FFT: The Forward Scattering Fixed Target Chamber¶
The forward-scattering fixed-target (FFT) chamber hosts the coherent diffraction imaging experiments, which are the baseline experimental studies to be performed at the SCS instrument. In the initial design, a forward-scattering geometry has been considered. Furthermore, the sample environment has to allow changing samples without breaking the vacuum. The latter is realized by means of a fast sample changer system connected to a load lock.
A cubic chamber with an outer dimension of 500 mm and a height of 700 mm is the base of end experiment station. The cubic shape was chosen to provide enough space to allocate a linear stage for the sample movement as well as THz in-coupling mirrors and diagnostic tools. The linear stage and the mirrors sit on top of a bread board that separates the chamber into two parts (upper and lower part). This configuration improves accessibility during installation and commissioning. An additional advantage of the cubic shape is that it allows to minimize the sample to detector distance. The 700 mm height is mainly determined by the flange (DN 350) for the DSSC detector.
There is extensive documentation on the
mechanics.
The motorized axes and their names of the experimental platform. Extracted from experimental platform file.
The clearance mechanism to move the steel frame with respect to the inner experimental platform is partly described in clearance mechanism file.