Monopole ’83 pp 451-460

Part of the NATO ASI Series book series (NSSB, volume 111)

Monopole Search at IBM: Present Status and Future Plans

  • C. C. Chi
  • C. D. Tesche
  • C. C. Tsuei
  • P. Chaudhari
  • S. Bermon

Abstract

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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References

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    The coincident detection area of a coincident detector is defined to be the sensing area of a single planar detector which has the same detection rate as the coincident detector for an isotropic flux of monopoles. The sensing area of a planar detector, averaged over 4π solid angle, is one half of its physical area.Google Scholar
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    The SQUIDs used in this experiment are rf SQUIDs manufactured by SHE Inc.Google Scholar

Copyright information

© Plenum Press, New York 1984

Authors and Affiliations

  • C. C. Chi
    • 1
  • C. D. Tesche
    • 1
  • C. C. Tsuei
    • 1
  • P. Chaudhari
    • 1
  • S. Bermon
    • 1
  1. 1.IBM T.J. Watson Research CenterYorktown HeightsUSA

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