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This article reports on the long-term frequency stabilty characterisation ofa new type of cryogenic sapphire oscillator using an autonomous pulse-tubecryocooler as its cold source. This new design enables a relative frequencystability of better than 4.5e-15 over one day of integration. This representsto our knowledge the best long-term frequency stability ever obtained with asignal source based on a macroscopic resonator.

Unprecedented High Long Term Frequency Stability with a Macroscopic Resonator Oscillator