The KB system is used in conjunction with the primary monochromator in OH1. These optics have large acceptance and thus provide excellent flux. They are susceptible to vibrational and thermal drifts, and both the angle and the bend must be tuned frequently when used for micro focussing applications.

The KB mirrors suffer from slow thermal drifts, and so a software feedback is used to keep them stable. The tank containing the mirrors is thermally isolated from the rest of the hutch and so is considerably less sensitive to the day/night thermal cycle. During tests the KB system at ID11 could be used to produce a focus which was entirely stable and a beam position which drifts by less than 5 microns.