Physics
Scientific paper
Mar 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aps..apr.d8006b&link_type=abstract
American Physical Society, APS April Meeting 2012, March 31-Apr 3, 2012, abstract #D8.006
Physics
Scientific paper
In late 2011, suggestions were made of two new atom interferometry mission concepts for gravitational wave studies. [A presentation by B. N. Saif on these concepts is available on the NASA Physics of the Cosmos website under ``Workshop on Gravitational Wave Mission Architectural Concepts'' (Dec. 20-21, 2011)]. The concepts were for measurements between atom clouds separated by distances of L=500 m or L=500 km. At GW frequencies of 0.1 to 10 Hz, sinusoidal variations in the separations dX between two parts of the atom wavefunctions would be induced by motion of the nulls in the optical potential, using the Bloch oscillation approach. But some apparent limitations of this approach are as follows: the S/N required for achieving the strain sensitivities shown appears to be much higher than the value given in the example in the presentation; the large sinusoidal variations required in the control laser frequency make it difficult to use high finesse cavity mode-cleaners to reduce the effects of laser wavefront aberration fluctuations; very small fluctuations in the temperature or size of the atom clouds would cause serious additional noise, particularly for the L=500 m case; and for the L=500 mission concept, the 10-20 W suggested laser power does not seem to permit keeping the spontaneous emission rate low. However, the main issue is that the required atom interferometry systems appear to be far more complex than the gravitational reference sensors that they would replace.
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