Piezo-based Positioning for Magnetic Field Detection
X-rays, also referred as synchrotron radiation, serve as an important tool to observe the structure and dynamics of matter. The radiation is generated by bending magnets, wigglers or undulators. While bending magnet and wiggler radiation have a broader spectrum of photon energies, undulator generates narrow peaks, i.e. bright and coherent radiation at specific harmonics. This specific peak spectrum and defined photon energy is the main advantage of undulator radiation. Dr Carsten Kuhn and his group at the Helmholz-Zentrum in Berlin (Berlin, Germany) developed the new generation of undulators for the storage ring BESSY II. In order to optimize the resulting photon energy, the magnetic properties of cryogenic undulators need to be characterized precisely at different temperatures by movable Hall probes. Therefore, they designed a measurement slide with six attocube positioners to align the hall probe with respect to the undulators' magnets. With this precise analysing setup, the position accuracy of the Hall-probes is at least 5 μm and 20 μrad.
Laser Interferometry in Radiation Harsh Environments
attocube’s award winning FPSensor is now available with radiation hard sensor heads. Among the existing sensor portfolio, the “M12”sensor head has been qualified for the operation in radioactive environments at radiation doses of up to 10MGy.
The qualification process was conducted using a Co60 source and was succsefully tested by CERN and Fraunhofer Institute.
Vibration of high-power precision laser mirror
At the “ELI Beamlines facility”, currently under construction in Dolní Brežany close to Prague in the Czech Republic, we have developed an ultra-high pointing stability laser mirror mount for guiding the world’s highest repetition rate HAPLS Petawatt laser over up to 107 meters onto the target. The attocube IDS3010 offers major advantages compared to standard sensors like capacitive probes and accelerators when measuring 5 - 100 nrad RMS pointing stability of a mounted high-power precision laser mirror. While accelerometers may be used to measure mirror dummies for frequencies >≈12 Hz, the IDS3010 interferometer may diagnose contactless sub-nm displacements up to 10 MHz of mounted mirrors without risking the degradation of its laser damage threshold. In addition the IDS3010 sensor allows working distances up to a few meters. The software WAVE has proved to be convenient for visualizing in real-time the displacement data and for identifying resonant frequencies.
(Dr. Tomas Laštovicka, Dr. Martin Sokol, Dr. Michael Morrissey, Ing. Antonin Fajstavr, Dr. Stefan Borneis ELI-Beamlines, Dolní Brežany, CZ)