Effect of Strand Damage in Nb3Sn Rutherford Cables on the Quench Propagation in Accelerator Magnets

Ruben Keijzer*, Gerard Willering, Marc Dhallé, Herman ten Kate

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

Accelerator magnets employing Nb3Sn Rutherford cables are more susceptible to conductor degradation than Nb-Ti magnets. Recent measurements on a Nb3Sn accelerator magnet have revealed unexpected behaviour such as decaying voltages at constant current plateaus of V-I measurements, inverse ramp rate and temperature dependence of quench currents, and anomalous quench propagation measured by so-called quench antennas. Numerical modelling has shown that these anomalies can be explained by an inhomogeneous degradation in the Rutherford cable, in which a subset of strands is fully or partially degraded. In this paper, we study how this type of degradation can affect the early stages of quench propagation. With the aid of a network model, we show how quench antenna signals can be used to diagnose inhomogeneous conductor degradation in the Rutherford cable.

Original languageEnglish
Article number4700605
JournalIEEE transactions on applied superconductivity
Volume33
Issue number5
DOIs
Publication statusPublished - 1 Aug 2023

Keywords

  • Accelerator magnets
  • NbSn
  • Quench
  • Rutherford cable

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