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http://dx.doi.org/10.9714/psac.2015.17.1.021

Magnetization of the stack of HTS tapes  

Osipov, M.A. (National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), International Laboratory of High Magnetic Fields and Low Temperatures)
Abin, D.A. (National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), International Laboratory of High Magnetic Fields and Low Temperatures)
Pokrovskiy, S.V. (National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), International Laboratory of High Magnetic Fields and Low Temperatures)
Mineev, N.A. (National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), International Laboratory of High Magnetic Fields and Low Temperatures)
Rudnev, I.A. (National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), International Laboratory of High Magnetic Fields and Low Temperatures)
Publication Information
Progress in Superconductivity and Cryogenics / v.17, no.1, 2015 , pp. 21-24 More about this Journal
Abstract
New results of dependence of magnetic field, trapped by a stack of HTS tapes, on amount of tapes in a stack are reported. Commercial GdBCO tape 12 mm width and without Cu layer was used for the research. Tape was divided in square pieces $12{\times}12mm^2$ from which stacks were formed. Filling factor of the tape was about 1.4%. Measurements were carried out for stacks with height from 5 to 250 pieces and at wide temperature range from liquid helium to liquid nitrogen. Both FC (field cooling) and ZFC (zero field cooling) cooling methods were used in the research. These two methods show matching results with good accuracy. As a result dependences of trapped magnetic flux on amount of tapes for different temperatures were received. Research shows, that with increasing height of the stack trapped magnetic field value reach saturation at about 60 tapes in a stack for low temperatures. From 60 to 100 tapes increase of magnet flux is only 5%. Thus increase amount of tapes in a stack is not profitable. Also investigation of trapped magnet field relaxation was carried out. Relaxation speed decreases with increasing amount of elements. It means that the higher the stack is, the longer trapped flux will be held in cause of the same temperature.
Keywords
Coated conductors; HTS stacks; trapped field magnets; relaxation of magnetic flux;
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