On point-ahead angle control strategies for TianQin
arxiv(2024)
摘要
Pointing-related displacement noises are crucial in space-based gravitational
wave detectors, where point-ahead angle control of transmitted laser beams may
contribute significantly. For TianQin that features a geocentric concept, the
circular high orbit design with a nearly fixed constellation plane gives rise
to small variations of the point-ahead angles within ± 25 nrad in-plane and
± 10 nrad off-plane, in addition to a static bias of 23 μrad
predominantly within the constellation plane. Accordingly, TianQin may adopt
fixed-value compensation for the point-ahead angles and absorb the small and
slow variations into the pointing biases. To assess the in-principle
feasibility, the far-field tilt-to-length (TTL) coupling effect is discussed,
and preliminary requirements on far-field wavefront quality are derived, which
have taken into account of TTL noise subtraction capability in post processing.
The proposed strategy has benefits in simplifying the interferometry design,
payload operation, and TTL noise mitigation for TianQin.
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