Photons of higher energies are generated by the undulators and needs to be blocked before they reach the interaction point (IP).
The
More information about the HRM can be found here.
In additional to the fundamental wavelength, the generation of x-ray by electron electrons passing through undulators also produces higher order radiation (produces, in addition of the fundamental energy, radiation at integer multiple of the fundamental energy, called harmonics. Because of symmetry, only the odd orders in fact). For are allowed, so for example, for a fundamental at 5keV, photons at 15keV, 25keV, etc. are also generated.
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You can access motors relating to the HRM by clicking on the beamline related display (shown below).
More information about the HRM can be found here.