Magnetic Flux Concentrator Using Gd-Ba-Cu-O Bulk Superconductors

Toko, Kiyoshi; Choi, Seyong; Matsumoto, Shinji; Asano, T.; Uglietti, D.

doi:10.1109/tasc.2009.2018440

Cited by 34 publications

(32 citation statements)

References 6 publications

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“…Traditionally, people simply use superconductors to enhance the background DC magnetic field, which can be used to improve the sensitivity of magnetic sensors [1,[5][6][7][8]. However, these devices can only achieve an enhanced DC magnetic field in a very small region of air (e.g., a region with a diameter of 22 mm) with a very low enhancement factor (e.g., about 2 or 3 times).…”

Section: Introductionmentioning

confidence: 99%

“…For the applications in drug delivery by magnetic nano-particles [3,4], we need an enhanced DC magnetic field with a high gradient in a distant air region. Traditional magnetic lenses [5][6][7][8] cannot achieve these goals. Some novel DC magnetic lenses must be designed for these specific applications and other future potential applications.…”

Section: Introductionmentioning

confidence: 99%

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Transformation Inside a Null-Space Region and a Dc Magnetic Funnel for Achieving an Enhanced Magnetic Flux With a Large Gradient

Sun¹,

He²

2014

PIER

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Abstract-The idea of transformation inside a null-space region is introduced for the first time, and used to design a novel DC magnetic compressor that concentrates DC magnetic flux greatly and behaves as a DC magnetic funnel. The proposed device can be used as a passive DC magnetic lens to achieve an enhanced DC magnetic field (e.g., 7.9 times or more depending on the size and other parameters of the compressor) with a large gradient (e.g., 450 T/m or more) in free space. After some theoretical approximation, the proposed device can be easily constructed by using a combination of superconductors and ferromagnetic materials. Numerical simulations are given to verify the performance of our device. The proposed method (use a null-space region as the reference space) can be extended to reduce the material requirement when designing other devices with transformation optics.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Transformation Inside a Null-Space Region and a Dc Magnetic Funnel for Achieving an Enhanced Magnetic Flux With a Large Gradient

Sun¹,

He²

2014

PIER

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“…Besides using active magnets with extremely high power consumption to achieve stronger fields [6], we can use passive magnetic lenses or concentrators that can cause an external magnetic field to converge without consuming additional power to obtain enhanced DC magnetic fields in a specific region [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

EXPERIMENTAL REALIZATION OF STRONG DC MAGNETIC ENHANCEMENT WITH TRANSFORMATION OPTICS (Invited Paper)

Liu¹,

Jiang²,

Sun³

et al. 2014

PIER

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Abstract-A passive DC magnetic concentrator is designed with transformation optics (TO) and realized by meta-materials. The passive DC magnetic concentrator based on space compression transformation can greatly enhance the magnetic field in a free space region and can be used for e.g., improving the sensitivity of magnetic sensors and increasing the efficiency of wireless energy transmission. The magnetic property of the medium obtained by TO is extremely anisotropic. To solve this, we use magnetic metamaterials made of alternated high-permeability ferromagnetic (HPF) materials and high-temperature superconductor (HTS) materials. We optimize our structure by conducting simulations using the finite element method (FEM) and experimentally demonstrate a strong, 4.74-time enhancement of the DC magnetic field by our meta-material magnetic concentrator. We also demonstrate that a simplified structure with only HPF materials working at room temperature can still gives 3.84-time enhancement of the DC magnetic field. The experimental results are in good agreement with the numerical simulations based on FEM.

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“…There are two ways to achieve higher static magnetic field: one way is using some active magnet, which has a drawback of extremely high power consumption [7]. The other way is using passive magnetic lenses or concentrators that can cause an external magnetic field to converge without consuming additional power [8][9][10][11]. Our attention is focused on designing passive DC magnetic concentrators in this paper.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, many magnetic lenses based on superconductors have been designed and experimentally demonstrated [9][10][11]. However, magnetic lenses/concentrators based on purely superconductors have many disadvantages: refrigeration is required, the enhancement factor is very low, the region in which DC magnetic field is enhanced is very small, and the performance often degrades due to quenching and other factors.…”

Section: Introductionmentioning

confidence: 99%

Dc Magnetic Concentrator and Omnidirectional Cascaded Cloak by Using Only One or Two Homogeneous Anisotropic Materials of Positive Permeability

Sun¹,

He²

2013

PIER

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Abstract-A novel concentrator for static magnetic field enhancement is proposed and designed utilizing transformation optics. Compared with other devices for static magnetic field enhancement, our device has many good features: first, our concentrator can achieve a DC magnetic field enhancement in a relatively large free space with high uniformity. Secondly, our concentrator is composed by only one or two homogenous anisotropic materials with principal value greater than zero (without any infinitely large or zero value), which can be achieved by using currently available materials. Thirdly, the geometrical shape of the proposed device determines the enhancement factor and the permeability of the device. After choosing suitable geometrical parameters, we can obtain a concentration with a suitable enhancement factor and a material requirement that is easily achievable. The proposed concentrator will have many important applications in many areas (e.g., magnetic resonance imaging and magnetic sensors). Based on the same theoretical model, we also proposed a cascaded shielding device cloak for static magnetic fields. The proposed DC magnetic shielding device can be realized without using any material of zero permeability, and will have potential applications in, e.g., hiding a metallic object from being detected by a metal locator.

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Magnetic Flux Concentrator Using Gd-Ba-Cu-O Bulk Superconductors

Cited by 34 publications

References 6 publications

Transformation Inside a Null-Space Region and a Dc Magnetic Funnel for Achieving an Enhanced Magnetic Flux With a Large Gradient

Transformation Inside a Null-Space Region and a Dc Magnetic Funnel for Achieving an Enhanced Magnetic Flux With a Large Gradient

EXPERIMENTAL REALIZATION OF STRONG DC MAGNETIC ENHANCEMENT WITH TRANSFORMATION OPTICS (Invited Paper)

Dc Magnetic Concentrator and Omnidirectional Cascaded Cloak by Using Only One or Two Homogeneous Anisotropic Materials of Positive Permeability

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