Sensor Noise in LISA Pathfinder: In-Flight Performance of the Optical Test Mass Readout

• Published in: Physical review letters 2021-04, Vol.126 (13), p.131103-131103, Article 131103
• Main Authors: Armano, M., Audley, H., Baird, J., Binetruy, P., Born, M., Bortoluzzi, D., Brandt, N., Castelli, E., Cavalleri, A., Cesarini, A., Cruise, A. M., Danzmann, K., Silva, M. de Deus, Diepholz, I., Dixon, G., Dolesi, R., Ferraioli, L., Ferroni, V., Fitzsimons, E. D., Flatscher, R., Freschi, M., García, A., Gerndt, R., Gesa, L., Giardini, D., Gibert, F., Giusteri, R., Grimani, C., Grzymisch, J., Guzman, F., Harrison, I., Hartig, M.-S., Heinzel, G., Slutsky, J., Thorpe, J. I.
• Format: Article
• Language: English
• Subjects: Angular velocity; Earth Resources And Remote Sensing; Flight characteristics; Instrumentation and Detectors; LISA (antenna); Physics; Spacecraft Instrumentation And Astrionics
• ISSN: 0031-9007; 1079-7114
• DOI: 10.1103/PhysRevLett.126.131103

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.