Problems or questions? Contact the webmaster!
The power recycling cavity (PRC) locks for a couple of seconds while the Michelson passes through fringes. This is possible because we have an electronic automatic gain control in the PRC control loop.
The PR mirror is misaligned, so the PRC cannot be used and we have only feedback to the intermediate mass of the triple pendulum suspension. The Michelson locks on a mid-fringe operation point (not the dark fringe).
Performance of the first GEO testrun! We want to test the data acquisition system and the long term behaviour of the whole system. So we obtain data sets for the detector characterization that were taken under well defined conditions.
The power-recycled Michelson locks for a few seconds on a dark fringe. The feedback was given to the electrostatic drive allowing to exert a force between the lowest mass of the reaction pendulum and the mirror itself.
The power-recycled Michelson locks for 30 minutes on a dark fringe with the feedback given to the electrostatic drive and the magnetic actuator at the intermediate pendulum stage.
Start of the test run of GEO 600, in coincidence with LIGO (Hanford and Livingston), in order to test the performance and stability of the system as well as the acquisition and exchange of data.