Trapped field characteristics on φ65mm GdBaCuO bulk by modified multi-pulse technique with stepwise cooling (MMPSC)

Fujishiro, Hiroyuki; Tateiwa, Tetsuya; Kakehata, Kosuke; Hiyama, T.; Naito, Tomoyuki; Yanagi, Yousuke

doi:10.1016/j.physc.2008.05.142

Cited by 11 publications

(8 citation statements)

References 11 publications

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“…chemical solution deposition (CSD) and ink-jet printing [4]. Large (RE)BCO bulks can be manufactured with high quality [5] but it is a challenge to maintain high J c far away from the seed crystal which lies at the centre compared to wide (RE)BCO tapes with uniform J c [6]. Field cooling of square annuli cut from large 40 mm wide tape manufactured by American Superconductor has been performed in liquid nitrogen [7], but results for magnetization below 77 K have not yet been published.…”

Section: Introductionmentioning

confidence: 99%

Trapped fields up to 2 T in a 12 mm square stack of commercial superconducting tape using pulsed field magnetization

Patel

Hopkins

Glowacki

2013

Supercond. Sci. Technol.

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The ability of superconductors to sustain persistent currents has been well exploited with (RE)BCO superconducting bulks, which can be magnetized to form a compact source of high magnetic field. However, thin films can also sustain persistent currents, which can be utilized by stacking them in layers to create a type of composite bulk. Such a stack is capable of trapping higher fields than a bulk, as reported in this paper. 12 mm wide, 55 µm thick commercial (RE)BCO tape from Superpower Inc was cut into 12 mm by 12 mm squares, stacked together and magnetized at temperatures between 10 and 77.4 K using a sequence of pulsed magnetic fields. The results are compared to a commercial 14 mm diameter YBCO bulk, showing that the stack of tapes outperformed the bulk at temperatures below approximately 60 K. Particularly high trapped fields were achieved below 50 K, with a maximum of 2.0 T at 10 K measured 0.8 mm from the stack surface. The maximum trapped field possible for a stack of tapes increases significantly with decreasing temperature down to 10 K, rather than saturating at a higher temperature as in the case of a bulk, due to superior thermal stability. The J c , thermal and mechanical properties of commercial (RE)BCO tapes give them great potential for use as trapped field magnets activated by pulsed magnetic fields.

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Section: Introductionmentioning

confidence: 99%

Trapped fields up to 2 T in a 12 mm square stack of commercial superconducting tape using pulsed field magnetization

Patel

Hopkins

Glowacki

2013

Supercond. Sci. Technol.

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“…B P T = 5.20 T is the highest recorded value by PFM to date. We applied the technique to other bulks with different pinning ability and confirmed that the MMPSC was a universal and effective method to enhance B P T [10]. The IMRA method has been reported to be valuable for the enhancement of the T value [5].…”

Section: Introductionmentioning

confidence: 80%

Enhancement of trapped field and total trapped flux on GdBaCuO bulk by the MMPSC+IMRA method

Fujishiro¹,

Hiyama²,

Naito³

et al. 2009

Supercond. Sci. Technol.

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The trapped field B P T (z) and the total trapped flux T (z) as a function of the distance z from the bulk surface have been measured on a GdBaCuO superconducting bulk of 45 mm in diameter, which was magnetized by a sequential pulsed field application (SPA) method, a modified multi-pulse technique with stepwise cooling (MMPSC), and a subsequent iterative magnetizing operation with gradually reduced pulse field amplitude (IMRA). A trapped field of B P T = 3.10 T was realized by the MMPSC method, which was higher than that attained by SPA (B P T = 2.35 T). T (0.5 mm), which was 1.64 mWb after the MMPSC method, was enhanced by about 53%, to 2.51 mWb, by the subsequent IMRA method due to the additional flux trapping. The MMPSC method combined with the IMRA process (MMPSC + IMRA) is an effective and promising pulse field magnetizing technique to enhance both B P T and T on any superconducting bulks.

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“…We have investigated the trapped field characteristics on the φ65 mm GdBaCuO bulk by the successive pulse application (SPA) [9] and the MMPSC method [10]. The maximum trapped field on the φ65 mm bulk using SPA was as low as B T P =1.9 T at 40 K, but B T P was enhanced to 3.0 T using the MMPSC method, which were fairly smaller than those on the φ45 mm GdBaCuO bulk [7].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Enhancement of total trapped fluxes on φ65mm GdBaCuO bulk by multi-pulse techniques

Fujishiro

Kakehata

Naito

et al. 2009

Physica C: Superconductivity

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We have investigated the total trapped flux Φ T (z) on the φ65 mm GdBaCuO superconducting bulk as a function of distance z from the bulk surface magnetized by a successive pulse field application (SPA) with identical magnitude and subsequent iterative pulsed-field magnetization method with reducing the amplitude (IMRA) at various temperatures T s . The Φ T (z) value was enhanced by the IMRA process and reached 5.02 mWb on the bulk surface at T s =40 K, which was about 1.7 times larger than that at the end of SPA. The Φ T (4 mm) value at 40 K by the SPA+IMRA method was as high as Φ T FC (4 mm) by field cooled magnetization under B ex =3 T at 48 K. The IMRA method is quite effective to enhance the Φ T value for large superconducting bulks.(125 words) ACCEPTED MANUSCRIPT2

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Trapped field characteristics on φ65mm GdBaCuO bulk by modified multi-pulse technique with stepwise cooling (MMPSC)

Cited by 11 publications

References 11 publications

Trapped fields up to 2 T in a 12 mm square stack of commercial superconducting tape using pulsed field magnetization

Trapped fields up to 2 T in a 12 mm square stack of commercial superconducting tape using pulsed field magnetization

Enhancement of trapped field and total trapped flux on GdBaCuO bulk by the MMPSC+IMRA method

Enhancement of total trapped fluxes on φ65mm GdBaCuO bulk by multi-pulse techniques

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