The magnetic design and performance of the SRRC-U9 undulator

Author

Gottschalk, S.C. ; Quimby, D.C. ; Robinson, K.E.

Author_Institution

STI Optronics Inc., Bellevue, WA, USA

Volume

4

fYear

1999

fDate

1999

Firstpage

2677

Abstract

The magnetic design of the recently completed SRRC-U9 undulator system employs several enhancements to improve its performance. Side magnets to increase on-axis field augment the wedged-pole magnet geometry. Partial volume and partial strength end magnets and tuning bars achieve a zero-displacement, rapid turn-on, end-field configuration. Gap dependent normal and skew component ambient (earth) field compensation has been included in the design. The design includes bot active and passive end correction. Optical phase and trajectory shimming techniques have been employed to optimize performance. For k=10 the performance is greater than 80% of ideal through the seventh harmonic. At a K=6.4 the calculated spectral performance is greater than 80% through the thirteenth harmonic. A complete battery of magnetic measurements has fully established the field, spectral and beam dynamic characteristics of the undulator

Keywords

electron accelerators; permanent magnets; storage rings; wigglers; SRRC-U9 undulator; beam dynamic characteristics; magnetic design; magnetic performance; on-axis field; seventh harmonic; spectral performance; trajectory shimming techniques; wedged-pole magnet geometry; Degradation; Fabrication; Gaussian processes; Geometrical optics; Magnetic devices; Magnetic flux leakage; Magnets; Remanence; Saturation magnetization; Undulators;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1999. Proceedings of the 1999

Conference_Location

New York, NY

Print_ISBN

0-7803-5573-3

Type

conf

DOI

10.1109/PAC.1999.792901

Filename

792901