Fully superconducting rectifiers and fluxpumps Part 1: Realized methods for pumping flux

Klundert, L.J.M. van de; Kate, H. Ten

doi:10.1016/0011-2275(81)90195-8

Cited by 145 publications

(72 citation statements)

References 44 publications

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“…Superconducting flux pumps enable large currents to be injected into a superconducting magnet system without the requirement for copper current leads which bridge between the cryogenic environment and room temperature [1][2][3][4][5][6][7][8]. Previous works have already demonstrated mechanically rotating barrel-type flux pumps which employ a CC HTS stator and a rotor comprising arrays of rotating permanent magnets, and these flux pumps have been used to inject currents into HTS coils [3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

A Rotating Flux Pump Employing a Magnetic Circuit and a Stabilized Coated Conductor HTS Stator

Jiang¹,

Bumby²,

Badcock³

et al. 2016

Journal of Magnetics

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High temperature superconductor (HTS) magnet systems usually employ metal current leads which bridge between the cryogenic environment and room temperature. Such current leads are the dominant heat load for these magnet systems due to a combination of electrical resistance and heat conduction. HTS flux pumps enable large currents to be injected into a HTS magnet circuit without this heat load. We present results from an axialtype HTS mechanically rotating flux pump which employs a ferromagnetic circuit and a Cu-stabilized coated conductor (CC) HTS stator. We show the device can be described by a simple circuit model which was previously used to describe barrel-type flux pumps, where the model comprises an internal resistance due to dynamic resistance and a DC voltage source. Unlike previously reported devices, we show the internal resistance and DC voltage in the flux pump are not exactly proportional to frequency, and we ascribe this to the presence of eddy currents. We also show that this axial-type flux pump has superior current injection capability over barrel-type flux pumps which do not incorporate a magnetic circuit.

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Section: Introductionmentioning

confidence: 99%

A Rotating Flux Pump Employing a Magnetic Circuit and a Stabilized Coated Conductor HTS Stator

Jiang¹,

Bumby²,

Badcock³

et al. 2016

Journal of Magnetics

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“…The mechanism of this flux pump shows complete distinction from the conventional type-I superconducting flux pump, in which the flux migrates with the help of normal spots. 18 FIG. 3.…”

mentioning

confidence: 99%

Direct measurement of the vortex migration caused by traveling magnetic wave

Wang

Spaven

Zhang

et al. 2014

Applied Physics Letters

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We studied the magnetisation of a 2 in. diameter YBCO thin film in the presence of traveling magnetic waves with six hall sensors. Simulation based on finite element method was conducted to reproduce the process of magnetisation. We discovered that the magnetisation of YBCO thin film based on traveling waves does not follow the constant current density assumption as used in the standing wave condition. We have shown that the traveling wave is more efficient in transporting the flux into the YBCO thin film, which suggests the potential of a flux injection device for high temperature superconducting coils.

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“…Equation (4) shows that if the incremental current is very small then the current in the coil is expected to saturate. Taking the case of the coil starting at and , the first cycle would induce 3.2 A in the coil, according to (2). On the second time the pump is cycled through again, the coil starts at and the induced increment is 2.3 A and so now the coil has a new .…”

Section: The Flux Injectormentioning

confidence: 99%

“…However, the jointing of these HTS inserts may not yet match the persistence of their LTS counterparts and fortunately a flux injector offers a solution to stabilize the resistive decay of the NMR magnet. The purpose of a flux injector circuit is to introduce a current which would compensate for the drift in persistence [2].…”

Section: Introductionmentioning

confidence: 99%

Flux Injector for NMR Magnets

Lakrimi

Bircher

Dunbar

et al. 2007

IEEE Trans. Appl. Supercond.

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In circumstances where it is not possible to make perfectly persistent joints, it is not necessary to rework all the joints as a simple flux pump injector could be built with the magnet to stabilize the decay. This is particularly important in the case of NMR magnets where the magnetic field decay is of order 0.01 ppm/hr. This paper describes a flux pump which is used in the first instance to energize a coil to a very high current. In a second stage, the flux pump was used to periodically inject a small incremental current to the magnet and thus stabilize its decay.

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Fully superconducting rectifiers and fluxpumps Part 1: Realized methods for pumping flux

Cited by 145 publications

References 44 publications

A Rotating Flux Pump Employing a Magnetic Circuit and a Stabilized Coated Conductor HTS Stator

A Rotating Flux Pump Employing a Magnetic Circuit and a Stabilized Coated Conductor HTS Stator

Direct measurement of the vortex migration caused by traveling magnetic wave

Flux Injector for NMR Magnets

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