A) Beamline for spectroscopy of magnetic materials in the extreme ultraviolet spectral range
The extreme ultraviolet radiation (XUV) is generated in a standard gas (Ar, Ne, He) target. After a reflective XUV/IR beamsplitter the XUV light is focused by a toroidal mirror and circularly polarized by a 4-mirror reflective polarizer. We record a reference spectrum by diffracting the first order of a reflection grating by a in vacuum CCD camera. The 0 order is refocused by a second toroidal mirror onto the sampleto a spot size of approximately 100 µm FWHM. The transmitted or reflected light is collected by a flat field grating and collected by a second CCD camera. The two camera are synchronized and allow accurate and low noise measurements with an RMS ~ 1E-4. The sample environment includes an electromagnet to apply an external magnetic field of approximately 300 mT and a closed cycle, low vibration croystat for temperatures between ~10 K and 700 K.
Alternatively the polarization of the XUV beam can be controlled by a bi-circular pump field.
For a detailed overview please refer to a recent publication in Review of Scientific Instruments:
B) Beamline for coherent imaging and small angle scattering
By removing the switching mirror unit (SMU) the XUV beam is sent into a flexible vacuum chamber equipped with different monochromatizing focusing optics precise sample stages and a 4k in vacuum CCD camera.