Development of high-strength and high-RRR aluminum-stabilized superconductor for the ATLAS thin solenoid

Author

Wada, K. ; Meguro, Sakae ; Sakamoto, H. ; Shimada, T. ; Nagasu, Y. ; Inoue, I. ; Tsunoda, K. ; Endo, S. ; Yamamoto, Akiyasu ; Makida, Y. ; Tanaka, K. ; Doi, Y. ; Kondo, T.

Author_Institution

Furukawa Electr. Co. Ltd., Japan

Volume

10

Issue

1

fYear

2000

fDate

3/1/2000 12:00:00 AM

Firstpage

373

Lastpage

376

Abstract

The ATLAS central solenoid magnet is being constructed to provide a magnetic field of 2 Tesla in the central tracking part of the ATLAS detector at the LHC. Since the solenoid coil is placed in front of the liquid-argon electromagnetic calorimeter, the solenoid coil must be as thin (and transparent) as possible. The high-strength and high-RRR aluminum-stabilized superconductor is a key technology for the solenoid to be thinnest while keeping its stability. This has been developed with an alloy of 0.1 wt% nickel addition to 5N pure aluminum and with the subsequent mechanical cold working of 21% in area reduction. A yield strength of 110 MPa at 4.2 K has been realized keeping a residual resistivity ratio (RRR) of 590, after a heat treatment corresponding to coil curing at 130/spl deg/C for 15 hrs. This paper describes the optimization of the fabrication process and characteristics of the developed conductor.

Keywords

aluminium alloys; cold working; copper alloys; niobium alloys; position sensitive particle detectors; solenoids; superconducting magnets; titanium alloys; yield strength; 110 MPa; 130 degC; 15 h; 4.2 K; ATLAS; Al-stabilized superconductor; CuNbTiAl; central solenoid magnet; cold working; curing; fabrication; heat treatment; high-strength; residual resistivity ratio; thin solenoid; yield strength; Aluminum alloys; Conductivity; Detectors; Large Hadron Collider; Magnetic fields; Nickel alloys; Solenoids; Stability; Superconducting coils; Superconducting magnets;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.828251

Filename

828251