GINGERino，一种深地下环形激光器的初步结果
First Results of GINGERino, a deep underground ringlaser
摘要：
大型环形激光陀螺仪能够以远低于$prad/s$的分数的精度测量角旋转，与广义相对论测试所需的精度$10^{-14}$ $rad/s$相差不远，这就是GINGER（Gyroscope-IN-GEneral-Relativity）实验的目标。这些特征并不能保证测量广义相对论Lense-Thirring效应的可能性，这种效应表现为地球自转速率的微小（$\approx 10^{-9} \times Ω_E$）扰动。原则上受外部局部干扰影响较小的地下位置代表了容纳这种具有挑战性的实验的良好候选者。GINGERino是一种测试仪器，用于研究GranSasso地下国际实验室（LNGS）最内部的残余局部扰动。它由一个方形环形激光器和一个$3.6$ m侧面组成。该仪器已被定制为实验室内特定位置所允许的较大尺寸。它的主要目的是测量非常低频率的旋转运动，以证明LNGS是一个非常低的噪声测量，并可能，广义相对论测试的合适位置。除了这个主要目标，GINGERino还将为大地测量和地球物理学提供独特的数据。其安装已于2015年完成。从那时起，已经收集了几个长的数据集，该装置已连续运行无人值守一个多星期。典型的功率谱灵敏度为几个$ 10^{-10} rad/s/\sqrt(Hz)$，积分时间不超过几十秒。正在对该装置进行改进，以改善积分时间。
英文摘要：
Large ring-laser gyroscopes are capable of measuring angular rotations with a precision well below fractions of $prad/s$, not far from $10^{-14}$ $rad/s$, the accuracy required for General Relativity tests, this is what the GINGER (Gyroscope-IN-GEneral-Relativity) experiment is aiming for. These features do not guarantee the possibility of measuring the General Relativity Lense--Thirring effect, that manifests itself as a tiny ($\approx 10^{-9} \times Ω_E$) perturbation of the Earth rotation rate. An underground location being in principle less affected by external local disturbances represents a good candidate for housing such a challenging experiment. GINGERino is a test apparatus to investigate the residual local disturbances in the most inner part of the underground international laboratory of the GranSasso (LNGS). It consists of a square ring laser with a $3.6$ m side. The instrument has been tailored to be the larger allowed by the particular location inside the laboratory. Its main objective is to measure the very low frequency rotational motions, in order to prove that LNGS is a suitable location for very low noise measurements and, possibly, General Relativity tests. Aside this main goal, GINGERino will provide unique data for geodesy and geophysics. Its installation has been completed during 2015. Since then, several long set of data have been collected, and the apparatus has been continuously running unattended for more than one week. The typical power spectrum sensitivity was a few $ 10^{-10} rad/s/\sqrt(Hz)$, with integration time not longer than tens of seconds. Improvements of the apparatus are ongoing in order to improve the integration time.
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