The Magnetization of Bi:2212 Rutherford Cables for Particle Accelerator Applications

High temperature superconductors, including Bi:2212, are being considered for high magnetic field magnets to be used in particle accelerators. A knowledge of HTS magnetization properties are needed for calculating field errors in such accelerator magnets. Here we present magnetic measurements of a 1...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2021-08, Vol.31 (5), p.1-5
Main Authors: Rochester, Jacob, Myers, Cory, Sumption, Mike, Shen, Tengming, Majoros, Milan, Collings, E.W.
Format: Article
Language:English
Subjects:
accelerator magnets
Bi:2212
Cables
Calibration
Diameters
effective filament diameter
Hall probes
High temperature superconductors
Magnetic field measurement
Magnetic measurement
Magnetic properties
Magnetic shielding
Magnetism
Magnetization
Magnetometers
Magnets
Mathematical analysis
Nickel
Particle accelerators
Rutherford cables
Superconducting cables
Superconducting magnets
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Summary:High temperature superconductors, including Bi:2212, are being considered for high magnetic field magnets to be used in particle accelerators. A knowledge of HTS magnetization properties are needed for calculating field errors in such accelerator magnets. Here we present magnetic measurements of a 17 strand Bi:2212 Rutherford cable. The Bi:2212 strand was a Bruker OST PMM170123 non-twisted wire wound into a cable with dimensions 1.46 mm x 7.8 mm and cable pitch of 50.8 mm. M-H loop measurements were made with a Hall probe at 4.2 K. Two calibration methods were compared, (i) a flux exclusion approach, and (ii) a Ni replacement technique. The latter was found to be more reliable in this case. An effective filament diameter of 358 μm was calculated for the strand at 4.2 K and a perpendicular applied field of 3.33 T, significantly larger than the diameter of the filament bundle. Magnetization values at 1 T on the shielding branch were seen to be 100 kA/m when normalized to the total strand in the cable volume. The penetration field ≅ 0.4 T.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2021.3059985