Influence of AC external magnetic field perturbation on trapped magnetic field in HTS bulk

Ogawa, J.; Iwamoto, M.; Yamagishi, K.; Tsukamoto, O.; Murakami, Masato; Tomita, Masaru

doi:10.1016/s0921-4534(02)02114-7

Cited by 53 publications

(19 citation statements)

References 2 publications

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“…It has been shown that the AC loss characteristics of a short-cylinder YBCO bulk were well described by a cylinder model of infinite length following the Bean model [5]. Losses in a superconductor cylinder subject to AC external magnetic field of amplitude B m parallel to the cylinder axis are given by the following equations [6]:…”

Section: Temperature Rise Of Bulk Caused By Ac Lossesmentioning

confidence: 99%

Mechanism of decay of trapped magnetic field in HTS bulk caused by application of AC magnetic field

Tsukamoto

Yamagishi

Ogawa

et al. 2005

Journal of Materials Processing Technology

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Section: Temperature Rise Of Bulk Caused By Ac Lossesmentioning

confidence: 99%

Mechanism of decay of trapped magnetic field in HTS bulk caused by application of AC magnetic field

Tsukamoto

Yamagishi

Ogawa

et al. 2005

Journal of Materials Processing Technology

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“…Comparatively, the longitudinal field component drops suddenly far below the initial value at high frequencies. The decay of trapped field by applying AC fields was also studied by J. Ogawa et al [3]. The influences of perpendicular AC-field perturbations were experimentally investigated in their experiments.…”

Section: Experimental Phenomenamentioning

confidence: 99%

Electromagnetic Phenomena in HTS Bulk Subjected to a Rotating Field

Qiu

Huo

et al. 2004

IEEE Trans. Appl. Supercond.

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In HTS rotating systems, it is possible for HTS bulk to be subjected to rotating magnetic fields due to various inhomogeneities. The dynamic response of HTS will strongly affect the operating characteristics. In this paper, we rely on flux dynamics to study the magnetic behavior of HTS bulk in a rotating field. The flux evolution, the possible electromagnetic oscillation, the effect of the anisotropy and the role of transverse rotating-field component are qualitatively discussed. The associated losses are derived from numerical simulation.

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“…The AC magnetic field was subjected to a uniform AC magnetic field applied to the bulk by a solenoid copper coil positioned parallel to the bulk axis. For electrical measurements, we used the double pick-up coil method [4]- [6]. A pair of cylindrical pick-up coils of the same height but of different diameters surrounded the bulk.…”

Section: A Experimental Arrangementmentioning

confidence: 99%

Influence of High Frequency AC Magnetic Field on Trapped Magnetic Field

Ogawa

Fukui

Oka

et al. 2007

IEEE Trans. Appl. Supercond.

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The trapped magnetic field in an HTS bulk is decayed and even erased by the application of an AC magnetic field whose amplitude is much smaller than the maximum trapped magnetic field. In previous experiments, the decay of the trapped magnetic field was shown to be due to the temperature rise of the bulk caused by the AC losses. Especially, in a high frequency magnetic field, AC losses are larger and the decay of the trapped magnetic field is accelerated by this AC loss increase. We investigated the time relationships of the AC loss of the HTS bulk in a high frequency magnetic field using the thermal equilibrium equation.Index Terms-AC loss, bulk temperature, HTS bulk, thermal equilibrium equation, trapped magnetic field.

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Influence of AC external magnetic field perturbation on trapped magnetic field in HTS bulk

Cited by 53 publications

References 2 publications

Mechanism of decay of trapped magnetic field in HTS bulk caused by application of AC magnetic field

Mechanism of decay of trapped magnetic field in HTS bulk caused by application of AC magnetic field

Electromagnetic Phenomena in HTS Bulk Subjected to a Rotating Field

Influence of High Frequency AC Magnetic Field on Trapped Magnetic Field

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