Monopole ’83 pp 451-460
Monopole Search at IBM: Present Status and Future Plans
A novel magnetic monopole detection scheme using superconducting high-order planar gradiometers has been successfully designed and tested. A prototype of two parallel gradiometers monitored by two independent SQUIDs was built and operated for a period of more than 5 months. With no monopole events observed, it established an upperbound of monopole flux of 1.7 × 10−10 cm−2 sr−1 s−1 at a 90% confidence level. A larger detector of six planar gradiometers on the facets of a parallelopiped with a coincident detection area 40 times that of the prototype is currently running. A flux bound of 2.0 × 10−11 cm−2 sr−1 s−1 at a 90% confidence level has been established by this detector as of February 1984. An even larger detector with a coincident detection area about 3 m2 is now in the planning stage.
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