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

研究成果: Article › 査読

4 被引用数 (Scopus)

抄録

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.

本文言語	English
論文番号	8678817
ジャーナル	IEEE Transactions on Applied Superconductivity
巻	29
号	5
DOI	https://doi.org/10.1109/TASC.2019.2908752
出版ステータス	Published - 2019 8月

ASJC Scopus subject areas

電子材料、光学材料、および磁性材料
凝縮系物理学
電子工学および電気工学

文献へのアクセス

10.1109/TASC.2019.2908752

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引用スタイル

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), 記事 8678817. https://doi.org/10.1109/TASC.2019.2908752

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

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

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.",

keywords = "Bulk superconductors, magnesium compounds, magnetic field measurement, magnetization processes",

author = "Tetsuo Oka and Akira Takeda and Hayami Oki and Jun Ogawa and Satoshi Fukui and Juliana Scheiter and Wolfgang H{\"a}{\ss}ler and Kazuya Yokoyama and Kengo Yamanaka and Longji Dadiel and Muralidhar Miryala and Naomichi Sakai and Masato Murakami and Jacques Noudem",

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doi = "10.1109/TASC.2019.2908752",

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AU - Oka, Tetsuo

AU - Takeda, Akira

AU - Oki, Hayami

AU - Ogawa, Jun

AU - Fukui, Satoshi

AU - Scheiter, Juliana

AU - Häßler, Wolfgang

AU - Yokoyama, Kazuya

AU - Yamanaka, Kengo

AU - Dadiel, Longji

AU - Miryala, Muralidhar

AU - Sakai, Naomichi

AU - Murakami, Masato

AU - Noudem, Jacques

PY - 2019/8

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N2 - 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.

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.

KW - Bulk superconductors

KW - magnesium compounds

KW - magnetic field measurement

KW - magnetization processes

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