical temperature. The power leads, which supply energy to the coil from a power supply outside the vacuum vessel, also take energy from the coil to a load resistor outside the vacuum vessel when the coil is discharged, each include an elongate metallic tube. The magnet system also includes a solenoid controlled valve which is responsive to the passage of electric current through the tubes of the power leads to cause helium gas resulting from the boiling of liquid helium in the containment vessel to be vented to atmosphere through the tube thereby cooling them.

REFERENCES:
patent: 4544979 (1985-10-01), Ennis et al.
patent: 4625193 (1986-11-01), Purcell
patent: 4635450 (1987-01-01), Laskaris
patent: 4655045 (1987-04-01), Matsumoto et al.
patent: 4689439 (1987-08-01), Sato
patent: 4689707 (1987-08-01), Schwall
patent: 4695675 (1987-09-01), Yamamoto

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