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

Volume

19

Issue

3

fYear

2009

fDate

6/1/2009 12:00:00 AM

Firstpage

1307

Lastpage

1310

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;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2009.2019223

Filename

5109564