The GEO 600 laser interferometer with 600m armlength is part of a worldwide network of gravitational wave detectors. GEO 600 is unique in having advanced multiple pendulum suspensions with a monolithic last stage and in employing a signal recycled optical design. This paper describes the recent commissioning of the interferometer and its operation in signal recycled mode.
We discuss the emission of gravitational waves from stellar collapse,with particular emphasis on the emission arising from convection above the surface of the proto-neutron star. We analytically estimate an upper limit to the gravitational wave emission from this convection. We also present results from the first 3-dimensional core-collapse simulations including realistic equations of state and neutrino physics and calculate the resultant gravitational wave signal from these collapse simulations. Convective overturns do not produce observable gravitational wave emission nor does this emission remove enough energy to effect the convective motions. But asymmetries in supernova are an almost certainty, and these asymmetries (possibly caused by rotation) will produce strong gravitational wave emission.
The GEO600 laser interferometric gravitational wave detector is approaching the end of its commissioning phase which started in 1995.
During a test run in January 2002 the detector was operated for 15 days in a power-recycled michelson configuration. The detector and environmental data which were acquired during this test run were used to test the data analysis code. This paper describes the subsystems of GEO600, the status of the detector by August 2002 and the plans towards the first science run.