Current Loop Decay in Rutherford-Type Cables

Akhmetov, A.A.; Devred, A.; Mint︠s︡, R. G.; Schermer, R.

doi:10.1007/978-1-4615-2439-7_106

Cited by 16 publications

(18 citation statements)

References 2 publications

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“…Once the current distribution is found, the magnetic moment of a cable per twist pitch is (11) and the loss per cycle per twist pitch is (12) where is the amplitude of the oscillating current .…”

Section: Ifmentioning

confidence: 99%

“…It is known that in nonuniform conditions the time constants of the flat cable can be very large [6]- [8], [11]. This is not the case when both the cable and applied magnetic field are uniform along the cable length.…”

Section: Time Constant Spectrummentioning

confidence: 99%

“…Allowing for the inter-cable insulation let us take 2 mm. For the value let us take first the lowest estimation based on the magnetic energy associated with one strand [11]. If 18 mm is the strand twist pitch, 1.07 mm is the strand diameter and 0.65 mm is the average diameter of the multi-filamentary area in the Alstom-made strand [12] then (28) Putting the above values in (28) we have 2.1 10 H. The average contact resistance in the inner windings of pre-series dipoles is 50 [13], which give us parameter 4800 m .…”

Section: Lhc Inner Cable Time Constant Estimationmentioning

confidence: 99%

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AC loss in a stack of flat superconducting cables

Akhmetov

2002

IEEE Trans. Appl. Supercond.

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Abstract-An equation has been derived which describes the current distribution in a flat cable subjected to a time-dependent magnetic field directed perpendicular to the cable wide face. Solutions of this equation obtained in the case when all parameters are uniform along the cable allow us to obtain the time constant spectrum, magnetic moment of the cable and A.C. loss. For a stack of cables with height much larger than the cable width, the contribution of the self-screening is calculated analytically. Numerical examples are provided based on geometrical characteristics and interstrand contact resistance of a typical LHC cable and the inductance of the LHC dipole.

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Section: Ifmentioning

confidence: 99%

Section: Time Constant Spectrummentioning

confidence: 99%

Section: Lhc Inner Cable Time Constant Estimationmentioning

confidence: 99%

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AC loss in a stack of flat superconducting cables

Akhmetov

2002

IEEE Trans. Appl. Supercond.

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“…Diffusion equations are as well used to describe the current loop decay 7 and the distribution of the transport current 8 in Rutherford-type cables at low and high excitation.…”

Section: Calculating Biccsmentioning

confidence: 99%

“…One example is given in Fig. 7 were the quench current of two magnets is depicted vs. the ramp rate 7 . For each magnet the quench current is shown for a direct ramp to quench and a ramp which is preceded by a ramp down at the same ramp rate (quench with precycle).…”

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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Superconducting Magnets for Particle Accelerators and Storage Rings

Devred¹

1999

Wiley Encyclopedia of Electrical and Electronics Engineering

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The sections in this article are Types of Particle Accelerator Particle Accelerators and Superconductivity Conductor and Conductor Insulation Magnetic Design Field Quality Mechanical Design Magnet Cooling Quench Performance Quench Protection Summary

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Current Loop Decay in Rutherford-Type Cables

Cited by 16 publications

References 2 publications

AC loss in a stack of flat superconducting cables

AC loss in a stack of flat superconducting cables

Review on Boundary-Induced Coupling Currents

Superconducting Magnets for Particle Accelerators and Storage Rings

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