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This study developed a low phase noise microwave source for space cold atom clocks (CACs). The new source improves frequency stability, crucial for accurate timekeeping in space missions.

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Area of Science:

  • Atomic Physics
  • Metrology
  • Space Science

Background:

  • Space cold atom clocks (CACs) require robust, compact, and adaptable microwave sources with low phase noise.
  • Ground-based fountain clocks are less susceptible to local oscillator noise than space-based CACs due to shorter dead times.

Purpose of the Study:

  • To design and measure a low-phase-noise microwave source qualified for space applications.
  • To enhance the frequency stability of space-based cold atom clocks.

Main Methods:

  • Development of a space-qualified microwave source.
  • Phase noise measurements near the carrier frequency.
  • Evaluation of frequency stability based on the clock cycle.

Main Results:

  • Achieved a phase noise level of 10^-6.7 * f^-1.5 rad^2/Hz near the carrier.
  • Demonstrated a guaranteed frequency stability of 1.4 × 10^-13 τ^-1/2 for typical space CAC operation.

Conclusions:

  • The developed microwave source meets the stringent requirements for space cold atom clocks.
  • The low phase noise performance significantly enhances the frequency stability of space CACs, enabling more precise timekeeping.