Finite element analysis of blackbody radiation environment for an ytterbium lattice clock operated at room temperature
Finite element analysis of blackbody radiation environment for an ytterbium lattice clock operated at room temperature
复制标题
室温镱晶格钟黑体辐射环境有限元分析
DOI：
10.1088/1681-7575/abeec3
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发表时间：
2021-03
期刊：
影响因子：
2.4
通讯作者：
Lyu Baolong
中科院分区：
文献类型：
--
作者：
Xiong Dezhi;Zhu Qiang;Wang Jinqi;Zhang Ang;Tian Congcong;Wang Bing;He Lingxiang;Xiong Zhuanxian;Lyu Baolong
黑体辐射（BBR）引起的斯塔克位移是限制光晶格钟频率不确定性的主要障碍。为了准确地了解冷原子感受到的温度，需要一个表征良好的BBR环境。在我们的镱原子钟中，晶格俘获的原子暴露在周围真空室壁和光学窗口的热辐射下。校准的铂电阻温度检测器用于真实的实时监测真空室温度。为了得到原子位置的有效温度Teff，我们对真空室的热辐射进行了有限元（FE）分析。由于我们的真空室中存在的温度不均匀性，有限的知识的空气对流贡献的最大部分的不确定性。对于我们典型的室温环境，T eff可以以160 mK的精度水平确定，对应于BBR斯塔克位移的5.3 × 10−18的分数频率不确定性。此外，我们使用一个简单的公式将T eff与监测点的温度联系起来，这使得我们能够在不使用FE分析的情况下知道T eff的值，从而能够实时校正BBR斯塔克位移。
The Stark shift due to blackbody radiation (BBR) is a key obstacle limiting the frequency uncertainty of optical lattice clocks. A well-characterized BBR environment is necessary to know exactly the temperature felt by the cold atoms. In our ytterbium clock, the lattice-trapped atoms are exposed to the thermal radiation of the surrounding vacuum chamber walls and optical windows. Calibrated platinum resistance temperature detectors are used to monitor the vacuum chamber temperature in real time. In order to obtain the effective temperature T eff in the position of the atoms, we perform finite element (FE) analysis to the thermal radiation of the vacuum chamber. Due to the temperature inhomogeneity existing in our vacuum chamber, the limited knowledge of the air convection contributes the largest part of the uncertainty in T eff. For our typical room temperature environment, T eff can be determined with an accuracy level of 160 mK, corresponding to a fractional frequency uncertainty of 5.3 × 10−18 for the BBR Stark shift. Additionally, we use a simple formula to relate T eff to the temperatures at the monitored points, which allows us to know the value of T eff without using FE analysis, and thus enables the real-time correction to the BBR Stark shift.
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