Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21722505b&link_type=abstract
American Astronomical Society, AAS Meeting #217, #225.05; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Proposals have been made recently for using two atom interferometers in gravitational wave sensors with a quite long two-way laser link between them (see e.g. S. Dimopoulos et al., Phys. Rev. D 78, 122002 (2008)). However, it appears that an important error source has been overlooked in such proposals. This error source involves the combined effects of laser wavefront aberrations and of the radial velocities of the atoms in the cooled atom clouds used in the interferometers. These errors can be due to jitter from measurement to measurement in either the wavefront aberrations themselves or in the radial velocities of the atoms in the clouds.
In the AGIS-Satellite 3 proposal of Dimopoulos et al., the distance between the two spacecraft used would be 10,000 km, and the calculated sensitivity limit due just to shot noise in detecting the final state of the atoms in the interferometers is 3x10-22/(Hz0.5) from 0.002 to 0.5 Hz. For a simplified model based only on primary spherical aberrations over 1 m diameter laser beams transmitted between the spacecraft and on 100 pK cloud temperatures, the extra noise would be equal to the calculated gravitational wave sensitivity for roughly the following disturbance levels: 2x10-6 wavelengths jitter in the aberration amplitude from second to second, or 0.1% fractional jitter in the rms radial atom velocities. However, the applicability of the model needs to be checked.
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