Preliminary stability analysis of Rb fountains for timescale generation

Two Rb fountains for timekeeping have been manufactured in collaboration among JSC Vremya-CH, Russia, SYRTE laboratory and Muquans company, France and installed at FSUE VNIIFTRI, Russia. They have been designed to have compact footprint and autonomous operation for long periods. One of the fountain has a good short term stability, 1.17 · 10
⁻¹³
at 1 s, while the other one, which is running for longer time, is better than 5 · 10
⁻¹⁶
at 1 day.