First undulators for the Advanced Light Source

Author

Hoyer, E. ; Akre, J. ; Chin, J. ; Gath, B. ; Humphries, D. ; Kincaid, B. ; Marks, S. ; Pipersky, P. ; Plate, D. ; Portmann, G. ; Schlueter, R. ; Hassenzahl, W.V.

Author_Institution

Lawrence Berkeley Lab., CA, USA

fYear

1993

fDate

17-20 May 1993

Firstpage

1572

Abstract

The first three undulators, each 4.6 m in length, for the Advanced Light Source (ALS) at Lawrence Berkeley Laboratory (LBL), are near completion and are undergoing qualification tests before installation into the storage ring. Two devices have 5.0-cm period lengths, 89 periods, and achieve an effective field of 0.85 T at the 14 mm minimum magnetic gap. The other device has a period length of 8.0 cm, 55 periods, and an effective field of 1.2 T at the minimum 14 mm gap. Measurements on the first 5 cm period device show the uncorrelated field errors to be 0.23%, which is less than the required 0.25%. Measurements of gap control show reproducibility of ±5 microns or better. The first vacuum chamber, 5.0 m long, is flat to within 0.53 mm over the 4.6 m magnetic structure section and a 4×10^-11 Torr pressure was achieved during vacuum tests. Device description, fabrication, and measurements are presented

Keywords

beam handling equipment; electron accelerators; storage rings; wigglers; Advanced Light Source; effective field; gap control; minimum magnetic gap; period lengths; qualification tests; storage ring; uncorrelated field errors; undulators; vacuum chamber; Fabrication; Laboratories; Light sources; Magnetic devices; Magnetic field measurement; Qualifications; Reproducibility of results; Storage rings; Testing; Undulators;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1993., Proceedings of the 1993

Conference_Location

Washington, DC

Print_ISBN

0-7803-1203-1

Type

conf

DOI

10.1109/PAC.1993.309074

Filename

309074