CERN Accelerating science

Article
Title	Making an Inexpensive Electromagnetic Wiggler Using Sheet Materials for the Coils
Author(s)	Herman-Biallas, George ; Benson, S V ; Hiatt, Thomas ; Neil, George ; Snyder, Michael
Affiliation	(Jefferson Lab, Newport News, Virginia)
Publication	2004
In:	26th International Free Electron Laser Conference and 11th FEL User Workshop 2004, Trieste, Italy, 29 Aug - 3 Sep 2004, pp.e-proc. TUPOS60
Subject category	Accelerators and Storage Rings
Abstract	An inexpensive electromagnetic wiggler, made with twenty-eight, 4 cm periods with a K of 1 and gap of 2.6 cm was made within 10 weeks after receipt of order by an industrial machine shop. The coil design used sheet and plate materials cut to shapes using water jet cutting and was assembled in a simple stack design. The coil design extends the serpentine conductor design of the Duke OK4 to more and smaller conductors. The coils are conduction cooled to imbedded cooling plates. The wiggler features graded end pole fields, trim coil compensation for end field errors and mirror plates on the ends to avoid three dimensional end field effects. Details of the methods used in construction and the wiggler performance are presented.