The superconducting strand for the CMS solenoid conductor

Author

Curé, B. ; Blau, B. ; Campi, D. ; Goodrich, L.F. ; Horvath, I.L. ; Kircher, F. ; Liikamaa, R. ; Seppälä, J. ; Smith, R.P. ; Teuho, J. ; Vieillard, L.

Author_Institution

Eur. Organ. for Nucl. Res., CERN, Geneva, Switzerland

Volume

12

Issue

1

fYear

2002

fDate

3/1/2002 12:00:00 AM

Firstpage

1014

Lastpage

1017

Abstract

The Compact Muon Solenoid (CMS) is one of the general-purpose detectors to be provided for the LHC project at CERN. The design field of the CMS superconducting magnet is 4 T, the magnetic length is 12.5 m and the free bore is 6 m. Approximately 2000 km of superconducting strand is under procurement for the conductor of the CMS superconducting solenoid. Each strand length is required to be an integral multiple of 2.75 km. The strand is composed of copper-stabilized multifilamentary Nb-Ti with Nb barrier. Individual strands are identified by distinctive patterns of Nb-Ti filaments selected during stacking of the monofilaments. The statistics of piece length, measurements of I_c, n-value, copper RRR, (Cu+Nb)/Nb-Ti ratio, as well as the results of independent cross checks of these quantities, are presented. A study was performed on the CMS strands to investigate the critical current degradation due to various heat treatments. The degradation versus annealing temperature and duration are reported.

Keywords

annealing; niobium compounds; particle calorimetry; position sensitive particle detectors; superconducting coils; 12.5 m; 2.75 km; 2000 km; 4 T; 6 m; CERN; CMS solenoid conductor; Compact Muon Solenoid; LHC project; Nb-Ti; annealing temperature; copper-stabilized multifilamentary; critical current degradation; filaments; free bore; heat treatments; magnetic length; monofilaments; superconducting strand; Collision mitigation; Conductors; Degradation; Detectors; Large Hadron Collider; Mesons; Multifilamentary superconductors; Solenoids; Superconducting filaments and wires; Superconducting magnets;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2002.1018572

Filename

1018572