## An Inertial Clock for Precision Measurements |

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### Contents

Diagram of the proof rotor | 43 |

Angular control feedback block | 63 |

Shroud rotor decay time versus | 78 |

3 other sections not shown

### Common terms and phrases

100 period averages Allan-variance Angular frequency angular velocity difference bearing drag Bernard bias torque calculated Cheung codecay run control run corotating rotors corotation runs derivative feedback discussed double magnetic suspension double suspension drag coefficient drift eddy current effects equations of motion ferrite frequency stability gas drag gravitational redshift Helmholtz coils i i i i i i i i i ideal rotor inertial clock inertial clock apparatus interrotor torsional coupling Leyh lifting force magnetic field Nibbler noise noiseless derivative feedback Nref oscillations parameters permanent magnets Position averages power spectrum precision clock proof rotor angular proof rotor decay proof rotor period proof rotor spindown proportional feedback REFADJ Ritter rotational rotor angular velocity rotor runs rotor spindown run shroud and proof shroud rotor period shroud rotor spindown shroud rotor suspension signal simulation run spectral density spinning rotor superconducting Sy(f temperature torque upper suspension vacuum chamber versus