Thermo-elastic induced phase noise in the LISA Pathfinder spacecraft

F. Gibert, M. Nofrarias, N. Karnesis, L. Gesa, V. Martín, I. Mateos, A. Lobo, R. Flatscher, D. Gerardi, J. Burkhardt, R. Gerndt, D. I. Robertson, H. Ward, P. W. McNamara, F. Guzmán, M. Hewitson, I. Diepholz, J. Reiche, G. Heinzel, K. Danzmann

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


During the on-station thermal test campaign of the LISA Pathfinder, the 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 K Hz-1/2 in the frequency band 1-30 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 us 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 MHz-1/2, a factor of 30 below the measured noise at the lower end of the measurement bandwidth (1 MHz).

Original languageEnglish (US)
Article number045014
JournalClassical and Quantum Gravity
Issue number4
StatePublished - Feb 19 2015
Externally publishedYes


  • Gravitational waves
  • LISA Pathfinder
  • Laser interferometer
  • Low frequency
  • Temperature noise
  • Thermal diagnostics

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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