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

doi:10.1109/TASC.2019.2908752

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 B_P/B_a and the field trapping ratio B_T/B_P to evaluate the flux motion and performance. The data plots of trapping ratio B_T/B_P 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 language	English
Article number	8678817
Journal	IEEE Transactions on Applied Superconductivity
Volume	29
Issue number	5
DOIs	https://doi.org/10.1109/TASC.2019.2908752
Publication status	Published - 2019 Aug

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

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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, 29(5), [8678817]. https://doi.org/10.1109/TASC.2019.2908752

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, 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, 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 - Ogawa, Jun

AU - Fukui, Satoshi

AU - Scheiter, Juliana

AU - Häßler, Wolfgang

AU - Yokoyama, Kazuya

AU - Yamanaka, Kengo

AU - Dadiel, Longji

AU - Miryala, Muralidhar

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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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