Title :
Commissioning Test of ATLAS End-Cap Toroidal Magnets
Author :
Dudarev, Alexey ; ten Kate, H.H.J. ; Buskop, J. ; Foussat, A. ; Benoit, P. ; Jeckel, M. ; Olyunin, A. ; Kopeykin, N. ; Stepanov, V. ; Deront, L. ; Olesen, G. ; Pons, X. ; Ravat, S. ; Sbrissa, E. ; Barth, K. ; Bremer, J. ; Delruelle, N. ; Metselaar, J. ; P
Author_Institution :
Eur. Center for Nucl. Res.-CERN, Geneva, Switzerland
fDate :
6/1/2009 12:00:00 AM
Abstract :
The system of superconducting toroids in the ATLAS experiment at CERN consists of three magnets. The Barrel Toroid was assembled and successfully tested in 2006. Next, two End-Cap Toroids have been tested on surface at 77 K and installed in the cavern, 100-m underground. The End Cap Toroids are based on Al stabilized Nb-Ti/Cu Rutherford cables, arranged in double pancake coils and conduction cooled at 4.6 K. The nominal current is 20.5 kA at 4.1 T peak field in the windings and the stored energy is 250 MJ per toroid. Prior to final testing of the entire ATLAS Toroidal system, each End Cap Toroid passed a commissioning test up to 21 kA to guarantee a reliable performance in the final assembly. In this paper the test results are described. It includes the stages of test preparation, isolation vacuum pumping and leak testing, cooling down, step-by-step charging to full current, training quenches and quench recovery. By fast discharges the quench detection and protection system was checked to demonstrate a safe energy distribution within the magnet after a quench or a triggered fast dump.
Keywords :
aluminium; copper; niobium alloys; position sensitive particle detectors; superconducting cables; superconducting coils; superconducting magnets; superconducting materials; titanium alloys; windings; ATLAS end-cap toroidal magnets; Al-NbTi-Cu; CERN; Rutherford cables; barrel toroid; commissioning test; current 20.5 kA; double pancake coils; end cap toroids; isolation vacuum pumping; leak testing; particle detector; protection system; quench detection; safe energy distribution; superconducting toroids; temperature 4.6 K; temperature 77 K; triggered fast dump; windings; Particle detector; superconducting magnet; toroid;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2009.2019223
