The U.S. NHMFL 60 T long pulse magnet

Author

Sims, James R. ; Schillig, Josef B. ; Boebinger, Gregory S. ; Coe, Hideyoshi ; Paris, Alan W. ; Gordon, Michael J. ; Pacheco, Michael D. ; Abeln, Terri G. ; Hoagland, Richard G. ; Mataya, Martin C. ; Han, Ke ; Ishmaku, Aferdita

Author_Institution

Nat. High Magnetic Field Lab., Los Alamos Nat. Lab., NM, USA

Volume

12

Issue

1

fYear

2002

fDate

3/1/2002 12:00:00 AM

Firstpage

480

Lastpage

483

Abstract

The 60 T long pulse magnet operated by the U.S. National High Magnetic Field Laboratory at Los Alamos National Laboratory, Los Alamos, New Mexico failed catastrophically on July 28, 2000. The failure was investigated and the cause was determined to be unusually low toughness in the nitrogen strengthened manganese stainless steel (Nitronic-40™) reinforcing material. The source of the reduced toughness condition was a sigma phase conversion in the microstructure. The magnet failure, failure investigation and results of the investigation are described. Plans for the construction of the successor magnet, the 60 tesla long pulse Mark II, are described.

Keywords

brittle fracture; electromagnets; embrittlement; solenoids; stainless steel; 60 T; FEA; Nitronic-40; brittle sigma phase; catastrophic failure; dewar walls; ductile rupture; embrittlement; long pulse magnet; low toughness; magnet failure; nitrogen strengthened manganese stainless steel; sigma phase conversion; stainless steel reinforcing material; Coils; Laboratories; Magnetic field measurement; Magnetic fields; Manganese; Nitrogen; Power supplies; Pulse measurements; Pulsed power supplies; Steel;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2002.1018447

Filename

1018447