Superconducting magnetic shielding apparatus and method

Patent · Sat Jan 01 00:00:00 EST 1983

OSTI ID:864733

Clem, John R ^[1]; Clem, John R ^[1]

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1. Ames, IA

Disclosed is a method and apparatus for providing magnetic shielding around a working volume. The apparatus includes a hollow elongated superconducting shell or cylinder having an elongated low magnetic pinning central portion, and two high magnetic pinning end regions. Transition portions of varying magnetic pinning properties are interposed between the central and end portions. The apparatus further includes a solenoid substantially coextensive with and overlying the superconducting cylinder, so as to be magnetically coupled therewith. The method includes the steps passing a longitudinally directed current through the superconducting cylinder so as to depin magnetic reservoirs trapped in the cylinder. Next, a circumferentially directed current is passed through the cylinder, while a longitudinally directed current is maintained. Depinned magnetic reservoirs are moved to the end portions of the cylinder, where they are trapped.

• Research Organization: Ames Laboratory (AMES), Ames, IA; Iowa State Univ., Ames, IA (United States)
• DOE Contract Number: W-7405-ENG-82
• Assignee: Clem, John R. (Ames, IA);Clem, John R. (Ames, IA)
• Patent Number(s): US 4409579
• OSTI ID: 864733
• Country of Publication: United States
• Language: English

Related Subjects

superconducting
magnetic
shielding
apparatus
method
disclosed
providing
volume
hollow
elongated
shell
cylinder
pinning
central
portion
regions
transition
portions
varying
properties
interposed
solenoid
substantially
coextensive
overlying
magnetically
coupled
therewith
steps
passing
longitudinally
directed
current
depin
reservoirs
trapped
circumferentially
passed
maintained
depinned
moved
hollow elongated
superconducting magnet
central portion
superconducting magnetic
magnetically coupled
providing magnetic
shielding apparatus
magnetic shielding
transition portion
magnetic shield
coupled therewith
/335/174/505/