X-ray optics and spectral brightness of the superconducting SRS wiggler

Abstract

The compact design of the SRS high field 3-pole wiggler magnet has the advantage that the synchrotron radiation power is emitted into a particularly large horizontal aperture (∼ 6°). By examining the various sources emitting radiation from the wiggler magnet and the adjacent dipole magnets, the total X-ray flux and the spectral brightness have been calculated. In particular the power distribution across the horizontal fan of radiation exhibits a prominent dip in the straight-on position where the only contribution comes from the central tangent point corresponding to the maximum wiggler field of 5 T. Elsewhere, because the horizontal separation between adjacent sources is least when they are of comparable intensity, the increase in integrated power and X-ray flux is translated into brightness giving values approximately twice those calculated for a single tangent point.