Charge management for gravitational-wave observatories using UV LEDs

被引：45

作者：

Pollack, S. E. ^{[1
]}

Turner, M. D. ^{[1
]}

Schlamminger, S. ^{[1
]}

Hagedorn, C. A. ^{[1
]}

Gundlach, J. H. ^{[1
]}

机构：

[1] Univ Washington, Ctr Expt Nucl Phys & Astrophys, Seattle, WA 98195 USA

来源：

PHYSICAL REVIEW D | 2010年 / 81卷 / 02期

关键词：

TEST MASS; LISA; SYSTEM; NOISE;

D O I：

10.1103/PhysRevD.81.021101

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

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