[Table of Contents]

Plasma and Fusion Research

Volume 7, 2405085 (2012)

Regular Articles

Electromagnetic Fields Measurement and Safety Consideration in Magnetic Confinement Fusion Test Facilities
Tatsuhiko UDA, Masahiro TANAKA, Shizuhiko DEJI1), Jianqing WANG2) and Osamu FUJIWARA2)
National Institute for Fusion Science, 322-6 Oroshi, Toki 509-5292, Japan
Gifu University of Medical Science, Hiraganagamine, Seki 501-3892, Japan
Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555, Japan
(Received 29 November 2011 / Accepted 2 April 2012 / Published 26 July 2012)


The environmental electromagnetic fields were measured around a magnetic confinement fusion test facility namely Large Helical Device (LHD) which is equipped with large superconducting magnet coils system and high-power plasma heating systems of Neutral Beam Injection, Electron Cyclotron resonance Heating and Ion Cyclotron Range of Frequencies (ICRF) heating. The leakage of the static magnetic field from the LHD was less than 1.2 mT, and it varied according to the coil operation. The extremely low frequency electromagnetic field was measured around power supply units for the coil system, and the magnetic field of higher than the guideline level of the International Commission on Nonionizing Radiation Protection (ICNIRP) was predicted. Leakage of high frequency electromagnetic field from the ICRF was observed in bursts according to plasma shots. The measured values were less than the occupational guideline levels. Although the electromagnetic fields were less than the regulation levels, more monitoring survey is necessary from the view point of occupational safety.


magnetic confinement fusion facility, LHD, static magnetic field, ICRF, electromagnetic fields, safety

DOI: 10.1585/pfr.7.2405085


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This paper may be cited as follows:

Tatsuhiko UDA, Masahiro TANAKA, Shizuhiko DEJI, Jianqing WANG and Osamu FUJIWARA, Plasma Fusion Res. 7, 2405085 (2012).