Cooling structure for 6 T NbTi superconducting magnet directly cooled by cryocooler

Author

Yazawa, T. ; Koyanagi, K. ; Urata, M. ; Kuriyama, T. ; Ohtani, Y. ; Nomura, S. ; Maeda, H.

Author_Institution

Energy & Mech. Res. Lab., Toshiba Corp., Kawasaki, Japan

Volume

5

Issue

2

fYear

1995

fDate

6/1/1995 12:00:00 AM

Firstpage

181

Lastpage

184

Abstract

This paper describes the cooling structure for a 6 T NbTi superconducting coil directly cooled by a cryocooler. The cooling structure was designed to remove AC loss of the coil lest the coil temperature should exceed the current sharing temperature during coil charging. A copper cylinder surrounding the outer surface of the coil was adopted as the cooling structure. Indium sheet was inserted between the copper cylinder and the coil to improve thermal conductance. Stainless steel wire was wound on the copper cylinder so that the radial stress at the boundary between the copper cylinder and the coil was kept compressive. Temperature difference between the coil inner surface and the copper cylinder was lower than 0.1 K while charging the coil.<>

Keywords

cooling; cryogenics; superconducting coils; superconducting magnets; thermal conductivity; 6 T; AC loss; Cu; In; NbTi; NbTi superconducting magnet; coil charging; coil temperature; cooling structure; copper cylinder; cryocooler; current sharing temperature; direct cooling; indium sheet; radial stress; stainless steel wire; thermal conductance; Cooling; Copper; Indium; Niobium compounds; Superconducting coils; Superconducting magnets; Surface charging; Temperature; Thermal conductivity; Titanium compounds;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.402520

Filename

402520