Title :
Design and Improvement of a Mini-Pole Superconducting Undulator at NSRRC
Author :
Jan, J.C. ; Hwang, C.S. ; Lin, P.H. ; Lin, F.Y.
Author_Institution :
Nat. Synchrotron Radiat. Center, Hsinchu
fDate :
6/1/2008 12:00:00 AM
Abstract :
The wire windings and magnetic performance of the mini-pole superconducting undulator (SCU) at the National Synchrotron Radiation Research Center (NSRRC) are being improved. NbTi superconducting (SC) wire with a rectangular cross section 0.51 mm 0.77 mm was wound on a racetrack iron pole. The designed field strength was 1.4 T at excitation current 510 A. The bath LHe-cryostat cools the SC wire directly and uniformly using LHe. A stainless-steel (SS) beam duct (thickness 0.3 mm) is designed to separate the ultra-high vacuum (UHV) from the storage ring and the LHe. The SS beam duct is glued to the dummy arrays with resin epoxy. The dummy arrays provide a strong support for the beam duct, providing against deformity from a pressure differential. A vacuum test was performed with a short version of a beam duct (length 400 mm) at low temperature. This paper describes the construction of the magnet, the measurement of the field and the testing of the SS beam duct.
Keywords :
accelerator magnets; cryostats; niobium alloys; stainless steel; storage rings; superconducting arrays; superconducting coils; superconducting magnets; synchrotron radiation; titanium alloys; type II superconductors; wigglers; winding (process); FeCCrJk; NSRRC; National Synchrotron Radiation Research Center; NbTi; NbTi superconducting wire; accelerator magnet; bath LHe-cryostat; current 510 A; designed field strength; dummy arrays; magnetic flux density 1.4 T; minipole superconducting undulator; racetrack iron pole; resin epoxy; size 0.3 mm; size 0.51 mm; size 0.77 mm; size 400 mm; stainless-steel beam duct; storage rings; ultra-high vacuum; vacuum test; Accelerator magnet; image current; racetrack coil; superconducting undulator;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2008.920598
