Quench propagation and protection analysis of the ATLAS Toroids

Author

Dudarev, A.V. ; Gavrilin, A.V. ; ten Kate, H.H.J. ; Baynham, D.E. ; Courthold, M.J.D. ; Lesmond, C.

Author_Institution

EP Div., CERN, Geneva, Switzerland

Volume

10

Issue

1

fYear

2000

fDate

3/1/2000 12:00:00 AM

Firstpage

365

Lastpage

368

Abstract

The ATLAS superconducting magnet system consists of the Barrel Toroid, two End Cap Toroids and the Central Solenoid. However, the Toroids of eight coils each are magnetically separate systems to the Central Solenoid. The Toroids are electrically connected in series and energized by a single power supply. The quench protection system is based on the use of relatively small external dump resistances in combination with quench-heaters activated after a quench event detection to initiate the internal dump of stored energy in all the coils. A rather strong quench-back effect due to eddy-currents in the coil casings at the transport current decay is beneficial for the quench protection efficiency in the event of heater failures. The quench behaviour of the ATLAS Toroids was computer simulated for normal operation of the quench protection system and its complete non-operation (failure) mode.

Keywords

overcurrent protection; position sensitive particle detectors; superconducting magnets; ATLAS; Barrel Toroid; Central Solenoid; End Cap Toroid; eddy-currents; quench protection; quench protection system; quench-back effect; superconducting magnet; Computational modeling; Event detection; Magnetic analysis; Magnetic separation; Power supplies; Power system protection; Solenoids; Superconducting coils; Superconducting magnets; Toroidal magnetic fields;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.828249

Filename

828249