KB_scheme

 

A compact Kirkpatrick-Baez mirror system (KB) has been specially designed at ESRF in 2006 for the ID21 SXM-II. The same concept is used for the two new KB in the nano-SXM. These KBs are based on elliptically shaped, fixed-focus mirrors. They achieve a spot size of ~0.35 x 0.7µm2 in the SXM-II and ~0.130 x 0.130 µm² in the nano-SXM. The compact design of these KB ensures high mechanical and thermal stability, and a short focal length which allows a high source demagnification. The advantages of the KB configuration are its higher photon flux and its achromaticity which is preferable for µXANES.