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Performances of a Compact Shielded Superconducting Magnet for Continuous Nuclear Demagnetization Refrigerator

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Abstract

We have successfully developed and tested a compact shielded superconducting (SSC) magnet with a FeCoV magnetic shield. This was developed for the PrNi5-based nuclear demagnetization refrigerator which can keep temperatures below 1 mK continuously (CNDR) (Toda et al. in J Phys Conf Ser 969:012093, 2018). The clear bore diameter, outer diameter, and total length of the SSC magnet are 22, 42, and 169 mm, respectively, and it produces the maximum field of 1.38 T at an electric current of 6 A. In order to realize both the compactness and the high shielding performance, we carefully chose material and optimized design of the magnetic shield by numerical simulations of the field distribution based on typical magnetization curves of several candidate materials with high permeability. We also measured the heat generated by sweeping the SSC magnet in vacuum to be 248 mJ per field cycle. This value agrees very well with an estimation from the measured magnetic hysteresis of the superconducting wire used to wind the magnet.

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Acknowledgements

This work was financially supported by Grant-in-Aid for Challenging Exploratory Research (Grant No. 15K13398) from JSPS. ST was supported by Japan Society for the Promotion of Science through Program for Leading Graduate Schools (MERIT).

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Authors and Affiliations

  1. Cryogenic Research Center, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo, Japan

    S. Takimoto, R. Toda, S. Murakawa & Hiroshi Fukuyama

  2. Department of Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan

    Hiroshi Fukuyama

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  1. S. Takimoto
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  2. R. Toda
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  3. S. Murakawa
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  4. Hiroshi Fukuyama
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Correspondence to S. Takimoto.

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Takimoto, S., Toda, R., Murakawa, S. et al. Performances of a Compact Shielded Superconducting Magnet for Continuous Nuclear Demagnetization Refrigerator. J Low Temp Phys 201, 179–186 (2020). https://doi.org/10.1007/s10909-019-02331-2

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  • DOI: https://doi.org/10.1007/s10909-019-02331-2

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