Analysis on the cryogenic stability and mechanical properties of the LHD helical coils

Author

Yanagi, Nagato ; Imagawa, Shinsaku ; Mito, Toshiyuki ; Gavrilin, Andrew V. ; Hamaguchi, Shinji ; Sekiguchi, Haruo ; Chikaraishi, Hirotaka ; Iwamoto, Akifumi ; Nishimura, Arata ; Nakamura, Yukio ; Satow, Takashi ; Motojima, Osamu

Author_Institution

Nat. Inst. for Fusion Sci., Gifu, Japan

Volume

12

Issue

1

fYear

2002

fDate

3/1/2002 12:00:00 AM

Firstpage

662

Lastpage

665

Abstract

Transient normal-transitions have been observed in the superconducting helical coils of LHD. Propagation of a normal-zone is analyzed with a numerical simulation code that deals with the magnetic diffusion process in a pure aluminum stabilizer. During excitation tests, a number of spike signals are observed in the balance voltage of the helical coils, which seem to be caused by mechanical disturbances. The spike signals are analyzed by applying pulse height analysis and the mechanical properties of the coil windings are investigated.

Keywords

accelerator magnets; colliding beam accelerators; mechanical properties; proton accelerators; storage rings; superconducting coils; superconducting magnets; synchrotrons; LHD; coil windings; cryogenic stability; helical coils; mechanical properties; pulse height analysis; spike signals; Aluminum; Cryogenics; Diffusion processes; Magnetic analysis; Mechanical factors; Numerical simulation; Signal analysis; Stability analysis; Superconducting coils; Superconducting magnets;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2002.1018488

Filename

1018488