Reduction of Error in Magnetic Knife Method to Measure&lt;tex&gt;$J_rm c$&lt;/tex&gt;Distribution of YBCO Coated Conductor

Maruyama, Osamu; Miyashita, M.; Sato, Susumu; Amemiya, Naoyuki; Saitoh, Takashi; Yamada, Yuichi; Shiohara, Yuh

doi:10.1109/tasc.2005.864322

Cited by 4 publications

(3 citation statements)

References 8 publications

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“…Contrary to the magnetic knife method [21][22][23][24], limited to the critical current distribution only, this method allows the reconstruction of the static or varying current distribution in every level of the current, within the critical values +I c , −I c , including frozen or remnant currents.…”

Section: The Methods Of Magneto-optic Imagingmentioning

confidence: 99%

Errors in measurement of current distribution in a superconducting tape

Usak¹

2011

Supercond. Sci. Technol.

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The paper reports on the role of the typical mapping errors in measurement of the lateral sheet current distribution Iy(x) in a superconducting tape. The sheet current is calculated indirectly, from the mapped data of the self magnetic field of the superconducting layer. The field is generated by transport or induced current in a tape. In model calculations examples of the influence of the different types of errors on false shaping of the lateral sheet current profile are given. The field mapping is made outside and over the tape. The lateral profile Bz(x, z) of the magnetic field component, perpendicular to the superconducting layer, is input to the Biot–Savart inverse procedure. In the experiment we have used superconducting tape as a sample and an InSb Hall probe with active surface 20 × 20 µm2 as a magnetic field sensor. We demonstrate the details, together with obstacles and errors encountered in measurement and subsequent evaluation. The demonstrations serve for the reader to be aware of limits in interpretation of the measured data and to overcome the natural barrier in understanding, insight and use of this fruitful method.

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Section: The Methods Of Magneto-optic Imagingmentioning

confidence: 99%

Errors in measurement of current distribution in a superconducting tape

Usak¹

2011

Supercond. Sci. Technol.

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“…Fig. 1 shows the magnetic knife set-up [10]. The windings are excited to produce magnetic flux in opposite directions in the gap between two iron cores as shown in Fig.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Among them, coated conductors with magnetic substrate are being considered to be promising for their practical applications because of potential low cost due to their simple fabricating process [4][5][6]. Magnetic knife method to measure lateral as well as longitudinal J c distribution in coated conductors with nonmagnetic substrate has been well established [7][8][9][10]. However, the influence of the substrate magnetism of coated conductors on the J c distribution measurement was not reported, even though accurately measuring the J c distribution in the coated conductors with magnetic substrate is very important for improving their fabrication processes as well as for clarifying the influence of the J c distribution on AC loss characteristics [11][12][13].…”

Section: Introductionmentioning

confidence: 99%