Title :
Magnetic design of the Advanced Light Source elliptical wiggler
Author :
Marks, S. ; Akre, J. ; Hoyer, E. ; Humphries, U. ; Jackson, T. ; Minimihara, Y. ; Pipersky, P. ; Plate, U. ; Schlueter, R.
Author_Institution :
Lawrence Berkeley Lab., CA, USA
fDate :
7/1/1996 12:00:00 AM
Abstract :
An elliptical wiggler has been designed for installation in the Advanced Light Source at the Lawrence Berkeley Laboratory. The design has been optimized for the production of circularly polarized light in the 50 eV to 10 KeV energy range. The device will be 3.4 m long consisting of vertical and horizontal periodic structures. The period length for both is 20 cm. The vertical structure is a hybrid permanent magnet design which produces a peak field of 2.0 T. The horizontal magnetic structure is an iron core electromagnetic design shifted longitudinally by one-quarter period relative to the vertical structure; it has a peak field of 0.096 T. The polarity of the horizontal field can be switched at a rate of up to 1 Hz, which results in a modulation of the chirality of the circularly polarized radiation on-axis. This paper discusses the magnetic design and presents the results of radiation spectrum calculations used for determining optimal field parameter settings
Keywords :
X-ray production; accelerator magnets; electromagnetic wave polarisation; electromagnets; electron accelerators; permanent magnets; storage rings; wigglers; 0.095 T; 2.0 T; 50 eV to 10 keV; Advanced Light Source; chirality; circularly polarized light; elliptical wiggler; horizontal structure; hybrid permanent magnet; iron core electromagnet; magnetic design; periodic structure; radiation spectrum; vertical structure; Design optimization; Electromagnetic radiation; Iron; Laboratories; Light sources; Optical polarization; Periodic structures; Permanent magnets; Production; Undulators;
Journal_Title :
Magnetics, IEEE Transactions on
