Sensitivity of the low frequency facility experiment around 10 Hz

The reduction of thermal noise is a fundamental issue for the improvement of future gravitational wave antennas. The main purpose of the Low Frequency Facility (LFF) is to study pendulum thermal noise in the region of 10 Hz. Data at the LFF has been taking since the beginning of 2003 and has been analyzed in order to thoroughly understand the region around 10 Hz. Above 7 Hz. the displacement noise floor is at the level of 10(-14) m/rootHz, decreasing with frequency approximately as 1/v. Seismic noise contamination is not observed above a few Hz. (C) 2004 Elsevier B.V. All rights reserved.