General lay-out

Click on the links below to go to the separate hutches

Id28 hut

Lay-out of the experimental and control hutches

OH3 | OH2 | EH1 | OH1 | Front End

The ID28 station comprises four experimental hutches and three control cabins. The first hutch (OH1) contains the primary slits, an attenuator filter unit, a set of collimating X-ray refractive lenses and the white-beam photon shutter and absorber (SS1). The undulator beam is then transferred through the Experimental hutch (EH1) in a lead enclosed vacuum tube (white-beam transfer line, WBTL) into OH2, where the high-heat load silicon (1,1,1) monochromator is located. The premonochromatised x-ray beam is then transferred via the monochromatic-beam transfer line (MBTL) to OH3 where the very high energy resolution backscattering monochromator and the focusing mirror is located. The x-ray beam, after backscattering from the monochromator is impinging on the mirror and deflected upwards. It travels back through the MBTL and OH2 into the Experimental hutch EH1, where the horizontally focusing multilayer and the IXS spectrometer is located. A monochromatic beam shutter (SS2) is installed in the backscattered beam path in OH2. This allows to keep all the optics under heat load, while still having access to the experimental hutch. Control cabin CC1 contains all the motor and electronics control and is the place from which the instrument is operated. CC2 provides preparation space for mounting and testing various sample environments, and CC3 hosts a small meeting room and an additional PC as a working and discussion place for users.

General optical lay-out

The optical lay-out is based on the triple-axis principle, composed of the very high energy resolution monochromator (first axis), the sample goniometry (second axis) and the crystal analyser (third axis). The figure below shows a schematic view of the optics and the distances involved. Due to the backscattering geometry the beamline is fairly long in order to acquire a sufficient beam offset between the incident photon beam from the X-ray source and the focused very high-energy resolution beam at the sample position.

Click on the links below to get detailed information on each element

Id28 opt

N.B: The collimating Be lens, the focussing Be lens and the post monochromator are optional instruments used only in specific cases.