Title :
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
fDate :
3/1/2002 12:00:00 AM
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;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2002.1018488
