Sensitivity investigation for unequal-arm LISA and TAIJI: the first-generation time-delay interferometry optimal channels

13 Aug 2020  ·  Wang Gang, Ni Wei-Tou, Han Wen-Biao ·

Three spacecraft of LISA/TAIJI mission follow their respective geodesic trajectories, and the arm lengths formed by the pairs of spacecraft are unequal due to solar system dynamics. Time delay interferometry is proposed to suppress the laser frequency noise raised by the unequal-arm-ness... By employing a set of numerical mission obit achieved from an ephemeris framework, we investigate the averaged sensitivity of the first-generation time-delay interferometry Michelson configuration and the corresponding optimal A, E, and T channels. We find that the sensitivity of the T channel is differing from the equal-arm case including the response function and the noise level, and its performance is sensitive to the inequality of the arm lengths. We also examine the laser frequency noise due to the mismatch of laser beam paths, and show that these channels are significantly subject to the laser frequency noise at their characteristic frequencies. read more

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General Relativity and Quantum Cosmology