Thermal conductivity and Kapitza resistance of cyanate ester epoxy mix and tri-functional epoxy electrical insulations at superfluid helium temperature |
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| Authors: | S Pietrowicz A Four S Jones S Canfer B Baudouy |
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| Affiliation: | 1. CEA, Irfu, SACM, F-91191 Gif-sur-Yvette Cedex, France;2. Technology Department, STFC Rutherford Appleton Laboratory, Harwell Oxford, Didcot, Oxon OX11 0QX, UK;1. State key laboratory of optoelectronic materials and technologies, School of Physics Science and Engineering, Sun Yat-sen (Zhongshan) University, Guangzhou, China;2. The Key Laboratory of Low-carbon Chemistry & Energy Conservation of Guangdong Province, Sun Yat-sen (Zhongshan) University, Guangzhou, China;1. National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan;2. Institute of Biomedical Engineering and Environmental Science, National Tsing-Hua University, Hsinchu, 30076, Taiwan;1. Department of Chemistry, Thamirabharani Engineering College, Tirunelveli, Tamil Nadu, India;2. Department of Chemistry, N.M.S.S.V.N. College, Madurai 625 019, Tamil Nadu, India;3. Department of Physics, Mother Teresa Women’s University, Kodaiakanal 624101, Tamil Nadu, India;4. UGC-DAE-CSR, University Campus, Khandwa Road, Indore 452017, India;5. Laboratory of Radical Pharmaco–Chemistry, UMR CNRS 6264, University of the Méditerranée, Faculty of Pharmacy, 27 Bd Jean Moulin, 13385 Marseille Cedex 5, France;6. Department of Physics, N.M.S.S.V.N. College, Madurai 625 019, Tamil Nadu, India |
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| Abstract: | In the framework of the European Union FP7 project EuCARD, two composite insulation systems made of cyanate ester epoxy mix and tri-functional epoxy (TGPAP-DETDA) with S-glass fiber have been thermally tested as possible candidates to be the electrical insulation of 13 T Nb3Sn high field magnets under development for this program. Since it is expected to be operated in pressurized superfluid helium at 1.9 K and 1 atm, the thermal conductivity and the Kapitza resistance are the most important input parameters for the thermal design of this type of magnet and have been determined in this study. For determining these thermal properties, three sheets of each material with different thicknesses varying from 245 to 598 μm have been tested in steady-state condition in the temperature range of 1.6–2.0 K. The thermal conductivity for the tri-functional epoxy (TGPAP-DETDA) epoxy resin insulation is found to be k = (34.2 ± 5.5)?T ? (16.4 ± 8.2)] × 10?3 Wm?1 K?1 and for the cyanate ester epoxy k = (26.8 ± 4.8)?T ? (9.6 ± 5.2)] × 10?3 Wm?1 K?1. For the Kapitza resistance, Rk, the best curve fitting the experimental data is described by Rk = (3057 ± 593) × 10?6?T (?1.79 ± 0.34) m2 KW?1 for the TGPAP-DETDA insulation and Rk = (4114 ± 971) × 10?6?T (?1.73 ± 0.41) m2 KW?1 for the cyanate ester epoxy insulation. Our results are compared with other epoxy based composite electrical insulation found in the literature. |
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