Abstract
The safety and health problems of an experimental magnetic fusion facility for a static magnetic field and variable electric and magnetic fields were considered. Static magnetic field strength was measured with a gauss meter in a large helical device (LHD) hall and outside of the 2-m concrete wall used as the radiation shield. In the case of 1.5T plasma operation, the magnetic field strength was 70mT near the cryostat and 0.05mT outside of the radiation shield. The measured magnetic strength values almost agreed with those calculated. The magnetic field strength of extremely low frequencies was measured using some commercially available monitors at the LHD site. All measured values were less than the occupational regulation levels proposed by the International Commission on Non-Ionizing Radiation Protection (ICNIRP). Reasonable management of electromagnetic workplaces based on guidelines should be proposed for occupational safety, and active continuous survey is recommended for the facility.
