Long term operation, performance and applications of cryogenic sapphire oscillators

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-29 DOI:10.1109/FREQ.2005.1573957

M. Tobar, E. Ivanov, C. Locke, P. Stanwix, J. Hartnett, A. Luiten, S. Bize, G. Santarelli, P. Wolf, A. Clairon

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Abstract

Cryogenic sapphire oscillators (CSO) developed at UWA have now been in operation around the world continuously for many years. Such oscillators are essential for interrogating atomic frequency standards at the quantum limit of projection noise; otherwise aliasing effects dominate due to the periodic sampling between successive interrogations of the atomic transition. For this reason, UWA oscillators are now operational at NMI (Sydney), LNE-SYRTE (Paris), the French Space Agency (CNES, Toulouse) and at UWA (Perth). Other applications, which have attracted attention in recent years, include tests on fundamental principles of physics, such as tests of Lorentz invariance. This paper reports on the long-term operation, performance of such oscillators. We compare the long-term drift of some different CSO's. The drift rates turn out to be linear over many years and in the same direction. However, the magnitude seems to vary by more than one order of magnitude between the oscillators, ranging from a few parts in 1014 per day to a few parts in 1013 per day

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低温蓝宝石振荡器的长期运行、性能和应用

西澳大学开发的低温蓝宝石振荡器(CSO)已在世界各地连续运行多年。这种振荡器对于在投影噪声的量子极限处询问原子频率标准是必不可少的;否则，由于原子跃迁的连续询问之间的周期性采样，混叠效应占主导地位。出于这个原因，西澳大学的振荡器现在在NMI(悉尼)、ne - syte(巴黎)、法国航天局(CNES，图卢兹)和西澳大学(珀斯)运行。近年来引起注意的其他应用包括对物理学基本原理的测试，如洛伦兹不变性的测试。本文报道了该类振荡器的长期运行性能。我们比较了一些不同的CSO的长期漂移。多年来，漂移率在同一方向上呈线性变化。然而，振子之间的幅度似乎变化不止一个数量级，从每天1014的几个部分到每天1013的几个部分不等

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Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005.

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