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

Volume

18

Issue

2

fYear

2008

fDate

6/1/2008 12:00:00 AM

Firstpage

427

Lastpage

430

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;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2008.920598

Filename

4519067