Speaker
Mike Sumption
(The Ohio State University)
Description
Two different routes have been developed for persistent joints in react and wind MgB2, relevant to MRI. The first uses superconducting solder, the second does not. The joints were developed using standard MgB2 multifilamentary in-situ type strand. Both joint types assumed a react and wind approach. Two types of tests were performed. The first type was a direct I-V (4-point) measurement of the joints. This measurement was made at 4.2 K in fields of up to 7 T, and also at self-field at temperatures up to 30 K. In the second, a persistent current was induced in a small coil and its decay measured. These measurements were performed at 4.2 K, but in some cases in the presence of a background field. Direct I-V measurements show R values of below 10-10 ohms, and an Ic above 100 A at 0.5 T and 4 K for the first joint type. The second joint type achieved 200 A at several Tesla and 4.2 K. Results of numerous direct I-V and several drift measurements are compared, and the utility for MRI systems is discussed.
Author
Mike Sumption
(The Ohio State University)
Co-authors
David Doll
(Hypertech)
Guangze Li
(MSE, The Ohio State University)
Matt Rindfleisch
(Hyper Tech)
Mike Tomsic
(Hyper Tech)
Prof.
ted collings
(MSE, The Ohio State University)
