Optics description

In the figure below, a schematic layout of the optical components of the BOREAS beamline is shown, both in a top and a side view. A detailed description of the functionality of the various optical elements is given in the Conceptual Design Report of the XMCD beamline.

In brief, the beamline consists of three sections:

1) the first section is composed by the plane and toroidal mirrors (PM and TM,
respectively). Their function is to absorb most of the heatload delivered from the
source and to prepare the beam for the monochromator, by focusing it in the
vertical plane (which is the dispersive plane of the monochromator) at the
entrance slit (and, in the horizontal plane, 2 m upstream the exit slit);

2) the second section consists of the monochromator: this is based on variable
line spacing (VLS) plane gratings (PGs), working at fixed included angle (175°
in combination with the spherical mirror SM1 or 177° in combination with the
spherical mirror SM2). The monochromator is equipped with both entrance and
exit slits and is dispersing in the vertical plane;

3) the third section comprises the refocusing optics, consisting of two bendable
mirrors arranged in a Kirkpatrick-Baez geometry, where the first mirror (PE1) is
vertically focusing, while the second mirror (PE2) is horizontally focusing. This
system allows one to focus the beam at either of the two experimental stations.

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