Hill, G.2013-10-072013-10-072013Physical Review D: Particles, Fields, Gravitation and Cosmology, 2013; 87(2):1-111550-79981550-2368http://hdl.handle.net/2440/80361Article part of CHORUS PilotWe present the first results in the search for relativistic magnetic monopoles with the IceCube detector, a subsurface neutrino telescope located in the South Polar ice cap containing a volume of 1  km³. This analysis searches data taken on the partially completed detector during 2007 when roughly 0.2  km³ of ice was instrumented. The lack of candidate events leads to an upper limit on the flux of relativistic magnetic monopoles of Φ(90%C.L.)∼3×10⁻¹⁸  cm⁻² sr⁻¹ s⁻¹ for β≥0.8. This is a factor of 4 improvement over the previous best experimental flux limits up to a Lorentz boost γ below 10⁷. This result is then interpreted for a wide range of mass and kinetic energy values.en© 2013 American Physical SocietyJournal article002012467810.1103/PhysRevD.87.0220010003137538000012-s2.0-8487297778721721