An apparatus using the Faraday effect to locate the magnetic axis of quadrupole magnets

Conference · Fri Jul 01 00:00:00 EDT 1994 · IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States)

OSTI ID:6583097

Le Bars, J ^[1]

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1. CEN/Saclay, Gif-sur-Yvette (France)

A development using magneto-optic sensors is underway for the location of the magnetic center of long, small aperture, superconducting quadrupole magnets. The paper will describe the measuring methods and the preliminary results which have been obtained with gradients from 2.5 T/m to 10 T/m. The sensor are made of magneto-optic garnets using the Faraday effect which changes an incident beam of linearly polarized light into a transmitted beam of elliptically polarized light. An optical fiber bundle ([O] < 20 [mu]m) carries the incident light to a polarized film, put above the magneto optic sensor. An analyzer films collects the transmitted light. A second optic fiber bundle carries this light toward a visual (microscope, video camera) or analogic data acquisition system. Furthermore, a level is associated with these crystals to determine the gravity direction. The mole'' is moving along the axis of a warm bore tube when the magnet is superconducting. The present results are promising for measuring quadrupoles of much higher gradients, up to 100 T/m.

• OSTI ID: 6583097
• Report Number(s): CONF-930926-; CODEN: IEMGAQ
• Journal Information: IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States), Vol. 30:4Pt2; Conference: 13. international conference on magnet technology, Victoria (Canada), 20-24 Sep 1993; ISSN 0018-9464
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
47 OTHER INSTRUMENTATION
MAGNETIC FIELDS
MEASURING METHODS
MEASURING INSTRUMENTS
DESIGN
SUPERCONDUCTING MAGNETS
EXPERIMENTAL DATA
OPTICAL FIBERS
DATA
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
EQUIPMENT
FIBERS
INFORMATION
MAGNETS
NUMERICAL DATA
SUPERCONDUCTING DEVICES
665412* - Superconducting Devices- (1992-)
440800 - Miscellaneous Instrumentation- (1990-)