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1999•IEEE Transactions on Applied SuperconductivityOpen access

Tests of a 70 mm aperture quadrupole for the LHC low-beta insertions

M.J. Lamm, G. Kirby, R. Ostojić, F. Rival, F. Rodríguez-Mateos, A. Siemko, T. Taylor, L. Walckier, S. Milward, J.R. Treadgold

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Abstract

Three 70 mm aperture 1-meter superconducting quadrupole magnets for the LHC low-/spl beta/ insertions have been designed and built in collaboration between CERN and Oxford Instruments. These magnets feature a four layer coil wound from two 8.2 mm wide graded NbTi cables. In this paper, the authors present the results from the tests at 4.4 K and 1.9 K of the third quadrupole (Q3), with an emphasis on studies concerning quench protection. After a summary of Q3 training in three thermal cycles, quench velocities, peak temperatures in the two superconducting cables and the performance of the layer strip heaters are reported.

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Three 70 mm aperture 1-meter superconducting quadrupole magnets for the LHC low-/spl beta/ insertions have been designed and built in collaboration between CERN and Oxford Instruments. These magnets feature a four layer coil wound from two 8.2 mm wide graded NbTi cables. In this paper, the authors present the results from the tests at 4.4 K and 1.9 K of the third quadrupole (Q3), with an emphasis on studies concerning quench protection. After a summary of Q3 training in three thermal cycles, quench velocities, peak temperatures in the two superconducting cables and the performance of the layer strip heaters are reported.

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Available abstract

Three 70 mm aperture 1-meter superconducting quadrupole magnets for the LHC low-/spl beta/ insertions have been designed and built in collaboration between CERN and Oxford Instruments. These magnets feature a four layer coil wound from two 8.2 mm wide graded NbTi cables. In this paper, the authors present the results from the tests at 4.4 K and 1.9 K of the third quadrupole (Q3), with an emphasis on studies concerning quench protection. After a summary of Q3 training in three thermal cycles, quench velocities, peak temperatures in the two superconducting cables and the performance of the layer strip heaters are reported.

Key concepts: Large Hadron Collider, Quadrupole magnet, Superconducting magnet, Niobium-tin, Magnet, Electromagnetic coil, Quadrupole, Aperture (computer memory)

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