Mini-pole Superconducting Undulator for X-Ray Synchrotron Light Source

Author

Hwang, C.S. ; Jan, J.C. ; Lin, P.H. ; Chang, C.H. ; Huang, M.H. ; Lin, F.Y. ; Fan, T.C. ; Chen, H.H.

Author_Institution

Inst. of Nat. Synchrotron Radiat. Res. Center, Hsinchu

Volume

16

Issue

2

fYear

2006

fDate

6/1/2006 12:00:00 AM

Firstpage

1855

Lastpage

1858

Abstract

A mini-pole planar vertically-wound racetrack coil undulator was studied to determine its potential for use as a hard X-ray source in a 3 GeV storage ring. A field strength of 1.4 T can be obtained for a superconducting undulator with a periodic length of 1.5 cm and a fixed magnetic gap of 5.6 mm. The magnetic circuit was optimized and a current density of 1090 A/mm², at 80% of the critical current, meets the field strength requirement. A prototype with 40 poles was constructed to verify the design of the magnet and the performance of NbTi superconductor. Additionally, the magnetic field shimming method was developed for spectrum shimming. This study discusses the design of the magnetic circuit and the structure of the magnetic array, the field shimming technique, and the test results of the prototype magnet

Keywords

accelerator magnets; critical current density (superconductivity); storage rings; superconducting coils; superconducting magnets; synchrotrons; wigglers; 1.4 T; 1.5 cm; 3 GeV; NbTi; critical current; current density; field strength; hard X-ray synchrotron light source; image current; magnetic array structure; magnetic circuit design; magnetic field shimming method; magnetic gap; minipole planar vertically-wound racetrack coil undulator; minipole superconducting undulator; prototype magnet; spectrum shimming; storage ring; Circuit testing; Current density; Light sources; Magnetic circuits; Prototypes; Storage rings; Superconducting coils; Superconducting magnets; Synchrotrons; Undulators; Image current; magnetic field shimming; racetrack coil; superconducting undulator;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2006.871236

Filename

1643226