Speaker
Mr
Emmanuele Ravaioli
(Twente Technical University (NL))
Description
The recently developed Coupling Loss Induced Quench (CLIQ) protection system is a new method for initiating a fast and voluminous transition to the normal state for protecting high energy density superconducting magnets. Upon quench detection, CLIQ is triggered to generate an oscillating current in the magnet coil by means of a capacitive discharge. This in turn introduces high coupling loss in the superconductor which provokes a quick transition to normal state of the coil windings. CLIQ is now implemented for the protection of a two meter long superconducting quadrupole magnet and characterized in the CERN magnet test facility. Various CLIQ configurations with different current injection points are tested and the results compared to similar transients lately measured with a not optimized configuration. Test results convincingly show that the newly tested design allows for a more global quench initiation and thus a faster discharge of the magnet energy. Moreover, the performance of CLIQ for reducing the hotspot temperature after a quench is compared to that of conventional quench heaters. In addition, measured transients are reproduced using a lumped element dynamic electrothermal model developed with Simulink©. After its validation, the model is now used for simulating various discharges in order to find the optimum CLIQ configuration and operating parameters for the most homogeneous transition to the normal state of the coil windings and hence the lowest hotspot temperature. Finally, the integration of the new CLIQ with conventional protection systems like quench heaters and energy extraction is thoroughly discussed for incompatibilities and synergies.
Author
Mr
Emmanuele Ravaioli
(Twente Technical University (NL))
Co-authors
Arjan Verweij
(CERN)
Glyn Kirby
(CERN)
Herman ten kate
Kevin Ashley Sperin
(U)
Michal Maciejewski
(University of Lodz (PL))
Vladimir Ivanovich Datskov
(Dipartimento di Fisica-Universita degli Studi di Perugia-Univer)
