TY - JOUR
T1 - Shielding Effect on Flux Trapping in Pulsed-Field Magnetizing for Mg-B Bulk Magnet
AU - Oka, T.
AU - Yamanaka, K.
AU - Sudo, K.
AU - Dadiel, L.
AU - Ogawa, J.
AU - Yokoyama, K.
AU - H ßler, W.
AU - Noudem, J.
AU - Berger, K.
AU - Sakai, N.
AU - Miryala, M.
AU - Murakami, M.
N1 - Funding Information:
This work has been partially supported by the project named as Strategic Young Researcher Overseas Visits Program for Accelerating Brain Circulation of JSPS.
Publisher Copyright:
© Published under licence by IOP Publishing Ltd.
PY - 2021/7/30
Y1 - 2021/7/30
N2 - MgB2 superconducting bulk materials are characterized as simple and uniform metallic compounds, and capable of trapping field of non-distorted conical shapes. Although pulsed-field magnetization technique (PFM) is expected to be a cheap and an easy way to activate them, the heat generation due to the magnetic flux motion causes serious degradation of captured fields. The authors precisely estimated the flux trapping property of the bulk samples, found that the flux-shielding effect closely attributed to the sample dimensions. The magnetic field capturing of Ti-5.0wt% sample reached the highest value of 0.76 T. The applied field which reached the centre of the sample surface shifted from 1.0 T to 1.2 T with increasing sample thickness from 3.67 mm to 5.80 mm. This means that the shielding effect was enhanced with increasing the sample thickness. Moreover, Ti-addition affected the frequency of flux jump happenings. The occurrence of flux jumps was suppressed in 5.0wt%Ti-added sample. This means that the heat capacity of the compounds was promoted by Ti addition.
AB - MgB2 superconducting bulk materials are characterized as simple and uniform metallic compounds, and capable of trapping field of non-distorted conical shapes. Although pulsed-field magnetization technique (PFM) is expected to be a cheap and an easy way to activate them, the heat generation due to the magnetic flux motion causes serious degradation of captured fields. The authors precisely estimated the flux trapping property of the bulk samples, found that the flux-shielding effect closely attributed to the sample dimensions. The magnetic field capturing of Ti-5.0wt% sample reached the highest value of 0.76 T. The applied field which reached the centre of the sample surface shifted from 1.0 T to 1.2 T with increasing sample thickness from 3.67 mm to 5.80 mm. This means that the shielding effect was enhanced with increasing the sample thickness. Moreover, Ti-addition affected the frequency of flux jump happenings. The occurrence of flux jumps was suppressed in 5.0wt%Ti-added sample. This means that the heat capacity of the compounds was promoted by Ti addition.
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U2 - 10.1088/1742-6596/1975/1/012019
DO - 10.1088/1742-6596/1975/1/012019
M3 - Conference article
AN - SCOPUS:85112470970
SN - 1742-6588
VL - 1975
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
IS - 1
M1 - 012019
T2 - 33rd International Symposium on Superconductivity, ISS 2020
Y2 - 1 December 2020 through 3 December 2020
ER -