Study on Magnetic Flux Dissipation and Field-Trapping Performance of HTS Bulk-Shaped Magnesium Diboride in Pulse-Field Magnetizing Processes

Tetsuo Oka, Akira Takeda, Hayami Oki, Jun Ogawa, Satoshi Fukui, Juliana Scheiter, Wolfgang Häßler, Kazuya Yokoyama, Kengo Yamanaka, Longji Dadiel, Muralidhar Miryala, Naomichi Sakai, Masato Murakami, Jacques Noudem

Research output: Contribution to journal › Article

Abstract

The magnetic flux dissipation from the MgB2 bulk magnets during pulsed field magnetization (PFM) processes has been estimated for the samples fabricated by hot-pressing (HP) and spark plasma sintering (SPS). We defined the parameters as field penetration ratio BP/Ba and the field trapping ratio BT/BP to evaluate the flux motion and performance. The data plots of trapping ratio BT/BP showed us two regions which originate from the fast flux flow and flux jump. The field trapping performance was drastically degraded when the flux jump happened. Flux jump happened at various times after the peak field. A very late flux jump happened at 420 ms which severely degraded the trapped field. This time delay, much larger than the heat propagation time in the MgB2 sample, remains to be explained.

Original languageEnglish
Article number8678817
JournalIEEE Transactions on Applied Superconductivity
Volume29
Issue number5
DOIs
Publication statusPublished - 2019 Aug 1

Fingerprint

Magnetic flux
Magnesium
magnetic flux
magnesium
dissipation
trapping
Fluxes
pulses
Spark plasma sintering
hot pressing
Hot pressing
sparks
Magnets
magnesium boride
Magnetization
Time delay
sintering
magnets
time lag
penetration

Keywords

  • Bulk superconductors
  • magnesium compounds
  • magnetic field measurement
  • magnetization processes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

Study on Magnetic Flux Dissipation and Field-Trapping Performance of HTS Bulk-Shaped Magnesium Diboride in Pulse-Field Magnetizing Processes. / Oka, Tetsuo; Takeda, Akira; Oki, Hayami; Ogawa, Jun; Fukui, Satoshi; Scheiter, Juliana; Häßler, Wolfgang; Yokoyama, Kazuya; Yamanaka, Kengo; Dadiel, Longji; Miryala, Muralidhar; Sakai, Naomichi; Murakami, Masato; Noudem, Jacques.

In: IEEE Transactions on Applied Superconductivity, Vol. 29, No. 5, 8678817, 01.08.2019.

Research output: Contribution to journal › Article

Oka, T, Takeda, A, Oki, H, Ogawa, J, Fukui, S, Scheiter, J, Häßler, W, Yokoyama, K, Yamanaka, K, Dadiel, L, Miryala, M, Sakai, N, Murakami, M & Noudem, J 2019, 'Study on Magnetic Flux Dissipation and Field-Trapping Performance of HTS Bulk-Shaped Magnesium Diboride in Pulse-Field Magnetizing Processes', IEEE Transactions on Applied Superconductivity, vol. 29, no. 5, 8678817. https://doi.org/10.1109/TASC.2019.2908752
Oka T, Takeda A, Oki H, Ogawa J, Fukui S, Scheiter J et al. Study on Magnetic Flux Dissipation and Field-Trapping Performance of HTS Bulk-Shaped Magnesium Diboride in Pulse-Field Magnetizing Processes. IEEE Transactions on Applied Superconductivity. 2019 Aug 1;29(5). 8678817. https://doi.org/10.1109/TASC.2019.2908752
Oka, Tetsuo ; Takeda, Akira ; Oki, Hayami ; Ogawa, Jun ; Fukui, Satoshi ; Scheiter, Juliana ; Häßler, Wolfgang ; Yokoyama, Kazuya ; Yamanaka, Kengo ; Dadiel, Longji ; Miryala, Muralidhar ; Sakai, Naomichi ; Murakami, Masato ; Noudem, Jacques. / Study on Magnetic Flux Dissipation and Field-Trapping Performance of HTS Bulk-Shaped Magnesium Diboride in Pulse-Field Magnetizing Processes. In: IEEE Transactions on Applied Superconductivity. 2019 ; Vol. 29, No. 5.
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abstract = "The magnetic flux dissipation from the MgB2 bulk magnets during pulsed field magnetization (PFM) processes has been estimated for the samples fabricated by hot-pressing (HP) and spark plasma sintering (SPS). We defined the parameters as field penetration ratio BP/Ba and the field trapping ratio BT/BP to evaluate the flux motion and performance. The data plots of trapping ratio BT/BP showed us two regions which originate from the fast flux flow and flux jump. The field trapping performance was drastically degraded when the flux jump happened. Flux jump happened at various times after the peak field. A very late flux jump happened at 420 ms which severely degraded the trapped field. This time delay, much larger than the heat propagation time in the MgB2 sample, remains to be explained.",
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AU - Fukui, Satoshi

AU - Scheiter, Juliana

AU - Häßler, Wolfgang

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AB - The magnetic flux dissipation from the MgB2 bulk magnets during pulsed field magnetization (PFM) processes has been estimated for the samples fabricated by hot-pressing (HP) and spark plasma sintering (SPS). We defined the parameters as field penetration ratio BP/Ba and the field trapping ratio BT/BP to evaluate the flux motion and performance. The data plots of trapping ratio BT/BP showed us two regions which originate from the fast flux flow and flux jump. The field trapping performance was drastically degraded when the flux jump happened. Flux jump happened at various times after the peak field. A very late flux jump happened at 420 ms which severely degraded the trapped field. This time delay, much larger than the heat propagation time in the MgB2 sample, remains to be explained.

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