GAS EVOLUTION FROM INSULATING MATERIALS FOR SUPERCONDUCTING COIL OF ITER BY GAMMA RAY IRRADIATION AT LIQUID NITROGEN TEMPERATURE
- Japan Atomic Energy Agency (JAEA), Quantum Beam Science Directorate Takasaki, Gunma, 370-1292 (Japan)
- Japan Atomic Energy Agency (JAEA), Fusion Research and Development Directorate Naka, Ibaraki, 311-0193 (Japan)
A laminated material composed of glass cloth/polyimide film/epoxy resin will be used as an insulating material for superconducting coil of International Thermonuclear Experimental Reactor (ITER). In order to keep safe and stable operation of the superconducting coil system, it is indispensable to evaluate radiation resistance of the material, because the material is exposed to severe environments such as high radiation field and low temperature of 4 K. Especially, it is important to estimate the amount of gases evolved from the insulating material by irradiation, because the gases affect on the purifying system of liquid helium in the superconducting coil system. In this work, the gas evolution from the laminated material by gamma ray irradiation at liquid nitrogen temperature (77 K) was investigated, and the difference of gas evolution behavior due to difference of composition in the epoxy resin was discussed. It was found that the main gases evolved from the laminated material by the irradiation were hydrogen, carbon monoxide and carbon dioxide, and that the amount of gases evolved from the epoxy resin containing cyanate ester was about 60% less than that from the epoxy resin containing tetraglycidyl-diaminophenylmethane (TGDDM)
- OSTI ID:
- 21136733
- Journal Information:
- AIP Conference Proceedings, Vol. 986, Issue 1; Conference: International Cryogenic Materials Conference - ICMC, Vol. 54: Advances in cryogenic engineering materials, Chattanooga, TN (United States), 16-20 Jul 2007; Other Information: DOI: 10.1063/1.2900341; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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