Control of the fields due to superconductor magnetization in the SSC magnets

Green, M.

doi:10.1109/tmag.1987.1064885

Cited by 22 publications

(8 citation statements)

References 4 publications

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“…There were considered introduction of passive superconducting strands [1] or nickel tapes [2] inside the coil aperture, nickel powder inside the strands [3] and permanent magnets [4] for the reduction of the persistent current effect. However, due to their complexity and low efficiency none of the proposed techniques found practical implementation in existing accelerators.…”

Section: Introductionmentioning

confidence: 99%

Passive correction of the persistent current effect in Nb/sub 3/Sn accelerator magnets

Kashikhin

Barzi

Chichili

et al. 2003

IEEE Trans. Appl. Supercond.

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Superconducting accelerator magnets must provide a uniform field during operation. However, the field quality significantly deteriorates due to persistent currents induced in superconducting filaments. This effect is especially large for the Nb 3 Sn conductor being implemented in the next generation of accelerator magnets. A simple and inexpensive method of passive correction of the persistent current effect was developed and experimentally verified. This paper describes numerical simulations of the passive correctors and reports the test results.

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Section: Introductionmentioning

confidence: 99%

Passive correction of the persistent current effect in Nb/sub 3/Sn accelerator magnets

Kashikhin

Barzi

Chichili

et al. 2003

IEEE Trans. Appl. Supercond.

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“…By adding ferromagnetic elements to the cross-section, the field error at low energization can be compensated without influencing the field quality at higher levels. This concept was proposed in [11] and studied in detail by others also (e.g. [12]).…”

Section: A Passive Compensation Methodsmentioning

confidence: 99%

2D Magnetic Design and Optimization of a 88-mm Aperture 15 T Dipole for NED

Schwerg

Vollinger

Devred

et al. 2007

IEEE Trans. Appl. Supercond.

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Abstract-The Next European Dipole (NED) activity supported by the European Union aims at the development of a high-performance Nb 3 Sn conductor ( c = 1500 A mm 2 @ 15 T, 4.2 K) in collaboration with European industry and at the design of a highfield dipole magnet making use of this conductor. In the framework of the NED collaboration which coordinates the activity of several institutes, CERN has contributed to the electromagnetic design study of a cos , layer-type superconducting dipole with an 88 mm aperture that is able to reach 15 T at 4.2 K. Part of the optimization process was dedicated to the reduction of the multipole coefficients so as to improve field quality while keeping an efficient peak-field to main-field ratio. In this paper, we present the optimization of the coil cross-section and of the shape of the iron yoke to reduce saturation-induced field errors during ramp. The effects of persistent magnetization currents are also estimated and different methods to compensate persistent-current-induced field distortions are presented.Index Terms-High field dipole magnet, iron yoke saturation, Nb 3 Sn, persistent magnetization currents.

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“…Wires of ferromagnetic material (nickel, mu metal or iron) can be inserted into the inside of the magnet bore 13 or into one of the magnet wedges 27. In :he NC-9 coil cross-section, the second wedge from the magnet midplane was attractive. In the DX-201 cross-section, the second wedge is close to the correct angle with respect to the midplane, so this method of correction is probably possible.…”

Section: Correction With Ferromagnetic Wires and Passive Superconductmentioning

confidence: 99%

An update on passive correctors for the SSC dipole magnets

Green¹

1991

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Control of the fields due to superconductor magnetization in the SSC magnets

Cited by 22 publications

References 4 publications

Passive correction of the persistent current effect in Nb/sub 3/Sn accelerator magnets

Passive correction of the persistent current effect in Nb/sub 3/Sn accelerator magnets

2D Magnetic Design and Optimization of a 88-mm Aperture 15 T Dipole for NED

An update on passive correctors for the SSC dipole magnets

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