A one tenth scaled magnetically shielded room of double cylindrical HTS combined with ferromagnetic metals

This paper deals with a cylinder with both ends closed and a hole at the mi ddle point on the side of both cylinders. The holes can be aligned to permi t the examinee to enter or exit the double cylindrical MSR(Magnetically Shi elded Room). An MSR one tenth the size of a human body was made. The diamet er and length of the cylinder were 250mm and 350mm, respectively. The size of the hole was 90mmx180mm. The material used for this MSR was mainly high T-c superconductor with a coating of Bi2Sr2Ca1Cu2Ox 100 mu m thick. The end s of the MSR were plated with permalloy. To detect the inner magnetic field s at various points of the MSR, 33 sensors with three-dimensional sensitivi ty were placed at one closed end. The ratio of the internal to external fie ld strength was measured by applying external magnetic fields parallel and perpendicular to the door. The readings of the ratios obtained were 10(-2) to 10(-3) in the parallel. and 10(-3) to 10(-4) in the perpendicular case.