Increased Brownian force noise from molecular impacts in a constrained volume
arXiv:1107.2520 · doi:10.1103/PhysRevLett.103.140601
Abstract
We report on residual gas damping of the motion of a macroscopic test mass enclosed in a nearby housing in the molecular flow regime. The damping coefficient, and thus the associated thermal force noise, is found to increase significantly when the distance between test mass and surrounding walls is smaller than the test mass itself. The effect has been investigated with two torsion pendulums of different geometry and has been modelled in a numerical simulation whose predictions are in good agreement with the measurements. Relevant to a wide variety of small-force experiments, the residual-gas force noise power for the test masses in the LISA gravitational wave observatory is roughly a factor 15 larger than in an infinite gas volume, though still compatible with the target acceleration noise of 3 fm s^-2 Hz^-1/2 at the foreseen pressure below 10^-6 Pa.
4 pages, 5 figures
References in corpus (3)
Cited by in corpus (22)
- A micromechanical proof-of-principle experiment for measuring the gravitational force of milligram masses
- From laboratory experiments to LISA Pathfinder: achieving LISA geodesic motion
- Relative Acceleration Noise Mitigation for Nanocrystal Matter-wave Interferometry: Application to Entangling Masses via Quantum Gravity
- Gas damping force noise on a macroscopic test body in an infinite gas reservoir
- Non-interferometric test of the Continuous Spontaneous Localization model based on rotational optomechanics
- Gas-induced friction and diffusion of rigid rotors
- Space-borne Gravitational Wave Observatories
- Brownian force noise from molecular collisions and the sensitivity of advanced gravitational wave observatories
- In-depth analysis of LISA Pathfinder performance results: Time evolution, noise projection, physical models, and implications for LISA
- Design and characteristics of a WEP test in a sounding-rocket payload
- Mechanical dissipation below 1Hz with a cryogenic diamagnetic-levitated micro-oscillator
- Transient acceleration events in LISA Pathfinder data: properties and possible physical origin
- A New Torsion Pendulum for Gravitational Reference Sensor Technology Development
- Subtraction of temperature induced phase noise in the LISA frequency band
- Testing the Equivalence Principle in space after the MICROSCOPE mission
- Indirect Evidence for Lévy Walks in Squeeze Film Damping
- Differential optical shadow sensor for sub-nanometer displacement measurement and its application to drag-free satellites
- LAGRANGE: LAser GRavitational-wave ANtenna at GEo-lunar Lagrange points
- Inertial Torsion Noise in Matter-Wave Interferometers for Gravity Experiments
- Gas cooling of test masses for future gravitational-wave observatories
- Improved bounds on collapse models from rotational noise of LISA Pathfinder
- Space-based Gravitational Wave Observatories