Sensor Noise in LISA Pathfinder: In-Flight Performance of the Optical Test Mass Readout
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Armano, M., E. Castelli, H. Audley, J. Baird, et al. “Sensor Noise in LISA Pathfinder: In-Flight Performance of the Optical Test Mass Readout.” Physical Review Letters 126, no. 13 (2021): 131103. https://doi.org/10.1103/PhysRevLett.126.131103.
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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract
We report on the first subpicometer interferometer flown in space. It was part of ESA’s Laser Interferometer Space Antenna (LISA) Pathfinder mission and performed the fundamental measurement of the positional and angular motion of two free-falling test masses. The interferometer worked immediately, stably, and reliably from switch on until the end of the mission with exceptionally low residual noise of 32.0 ⁺².⁴ ₋₁.₇ fm/√Hz, significantly better than required. We present an upper limit for the sensor performance at millihertz frequencies and a model for the measured sensitivity above 200 mHz.