Quench propagation and magnet protection

Mess, Karl-Hubert

doi:10.1201/9781420050271.chc3

Cited by 2 publications

(1 citation statement)

References 8 publications

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“…Instabilities and disturbances of the superconducting coils when the magnet is powered [1], could cause the transition of the superconducting material to the normal resistive state and force the magnet discharge to prevent damage to the magnet. Even if the most important parameter for the quench protection is the delay time from the quench detection to the protection activation [2], also the location of the quench event is particularly interesting to evaluate if possible weak points of the superconducting coils are present in the magnet assembly. Considering superconducting magnets where the quench development is limited to one of the windings, the material which experienced the transition at the normal resistive state will not show a superconducting magnetization like the rest of the winding in the magnet.…”

Section: Introductionmentioning

confidence: 99%

Quench position reconstruction through harmonic field analysis in superconducting magnets

Mariotto

Sorbi

2021

Supercond. Sci. Technol.

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The performances of superconducting magnets for particle accelerators are limited by instabilities or disturbances which lead to the transition of the superconducting material to the normal resistive state and the activation of the quench protection system to prevent damage to the magnet. To locate the position of the state transition, voltage taps or quench antennas are the most commonly used technologies for their reliability and accuracy. However, during the production phase of a magnet, the number of voltage taps is commonly reduced to simplify the construction process and quench antennas are generally used only for dipoles or quadrupoles to limit the antenna design complexity. To increase the accuracy in the reconstruction of the quench event position, a novel method, suitable for magnets with independent superconducting coils and quench protected without the use of quench heaters, is proposed in this paper. This method, based on standard magnetic measurement techniques for field harmonic analysis, can locate the position of the superconductor transition inside the magnet after the quench event when the magnet has been discharged. Analyzing the not allowed harmonics produced in the field quality at zero current, the position of the quenched coils can be retrieved for any magnet orders without increasing the complexity of the dedicated measurement technique.

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Section: Introductionmentioning

confidence: 99%

Quench position reconstruction through harmonic field analysis in superconducting magnets

Mariotto

Sorbi

2021

Supercond. Sci. Technol.

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Protection of superconducting magnets

Schultz

2002

IEEE Trans. Appl. Supercond.

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The protection of superconducting magnets can be narrowly considered as the problem of rapidly detecting an irreversible loss of superconductivity (quench) and converting the magnetic stored energy to thermal energy (dump) without permanent damage (protection). It can also be broadly considered as a method for avoiding all structural and electrical failure mechanisms through design, fabrication, and operation of a magnet. Energy dump and quench detection methods are reviewed. General magnet failure is surveyed historically.

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Quench propagation and magnet protection

Cited by 2 publications

References 8 publications

Quench position reconstruction through harmonic field analysis in superconducting magnets

Quench position reconstruction through harmonic field analysis in superconducting magnets

Protection of superconducting magnets

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