NanoMAX Experimental Stations
NanoMAX is planned have two experimental stations when the main project phase ends 2018. Both stations will provide nano probes with foci in the 10-200 nm range. The two experimental stations are:
Experimental station for coherent X-ray diffraction imaging – CXDI
This experimental station is using KB-optics to focus x-rays to 200-50 nm in the full photon energy range. With a free distance of 100 mm between optics and sample versatile sample environments can be accommodated. A two axes goniometer will be used for flexible sample orientation. An articulated robot with a small pixel detector (512×512 pixels) will be used for off-axis Bragg measurements. A megapixel detector placed in forward direction will provide scattering methods e.g. diffraction, ptychography, and CDI. A scintillator camera will also be used in forward direction for various purposes. For X-ray fluorescence a 3-element Germanium detector will be used. Sample environments will be developed by user groups or in collaboration with user groups.
The CXDI station started operation in May 2017 with limited capabilities. A first user call was issued in January 2017 and until shutdown in July, 5 user groups were provided beamtime. In addition 3 external expert groups were involved in commissioning experiments. A second call for proposals opens August 7th covering the operation period from late 2017 to summer 2018.
Upper: CXDI experimental station during commissioning work May 2017. Lower left: Robot for detector positioning. Lower right: Merlin detector to be held by the robot.
Experimental station for tomographic imaging
The other experimental station will use Fresnel Zone Plates (FZPs) to provide focus down to 10 nm in a mature state. Main detectors will be: A large pixel detector in forward direction for diffraction and coherent imaging methods. A multi-element Silicon Drift Diode X-ray fluorescence detector for elemental mapping. Scanning stages will include XYZ motions and rotation around the vertical axis for tomographic methods. The station will not allow much sample flexibility due to extreme demands on stability and limited sample space. It will be build to operate in air. It is planned to provide in-vacuum, cryogenic capabilities in the future. The station is currently under development and prototyping and we anticipate to do the first tests during 2018.