Journal
PHYSICAL REVIEW D
Volume 81, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.81.021101
Keywords
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Funding
- GSFC [NAS5-03075]
- NASA [NNG05GF74G]
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Accumulation of electrical charge on the end mirrors of gravitational-wave observatories can become a source of noise limiting the sensitivity of such detectors through electronic couplings to nearby surfaces. Torsion balances provide an ideal means for testing gravitational-wave technologies due to their high sensitivity to small forces. Our torsion pendulum apparatus consists of a movable plate brought near a plate pendulum suspended from a nonconducting quartz fiber. A UV LED located near the pendulum photoejects electrons from the surface, and a UV LED driven electron gun directs photoelectrons towards the pendulum surface. We have demonstrated both charging and discharging of the pendulum with equivalent charging rates of similar to 10(5)e/s, as well as spectral measurements of the pendulum charge resulting in a white noise level equivalent to 3 x 10(5)e/root Hz.
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