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- W2170148821 abstract "In case of a quench in one of the main dipoles and quadrupoles of CERN's Large Hadron Collider (LHC), the magnet has to be protected against excessive temperatures and high voltages. In order to uniformly distribute the stored magnetic energy in the coils, heater strips installed in the magnet are fired after quench detection. Tests of different quench heater configurations were performed on various 1 m long model and 15 m long prototype dipole magnets, as well as on a 3 m long prototype quadrupole magnet. The experiments aimed at optimising the layout of the quench heater strips, minimising the complexity of the protection system and determining its redundancy. In this paper we discuss the results of the performed experiments and describe the optimised quench heater design for the LHC main magnets. 1 PROTECTION SCHEME In the Large Hadron Collider at CERN 1232, 15 m long dipole magnets and 392, 3 m long quadrupole magnets will be powered with a current of up to 13 kA. Each of the eight sectors of the machine is powered independently to limit the amount of the stored energy in the main electrical circuits, with 154 magnets for the dipoles, and 47 or 51 magnets for the quadrupole circuits. In case of a resistive transition (quench), heaters are fired to initiate enough resistive volume that the energy can be safely dissipated in the coils, keeping maximum temperatures and voltages within safe limits. Every magnet is de-coupled from the rest of the circuit using a cold by-pass diode, and the resistive voltage across the magnet provokes a fast commutation of the current from a quenching magnet to its parallel diode. The magnet chain is de-excited by opening switches across a dump resistor, in which the energy stored in the remaining superconducting magnets will be dissipated. Because of the large values of the inductance, de-excitation is slow (time constants of about 100 seconds for dipole circuits, and of about 50 seconds for quadrupole circuits) (1)." @default.
- W2170148821 created "2016-06-24" @default.
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- W2170148821 date "2000-09-23" @default.
- W2170148821 modified "2023-10-03" @default.
- W2170148821 title "QUENCH HEATER EXPERIMENTS ON THE LHC MAIN SUPERCONDUCTING MAGNETS" @default.
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