Title :
Prototype of superferric quadrupole magnets for the BigRIPS separator at RIKEN
Author :
Kusaka, K. ; Kubo, T. ; Mizoi, Y. ; Yoshida, K. ; Yoshida, A. ; Tominaka, T. ; Yano, Y. ; Tsuchihashi, T. ; Kakutani, N. ; Sato, K.
Author_Institution :
Inst. of Phys. & Chem. Res., RIKEN, Saitama, Japan
fDate :
6/1/2004 12:00:00 AM
Abstract :
Three superferric quadrupoles with a pole-tip radius of 170 mm and a design field gradient of 14.1 T/m have been constructed and mapped for use as spectrometer elements. All three quadrupoles are assembled into a single cryostat and cooled by liquid-He bath cooling method. A small Gifford-McMahon/Joule-Thomson (GM/JT) cooler, mounted on the cryostat, requiries He gas that evaporates in the He vessel. The high-Tc superconducting current leads and radiation shield surrounding the He-vessel, cooled by a small GM cooler, reduce the heat load of the He vessel. Both cryocoolers operate using separate water-cooled compressors and allow us a stand-alone operation of the quadrupole magnets without big cryoplant. Results of quench protection tests, measured heat loads and mapped results are presented.
Keywords :
accelerator magnets; cryostats; cyclotrons; ion accelerators; liquid helium; magnetic cooling; materials testing; quenching (thermal); superconducting magnets; 170 mm; BigRIPS separator; Gifford-McMahon/Joule-Thomson cooler; He; He gas; He vessel; RIKEN Superconducting Ring Cyclotron; accelerator magnets; bath cooling method; cryocoolers; cryoplant; cryostat; heat load; liquid He; particle beam focusing; quench protection tests; radiation shield; spectrometer elements; superconducting current; superconducting magnets; superferric quadrupole magnets prototype; water-cooled compressors; Assembly; Compressors; Cooling; Helium; Particle separators; Protection; Prototypes; Spectroscopy; Superconducting magnets; Testing; Accelerator magnets; particle beam focusing; superconducting magnets;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2004.829102