Hannover 2010 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 35: Precision Measurements and Metrology IV

Q 35.6: Vortrag

Mittwoch, 10. März 2010, 17:45–18:00, A 310

Clock noise removal in the LISA mission — •Markus Otto, Gerhard Heinzel, and Karsten Danzmann — AEI Hannover (Max-Planck-Institut für Gravitationsphysik), Leibniz Universität Hannover

The detection of gravitational waves with the Laser Interferometer Space Antenna (LISA) in the 0.1 mHz - 1 Hz band is mainly disturbed by the laser phase noise. By Time Delay Interferometry (TDI), it is possible to remove this disturbance while the gravitational wave signal remains unchanged. For this, prompt and time-delayed signals are combined in a suitable way.

However, to synthesize those data stream combinations, the analog interferometer signal has to be transformed to a digital signal by an Analog Digital Converter (ADC). The ADC is driven by an extremely accurate clock (ultra stable oscillator, USO). This clock has inherent noise and thus introduces clock noise into the data streams. In our talk we will give a short overview of the clock noise problem and then discuss some possible solutions to cancel out the clock noise.