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We developed a human-size， open-structure， vertical cylindrical magnetic shield consisting of four shells． The inner diameters of four shells are O.67m，0.72m，0.82m， and O.97m， respectively． The length...s of the shells are l．80m，2．20m，2．43m， and 2．75m， respectively． The first shell is made of Permalloy（2.lmm thick）． Other three shells， made of amorphous ribbons（～50mm wide，～22μm thick），employ magnetic shaking． The second shell consists of four subdivided helical shells with internal space～1cm． Each subdivided helical shells comprises of 121ayers， the amorphous ribbons are wound helically．Outer two shells are axial-structure， where the ribbons are placed along the axial direction of the cylinder． The third shell has 261ayers and the fourth shell has 301ayers of the amorphous ribbons． The shielding factor measured at the center was～100，000 for the transversal magnetic field and～380 for the axial magnetic field， in which cases the amplitude of the magnetic field was lO,000nT． Leakage field from the shaking coils at the center of the shield was below lnT that permits operation of highly sensitive SQUID magnetometers．続きを見る
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