Status of superconducting magnets for the Superconducting Super Collider

Schermer, R.

doi:10.1109/20.305565

Cited by 21 publications

(8 citation statements)

References 9 publications

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“…by introducing additional cooling channels, etc). Otherwise, the strong increase of the local losses could destroy the stability of magnets at considerably lower currents than expected [15].…”

Section: Resultsmentioning

confidence: 87%

AC losses and time constants of flat superconducting cables in inhomogeneous magnetic fields

Takács

1996

Supercond. Sci. Technol.

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We calculate the flux diffusion into flat superconducting cables in AC magnetic fields applied on some part of the cable. At low frequencies, the transverse losses inside the field region are enhanced due to currents induced outside this region, whereas the losses are negligible in field-free regions. At high frequencies, the two contributions are approximately the same, being of the same type as in normal conductors (skin effect). The time constant for decay of the induced current is proportional to the cable length and can be much larger than calculated for spatially homogeneous AC fields. This could explain the existence of long-living oscillatory currents (or 'super coupling currents') in some cables for accelerator magnets.

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Section: Resultsmentioning

confidence: 87%

AC losses and time constants of flat superconducting cables in inhomogeneous magnetic fields

Takács

1996

Supercond. Sci. Technol.

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“…Single layer coils are continuously hard bend wound with NbTi Rutherford type SSC [11] cable on an inner support cylinder, while outer collar rings are correspondingly mounted, section by section. After assembly, the rings are welded to each other, and the whole assembly is vacuum impregnated with epoxy to form a solid mechanical structure.…”

Section: Recirculating Beams In Hs Magnet Systemsmentioning

confidence: 99%

Superconducting Helical Solenoids for Muon Beam Cooling

Kashikhin

Andreev

Jansson

et al. 2008

IEEE Trans. Appl. Supercond.

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Novel configurations of superconducting magnets for helical muon beam cooling channels and demonstration experiments are being designed at Fermilab. The magnet system for helical cooling channels has to generate longitudinal solenoidal and transverse helical dipole and helical quadrupole fields. It was found that this complicated field configuration can be made by a helical solenoid, which is a set of circular coils shifted in transverse directions in such a way that their centers lay on the center of the helical beam orbit. This paper discusses the possibility of combining two such channels in one mechanical structure to allow beams of positive and negative muons to be cooled at the same time. The status of a short model helical solenoid prototype to study its magnetic and mechanical properties is also described.Index Terms-Helical solenoid, magnetic design, muon cooling, superconducting magnet system.

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“…Quench experiments on SSC dipole magnets showed that a number of magnets have a quench current that falls rapidly with increasing field sweep rate but then becomes almost constant (so called "type B" magnets) 27 . This effect is explained by the existence of large current loops or BICCs with long time constants, due to very low local contact resistances, e.g.…”

Section: C Decrease Of Magnet Stabilitymentioning

confidence: 99%

Review on Boundary-Induced Coupling Currents

Verweij

1998

Advances in Cryogenic Engineering Materials

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* LHC DivisionPresented at CEC/ICMC '97, Portland Boundary-Induced Coupling Currents (BICCs) are generated in multistrand superconducting cables during a field sweep if a) the field sweep and/or b) the electrical contacts between the strands of the cable vary along the cable. Typical parts in a coil which cause large BICCs are the connections between two cables in or outside a coil and the coil ends of racetrack magnets.In the first part of the paper several approaches for describing and calculating BICCs are reviewed. Attention is paid on the steady-state as well as the time dependent solutions.In the second part of the paper the consequences of BICCs on the behaviour of magnets are discussed. These are additional field variations along the magnet length, additional coupling losses and a non-uniform distribution of coupling losses and current among the strands, resulting in a reduced stability. Several effects are illustrated by means of measurements on model dipole magnets. It is shown how the additive effect of all the BICCs in a coil is rather unpredictable so that similar coils can have rather different BICC related behaviour.2

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Status of superconducting magnets for the Superconducting Super Collider

Cited by 21 publications

References 9 publications

AC losses and time constants of flat superconducting cables in inhomogeneous magnetic fields

AC losses and time constants of flat superconducting cables in inhomogeneous magnetic fields

Superconducting Helical Solenoids for Muon Beam Cooling

Review on Boundary-Induced Coupling Currents

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