Other
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aps..apr.j9002b&link_type=abstract
American Physical Society, April Meeting, 2004, May 1-4, 2004, Denver, Colorado April 2004, MEETING ID: APR04, abstract #J9.002
Other
Scientific paper
The Laser Interferometer Space Antenna (LISA) is being designed jointly by the European Space Agency and NASA for launch in 2011 or 2012. The instrumental sensitivity for periods longer than about 300 s will be limited mainly by spurious accelerations of the carefully isolated test masses that form the ends of the 5 million km long measurement paths. For periods less than about 3 hours, the requirement on the spurious test mass accelerations is that they be less than 3x10-15 m/s^2/sqrt Hz, and recent estimates indicate that they are likely to be roughly 3 times lower than this. At a frequency of 10 microhertz, or about one cycle/day, a few of the spurious acceleration sources get considerably worse. My estimates of the main noise sources, in units of 10-15 m/s^2/sqrt Hz, are as follows: a) Cosmic ray driven fluctuations in test mass charge, interacting with voltage differences from the test mass housing: 10; b) Thermally driven accelerations from solar variations: 6; c) Magnetic field fluctuations: 3; d) All other accelerations: 5. This gives a RSS total acceleration of 13, which would be consistent with a requirement of 15x10-15 m/s^2/sqrt Hz. It seems likely that the resulting sensitivity level would give valuable new information about massive black hole binary coalescences resulting from hierarchical merging of pre-galactic structures.
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