Influence of gamma ray irradiation on thermal conductivity of bismaleimide-triazine-based insulation tape at cryogenic temperaturehttp://www-comet.kek.jp/COMET5/publications/influence-of-gamma-ray-irradiation-on-thermal-conductivity-of-bismaleimide-triazine-based-insulation-tape-at-cryogenic-temperaturehttp://www-comet.kek.jp/COMET5/@@site-logo/logo.png
Influence of gamma ray irradiation on thermal conductivity of bismaleimide-triazine-based insulation tape at cryogenic temperature
a Kyushu University, Motooka 744, Nishi-ku, Fukuoka 819-0395, Japan b High Energy Accelerator Research Organization (KEK), Oho 1-1, Tsukuba, Ibaraki 305-0801, Japan c National Institutes for Quantum and Radiological Science and Technology (QST), Watanuki 1233, Takasaki, Gunma 370-1292, Japan
Recent accelerator-based experiments for particle physics require the superconducting magnets that can be operated under high radiation environment. An electrical insulation tape, which is composed of polyimide film and a boron free glass fabric pre-impregnated with epoxy resin blended with bismaleimide-triazine resin, is developed to enhance the radiation tolerance for superconducting magnets. Since the thermal conductivity of insulation tape is one of key parameters that affects the coil temperature during the operation, the influence of gamma-ray irradiation on the thermal conductivity of the insulation tape is investigated with a maximum dose of 5 MGy. The thermal conductivityis measured at cryogenic temperature from 5 K to 20 K cooled by a Gifford-McMahon cryocooler. By comparing the thermal conductivity before and after the gamma ray irradiation, no significant degradation on the thermal conductivity has been observed.
