Exposure setups for in vitro experiment on biological effects of complex magnetic fields with static and time-varying components

People are exposed to electromagnetic fields from various sources in daily life. Among those sources transportation systems generate complex magnetic fields with static and time-varying components. However, we do not know what effect on living bodies could exist due to exposure to such complex fields. The purpose of this study is to develop exposure setups for in vitro experiments on biological effects caused by complex magnetic fields with static and time-varying components. Complex exposure setups are composed of a superconducting magnet for static field, and coils placed inside the superconducting magnet for sinusoidally time-varying field (AC field). The magnetic flux from the AC-field coils cannot penetrate into the superconducting magnet because of perfect diamagnetism of the superconducting magnet. Therefore the magnetic field created by the AC-field coils placed inside the superconducting magnet is different from that produced by the same AC-field coils placed in free space. In this report time-varying magnetic field distributions in the bore of the superconducting magnet are investigated by numerical analyses.