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J Synchrotron Radiat. 2008 Jul;15(Pt 4):335-40. doi: 10.1107/S0909049508008418. Epub 2008 May 8.

Comparison of calculated brightness and flux of radiation from a long-period wiggler and a short-period undulator.

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  • 1National Synchrotron Light Source, Brookhaven National Laboratory, Upton, NY 11973, USA.


In this article the calculation of brightness and flux for two insertion devices of the 2.8 GeV X-ray storage ring at the NSLS is discussed. The radiation properties from the X25 linearly polarized wiggler and the new X25 short-period undulator are compared at a fixed photon energy (11.3 keV) corresponding to emission from the fifth harmonic of the short-period undulator. For this computation, three commonly available synchrotron radiation programs are used. The capabilities of each of these codes are briefly discussed, and their range of applicability are commented on. It is concluded that special care is needed when modeling the radiation of the classes of insertion devices considered here.

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