Deflection of weakly magnetic materials by superconducting OGMS

Boehm, J.; Gerber, R.; Fletcher, D.; Parker, Marina

doi:10.1109/20.11567

Cited by 15 publications

(5 citation statements)

References 2 publications

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“…r 1rsm where 2w is the width and 2h is the height of the thread; x rsm = x m − X rs , and z rsm = z m − Z rs . α 1rsm , α 2rsm , β 1rsm , β 2rsm , r 1rsm , r 2rsm , ρ 1rsm , and ρ 2rsm are defined by figure 4, [17].…”

Section: Magnetic Flux Density Calculationmentioning

confidence: 99%

Discrete Fourier transformation analysis of AC Hall sensor magnetometer measurements of high temperature superconductor tapes

Masti¹,

Lehtonen²,

Mikkonen³

2005

Supercond. Sci. Technol.

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During the last five years, the AC performance of high temperature superconductor (HTS) tapes has been under intense development due to the needs of practical applications. Previously, a system capable of measuring time dependent, spatial distribution of the magnetic flux density at a selected distance above the HTS tape has been presented. The tape can carry any cyclic current signal in the frequency range of 0-400 Hz. In this paper, a calculation model to extract information about the current densities, which create the measured magnetic flux density, is developed and used to interpret these measurements. Discrete Fourier transformation is found to provide a numerically stable method that is well suited to the interpretation of results and also for the signal noise exclusion. The third harmonic of the measured Hall voltage is seen to play an integral role in the comparison of the penetration models.

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Section: Magnetic Flux Density Calculationmentioning

confidence: 99%

Discrete Fourier transformation analysis of AC Hall sensor magnetometer measurements of high temperature superconductor tapes

Masti¹,

Lehtonen²,

Mikkonen³

2005

Supercond. Sci. Technol.

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“…The magnetic flux density can be obtained from an analytical twodimensional model where each coil is replaced with two long straight conductors. One conductor with the centre at (x 0i , y 0i ) produces the magnetic flux density B i in the point (x, y) [6]…”

Section: Problem Statementmentioning

confidence: 99%

Open gradient magnetic separation utilizing NbTi, Nb₃Sn and Bi-2223 materials

Ahoranta

Lehtonen

Mikkonen

2002

Supercond. Sci. Technol.

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Superconducting magnets enable the magnetic separation of particles with small magnetic susceptibility. In this paper, we compare superconducting separator magnets made of Nb3Sn, NbTi and Bi-2223 materials. The separator system is used to determine the optimal conditions for separation of various slurries. The magnet should provide a high and nearly constant magnetic force density. These requirements are met with racetrack coils. Geometries consisting of one or two racetracks have been examined. In order to keep the material costs at a reasonable level, the volume of the magnet has been minimized taking into account the constraints set by the force and current densities. Sequential quadratic programming (SQP) was used in the optimization procedure. The force density has been calculated using an analytical two-dimensional model. The critical current density of the coil was obtained by solving the magnetic flux density from a three-dimensional model using the finite element method. We have compared magnetic force densities and wire lengths in magnets made of different materials. For magnets made of low-temperature superconductors, the optimized geometry consisted of two coils. For magnets made of high-temperature superconductors, the minimum volume was achieved by using only one coil.

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“…Currently, the University of Twente is constructing a superconducting NbTi-based magnet system that will be installed in the first superconducting MDS demonstrator MDS set-up. The required magnetic field profile is different from other superconducting systems that have been developed for a variety of other separation systems, [3][4][5][6][7], and thus the optimum electromagnet configuration for MDS will also be different. Specifically, the gradient of the magnetic field strength should ideally by onedirectional, since field variations in multiple directions tend to re-mix the feed stream.…”

Section: Introductionmentioning

confidence: 98%

Optimum Coil-System Layout for Magnet-Driven Superconducting Magnetic Density Separation

et al. 2021

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This paper discusses the optimum layout of coils of a superconducting magnet system for Magnetic Density Separation (MDS). MDS is a novel separation technology that combines a vertical magnetic field gradient with a ferrofluid to separate mixtures of non-magnetic particles based on their mass density. The MDS process can separate more than two types of particles in a single process step, thereby distinguishing it from other separation techniques using a ferrofluid. The authors are currently constructing a superconducting MDS demonstrator. Ideally, the gradient of the magnetic field magnitude should change only with the distance above the magnet but remain constant in a horizontal plane.In principle, such an ideal field profile can be generated with an infinite harmonic sheet current. In practice, edge effects appear due to the necessity of using a finite number of coils. These cause a horizontal component in the field gradient and also change the vertical component. We compare the vertical magnetic field gradient of various coil layouts to see which configuration performs best. To facilitate ease of production, the analysis is restricted to flat racetrack coils. The main result is that the specific shape of a racetrack coil has a larger influence on the vertical gradient than the number of coils.The feed particles need to be pushed through the separation chamber from the insertion to the collection point. One option to realize this is to use an MDS set-up in which the magnet is inclined with respect to the horizontal plane. This tilting results in a horizontal magnetic force component, that drives feed particles through the fluid bed. We show that a three-coil layout provides the largest usable fluid bed depth for a wide range of tilt angles.

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Deflection of weakly magnetic materials by superconducting OGMS

Cited by 15 publications

References 2 publications

Discrete Fourier transformation analysis of AC Hall sensor magnetometer measurements of high temperature superconductor tapes

Discrete Fourier transformation analysis of AC Hall sensor magnetometer measurements of high temperature superconductor tapes

Open gradient magnetic separation utilizing NbTi, Nb₃Sn and Bi-2223 materials

Optimum Coil-System Layout for Magnet-Driven Superconducting Magnetic Density Separation

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Deflection of weakly magnetic materials by superconducting OGMS

Cited by 15 publications

References 2 publications

Discrete Fourier transformation analysis of AC Hall sensor magnetometer measurements of high temperature superconductor tapes

Discrete Fourier transformation analysis of AC Hall sensor magnetometer measurements of high temperature superconductor tapes

Open gradient magnetic separation utilizing NbTi, Nb3Sn and Bi-2223 materials

Optimum Coil-System Layout for Magnet-Driven Superconducting Magnetic Density Separation

Contact Info

Product

Resources

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Open gradient magnetic separation utilizing NbTi, Nb₃Sn and Bi-2223 materials