Magnetic flux invasion in REBCO bulk magnets with varying pre-magnetized flux distributions in multiple-PFM processes

29th International Symposium on Superconductivity

Oka, T.^1 ; Hara, K.^1 ; Takeda, A.^1 ; Ogawa, J.^1 ; Fukui, S.^1 ; Sato, T.^1 ; Yokoyama, K.^2 ; Murakami, A.^3

Niigata University, 8050 Ikarashi-Ninocho, Nishi-Ward, Niigata

950-2181, Japan^1

Ashikaga Institute of Technology, 268-1 Ohmae-cho, Ashikaga, Tochigi

326-8558, Japan^2

Ichinoseki National College of Technology, Takanashi, Hagisho, Ichinoseki, Iwate

021-8511, Japan^3

关键词: Effective suppression;    Field application;    Flux distributions;    HTS bulk magnets;    Pulsed-field magnetization;    Trapped field;    Trapped flux;    Trapped-flux densities;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/871/1/012049/pdf
DOI  :  10.1088/1742-6596/871/1/012049

来源: IOP

【 摘 要 】

The motion of magnetic flux invading into the HTS bulk magnets were experimentally studied in their pulsed field magnetization processes. The authors paid attention to the effects of the shapes of the pre-magnetized trapped flux distributions before the successive field applications by means of varying the M-shaped distribution. We estimated the differences of the magnetic flux motions between the Dy123 and Gd123 systems, which might have different Jcproperties of each sample. As for the Dy123 system, the increase of remaining flux in the periphery region of the M-shaped distribution resulted in the decrease of flux-trapping according to the promotion of flux invasion. On the other hand, trapped flux density has been raised to 3.4 T owing to the effective suppression of flux invasion for the Gd123 bulk magnet. The experiments showed that the peak heights and the positions of the formerly trapped M-shaped fluxes precisely affect the heat generation and the trapped field performance.