The Mechanics of the Vekmag Experiment

For the experiments at the synchrotron radiation source BESSY II synchrotron of the Helmholtz-Zentrum Berlin a new end station and a new beamline were developed and are now in user operation. The end station contains a 9-2-1 Tesla vectorial magnet and a cryostat with manipulator for the sample cooling and positioning, a deposition chamber, and a UHV detector chamber. We report here mainly on the technical design of the detector chamber which is placed below the magnet chamber and it is also connected to the deposition chamber. Because of various constrains including the limited available space between the bottom flange of the magnet chamber and the floor level, a sophisticated mechanics had to be developed to provide integrated functionality for both the detector holder and the sample transfer units. The detector unit consists of a tubular holder of 5 cm diameter which travels more than 60 cm vertically and exhibits an unlimited rotation degree of freedom of 360 degrees within the magnet bore. The sample transfer unit consists of a telescopic movement mechanism allowing for the sample holder vertical travel within the detector tubular holder. The functionality challenges and their resolve were addressed in an innovative mechanical design at HZB which was financed and build by the VEKMAG consortium.