Thermo-elastic induced phase noise in the LISA Pathfinder spacecraft

Abstract

During the On-Station Thermal Test campaign of the LISA Pathfinder the data and diagnostics subsystem was tested in nearly space conditions for the first time after integration in the satellite. The results showed the compliance of the temperature measurement system, obtaining temperature noise around $10^{-4}\mathrm{K}{\mathrm{Hz}}^{-1/2}$ in the frequency band of $1-30\mathrm{mHz}$. In addition, controlled injection of heat signals to the suspension struts anchoring the LISA Technology Package (LTP) Core Assembly to the satellite structure allowed to experimentally estimate for the first time the phase noise contribution through thermo-elastic distortion of the LTP interferometer, the satellite's main instrument. Such contribution was found to be at $10^{-12}\mathrm{m}{\mathrm{Hz}}^{-1/2}$, a factor of 30 below the measured noise at the lower end of the measurement bandwidth ($1\mathrm{mHz}$).

arXiv commentSubmitted to CQG

References in corpus (6)

• Thermal gradient-induced forces on geodetic reference masses for LISA
• Thermal diagnostic of the Optical Window on board LISA Pathfinder
• Digital laser frequency control and phase stabilization loops for a high precision space-borne metrology system
• Subtraction of temperature induced phase noise in the LISA frequency band
• Neural network interpolation of the magnetic field for the LISA Pathfinder Diagnostics Subsystem
• State-space modelling for heater induced thermal effects on LISA Pathfinder's Test Masses

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• Single-element dual-interferometer for precision inertial sensing
• Cascaded Multiparameter Quantum Metrology