The first mirror chamber is placed in the radioprotection hutch at about 20 meters from the source. The photon beam is first deflected by a plane mirror. Depending on the incidence angle it can follow two optical paths characterized by a deflection angle of 2 and 4 degrees. The bean is then reflected by a thoroidal mirror placed at 2 or 4 degrees for high and low energy photon respectively.

The Silicon mirrors are Pt coated and cooled to 100K by a closed circuit of high pressure liquid nitrogen.

The picture shows the three mirrors support inthe clean room during the mirror alignment. The copper tubes are le closed circuit for liquid nitrogen cooling.

Two slits are placed at the horizontal and vertical focal points of the toroidals mirrors. The transmitted intesity is used as a diagnostics of the extraction region (M1 mirrors) alignment. On the left you can see the intensity beam profile obtained scanning horizontally the position of a vertical slit 50 microns wide, placed before the gratings. It allow us to determine the correct alignment in the horizontal plane. The transmitted intensity presented on the right  is measured while scanning the opening of the entrance slit. The beam size depends on the photon energy, but when the alignment is good, more than 50% of the intensity is transmitted through the minimum slit width of 5 microns.