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Interaction between stray electrostatic fields and a charged free-falling test mass.

F Antonucci1, A Cavalleri, R Dolesi

  • 1Dipartimento di Fisica, Università di Trento, and I.N.F.N., Gruppo di Trento, 38123 Povo (TN), Italy.

Physical Review Letters
|June 12, 2012
PubMed
Summary
This summary is machine-generated.

We measured electrostatic force noise affecting charged test masses, crucial for gravitational experiments. Our findings establish an upper limit for acceleration noise in the LISA mission, aiding future space-based observatories.

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Area of Science:

  • Experimental physics
  • Gravitational wave detection
  • Electrostatics

Background:

  • Stray electrostatic fields pose a significant challenge for precise gravitational experiments by introducing force noise.
  • Accurate measurement and mitigation of these fields are essential for the success of missions like LISA (Laser Interferometer Space Antenna).

Purpose of the Study:

  • To experimentally analyze force noise from stray electrostatic fields acting on a charged test mass.
  • To develop and validate an improved electrostatic model for measuring and nulling these fields.
  • To establish an upper limit on acceleration noise relevant to the LISA mission.

Main Methods:

  • Utilized two independent torsion pendulum techniques to measure electrostatic forces and their fluctuations.
  • Performed direct measurements of forces resulting from changes in electrostatic charge.
  • Integrated experimental data with an improved electrostatic model.

Main Results:

  • Quantified the average stray electrostatic field and its fluctuations affecting the test mass.
  • Demonstrated a method for measuring and nulling the stray field.
  • Established a conservative upper limit on acceleration noise of 2 (fm/s2)/Hz(1/2) above 0.1 mHz for stray field-charge interactions.

Conclusions:

  • The experimental analysis provides critical insights into managing electrostatic force noise in sensitive experiments.
  • The developed model and measurement techniques offer a pathway to mitigate interference in gravitational wave detectors.
  • The derived acceleration noise limit is directly applicable to the design and performance expectations of the LISA mission.