August 27, 2017 to September 1, 2017
RAI Congress Center, Amsterdam, The Netherlands
Europe/Amsterdam timezone

Cryogenic Hybrid Magnet with Praseodymium Permanent Magnet

Aug 30, 2017, 1:15 PM
1h 45m
Posters Area

Posters Area

Poster Presentation of 1h45m F10 - Other Magnet Components Wed-Af-Po3.10


Yasuhiro Fuwa (Kyoto University)


High-field magnets are often demanded for advanced scientific studies. Although a hybrid coil design comprising Nb-Ti, Nb3Sn, and HTS (High Temperature Superconductors) are potential candidates for such application, the costs of Nb3Sn and HTS are expensive compared with Nb-Ti. Permanent magnet can join hybrid magnets. By generating additional field about 1 T by permanent magnets, required amounts of superconducting material may be reduced. Magnetic properties of some magnetic materials have been studied by other work at temperature as low as 100 K. The remanent field of conventional NdFeB magnets decreases at 100 K due to spin reorientation. PrFeB magnets consisting of praseodymium (Pr) instead of neodymium (Nd) do not show such degradation and the coercivity of PrFeB at 100 K is 7 T. The coercivity at 4 K would be estimated as 10 T by a naive extrapolation. Therefore, PrFeB magnets may be applicable as the field booster in the high-field hybrid magnets. In this study, B-H curve, as a primary magnetic property, of a PrFeB magnet sample was measured in the temperature range down to 4 K. Based on the experimental result, magnet configuration for an accelerator dipole magnet is also studied as an example of application.

Submitters Country Japan

Primary authors

Yasuhiro Fuwa (Kyoto University) Yoshihisa Iwashita Dr Akihiro Kondo (University of Tokyo) Dr Masato Sagawa (Intermetallics CO.,LTD.)

Presentation materials