Freiburg 2008 – scientific programme
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GR: Fachverband Gravitation und Relativitätstheorie
GR 8: Gravitationswellen
GR 8.2: Talk
Wednesday, March 5, 2008, 17:05–17:25, KGI-HS 1010
Data analysis pipeline of the spherical gravitational wave detector MiniGRAIL — •Carlos Filipe Da Silva Costa1, Stefano Foffa2, Michele Maggiore2, Martin Pohl1, and Riccardo Sturani2 — 1DPNC, Université de Genève, CH-1211 Genève 4 — 2DPT, Université de Genève, CH-1211 Genève 4
MiniGRAIL (GRavitational Antenna In Leiden) is a spherical resonant mass of 68cm diameter made of CuAl. First measurements have been obtained with three transducers (DROS) at a thermodynamic temperature of 5K. In the future, the detector will operate at 50mK with six transducers allowing a reconstruction of the gravitational wave direction. The GW sensitive spheroidal quadrupole modes have a frequency around 2980 Hz.
We are currently preparing the data analysis pipeline. We exploit the multi-mode capabilities of the sphere applying our knowledge of single-channel resonant detectors data analysis. First, we convert the current signal from the six transducers output into six quadrupolar modes h_m (including the scalar one). Then the modes are processed by means of the wavelet analysis and filtered via matched filtering. From the list of events generated for each mode, we look for coincidences and produce a list of candidate events. For each candidate event, we estimate the arrival direction and check if the event has the transverse geometry of a gravitational wave.
For compatibility, our pipeline is developed in C++ and results are saved in the frame format used by Ligo and Virgo.