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The first space-based subpicometer interferometer, part of the Laser Interferometer Space Antenna (LISA) Pathfinder mission, successfully measured test mass motion. It demonstrated exceptional stability and reliability, achieving noise levels significantly below requirements.

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Area of Science:

  • Space instrumentation
  • Gravitational wave detection
  • Precision measurement

Background:

  • The Laser Interferometer Space Antenna (LISA) mission aims to detect gravitational waves using space-based interferometers.
  • Previous space-based interferometry faced challenges in achieving the required precision for detecting subtle gravitational wave signals.

Purpose of the Study:

  • To report on the performance of the first subpicometer interferometer flown in space.
  • To assess the interferometer's ability to measure the positional and angular motion of free-falling test masses.
  • To characterize the sensor's performance at millihertz frequencies.

Main Methods:

  • Deployment and operation of a subpicometer interferometer on ESA's LISA Pathfinder mission.
  • Measurement of the relative motion between two free-falling test masses in space.
  • Analysis of interferometer noise and sensitivity across a range of frequencies.

Main Results:

  • The interferometer operated immediately, stably, and reliably throughout the mission.
  • Achieved exceptionally low residual noise of 32.0_{-1.7}^{+2.4} fm/sqrt[Hz], surpassing mission requirements.
  • Established an upper limit for sensor performance at millihertz frequencies and modeled sensitivity above 200 mHz.

Conclusions:

  • The space-based subpicometer interferometer is a successful technology for precision measurement in space.
  • The achieved performance validates key technologies for future gravitational wave observatories like LISA.
  • The data provides valuable insights into sensor performance for future space-based scientific missions.