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Related Experiment Video

Updated: Mar 23, 2026

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
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Mercury Ion Clock for a NASA Technology Demonstration Mission.

Robert L Tjoelker, John D Prestage, Eric A Burt

    IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
    |March 29, 2016
    PubMed
    Summary
    This summary is machine-generated.

    The Jet Propulsion Laboratory developed a mercury ion atomic clock for space missions, achieving a fractional frequency stability of 2E-15. This advanced Deep-Space Atomic Clock (DSAC) technology enhances space navigation and scientific applications.

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    Area of Science:

    • Atomic physics
    • Space technology
    • Metrology

    Background:

    • Few atomic frequency standards meet stringent space operation requirements.
    • Jet Propulsion Laboratory is developing a linear ion-trap-based mercury ion clock (DSAC) under NASA's Technology Demonstration Mission program.
    • DSAC aims to provide new capabilities for space-based navigation and science.

    Purpose of the Study:

    • To demonstrate a novel mercury ion atomic clock for space applications.
    • To evaluate the performance and reliability of the DSAC technology in a space environment.
    • To enable autonomous timekeeping and enhance space-based navigation and scientific missions.

    Main Methods:

    • Development of a linear ion-trap-based mercury ion clock.
    • Testing of clock performance, including signal-to-noise ratio (SNR)*Q limited stability of 1.5E-13/τ(1/2).
    • Environmental testing including mechanical vibration, thermal-vacuum operation, and electromagnetic susceptibility.

    Main Results:

    • Observed clock stability of 1.5E-13/τ(1/2) limited by SNR*Q.
    • Measured fractional frequency stability of 2E-15 at one day (without drift removal).
    • Successful completion of mechanical vibration (14 grms), thermal-vacuum (42°C range), and electromagnetic susceptibility tests.

    Conclusions:

    • The first-generation DSAC demonstrates promising performance for space-based atomic frequency standards.
    • The technology enables autonomous timekeeping and has potential for even higher stability.
    • DSAC is suitable for a one-year flight demonstration as a hosted payload.