Experimental Platform

In order to align the experiment platform parallel to the beam, it is equipped with sufficient degrees of freedom. Furthermore, the sample is also be able to move along the beam direction. Alignment of the experiment chambers is realized by means of an external movement of the whole chamber.

Moving the UHV vessel

The UHV vessels sits on a large three-point support that gives access to all six degrees of freedom, which are however all coupled.

Drawing of the platform design to move the FFT vessel

platform shows the base of the platform. Three jacks fully define the position of the vacuum vessel in space. All three jacks can move in height. One jack can also move parallel to the beam, while the to others move perpendicular to the beam. In order to not over-define the position, the jacks have rails installed on their top that are free to move perpendicular to the motorized axes. This way, each jack defines two degrees of freedom, totalling six, thus defining fully the chamber’s position in space.

Moving the experimental platform

The experimental platform sits inside the UHV vessel on a Kelvin mount. While the height of all three points can be controlled from the outside of the vacuum chamber, only two lateral axes are movable this way. Inside the chamber, the sample can be moved along the beam, while a magnet can be moved in and out laterally, as shown in experimental-3d. The axis EP_YF sits on a cone, the axis EP_YBN sits on a flat, while axis EP_YBW is in the V-shape.

The motorized axes and their names of the experimental platform.

The Toyama’s center position are given in the following table from elog219. We later managed to have all motors in closed loop elog3201.

Axis	Encoder offset (mm)
EP_XF	48.26390
EP_XB	49.70150
EP_YF	46.80250
EP_YBW	46.66235
EP_YBH	45.71165
SAM_Z	40.85865
MAG_X	153.76900