使用UV LED的引力波观测站的电荷管理
Charge Management for Gravitational Wave Observatories using UV LEDs
摘要：
引力波观测站（如空间LISA任务和地面LIGO探测器）端镜上电荷的积累可能成为噪声源，通过与附近表面的电子耦合限制此类探测器的灵敏度。扭秤对微小力的灵敏度很高，是测试引力波技术的理想工具。我们的扭摆装置包括一个可移动的Au-涂层的Cu板附近的Au-涂层的Si板摆悬挂在一个不导电的石英纤维。位于摆锤附近的UV LED从表面光致发射电子，并且UV LED驱动的电子枪将光电子导向摆锤表面。我们已经证明了充电和放电的钟摆与$\sim$ $10^5 e/\mathrm{s}$的等效充电率，以及光谱测量的钟摆电荷产生相当于$3\times10^5 e/\sqrt{Hz}$的白噪声水平。
英文摘要：
Accumulation of electrical charge on the end mirrors of gravitational wave observatories, such as the space-based LISA mission and ground-based LIGO detectors, 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 Au-coated Cu plate brought near a Au-coated Si plate pendulum suspended from a non-conducting 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 $\sim$$10^5 e/\mathrm{s}$, as well as spectral measurements of the pendulum charge resulting in a white noise level equivalent to $3\times10^5 e/\sqrt{Hz}$.
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