Figure 2
Flux simulations from the SPECTRA code (Tanaka & Kitamura, 2001) using a 1.8 mm (horizontal) × 0.6 mm (vertical) rectangular slit placed 11.7 m from the center of the U20 undulator, equivalent to the GALAXIES fixed-aperture diaphragm location in the beamline front-end. The shaded area indicates the energy `hole' between the first and third harmonics. |