Generated heat during pulse field magnetizing for REBaCuO (RE = Gd, Sm, Y) bulk superconductors with different pinning abilities

Hiroyuki Fujishiro, Masahiko Kaneyama, Kazuya Yokoyama, Tetsuo Oka, Koshichi Noto

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Pulse field magnetizing (PFM) using five successive magnetic pulses (Nos 1-5) with the same amplitude from 3.01 to 5.42 T has been performed for three types of cryo-cooled REBaCuO bulk superconductor discs (RE = Gd, Sm, Y) with an identical size. The time evolution and spatial distribution of temperature T(t), the total trapped magnetic flux φT P and the trapped magnetic field BT P have been measured after applying the magnetic pulse. The total magnetic flux φT FC trapped by the field cooled magnetizing (FCM) is the largest for the Gd bulk and is the smallest for the Y bulk. The time and position dependences of T(t) during PFM show a characteristic behaviour depending on the species of bulks which results from the difference in the strength of the pinning force Fp. The generated heat Q(No i) after the No i pulse has been estimated based on the maximum temperature rise ΔTmax and the specific heat C. The ΔQ = Q(No 1)-Q(No 5) value, which is mainly contributed by the pinning power loss (Qp) for pulse No 1, is the smallest for the Y bulk, and the Q(No 5) value, which is mainly contributed by the viscous flow loss (Q v), is the smallest for the Gd bulk. These results suggest that the heat generation by PFM is closely related to the strength of Fp of the bulk crystal.

Original languageEnglish
Pages (from-to)158-165
Number of pages8
JournalSuperconductor Science and Technology
Volume18
Issue number1
DOIs
Publication statusPublished - 2005 Jan 1
Externally publishedYes

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Magnetic flux
Superconducting materials
heat
Heat generation
Viscous flow
pulses
Spatial distribution
Specific heat
Magnetic fields
Temperature
Crystals
magnetic flux
trapped magnetic fields
heat generation
power loss
viscous flow
Hot Temperature
time dependence
spatial distribution
specific heat

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Generated heat during pulse field magnetizing for REBaCuO (RE = Gd, Sm, Y) bulk superconductors with different pinning abilities. / Fujishiro, Hiroyuki; Kaneyama, Masahiko; Yokoyama, Kazuya; Oka, Tetsuo; Noto, Koshichi.

In: Superconductor Science and Technology, Vol. 18, No. 1, 01.01.2005, p. 158-165.

Research output: Contribution to journalArticle

Fujishiro, Hiroyuki ; Kaneyama, Masahiko ; Yokoyama, Kazuya ; Oka, Tetsuo ; Noto, Koshichi. / Generated heat during pulse field magnetizing for REBaCuO (RE = Gd, Sm, Y) bulk superconductors with different pinning abilities. In: Superconductor Science and Technology. 2005 ; Vol. 18, No. 1. pp. 158-165.
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