Very fast, precise and robust servo algorithm and tracking algorithm for a probe storage system are proposed, which use only probes without any additional high-resolution position sensors. servo algorithm uses the val...
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Very fast, precise and robust servo algorithm and tracking algorithm for a probe storage system are proposed, which use only probes without any additional high-resolution position sensors. servo algorithm uses the values read by servo probes as the coordinate of every data bit with one-to-one correspondence so that it provides high accuracy, short seek-time, and robustness. Also the concept of virtual subsection of data field is introduced to reduce the number of the servo probes. Tracking algorithm can detect two-axis position errors used for off-track control and synchronization independently and continuously. By vibrating the scanner and by multiplying two decomposition signals, position errors are modulated and demodulated from probe reading signal. servo+track code is designed to reduce total number of additional probes for servo and tracking and to have stable noise characteristics.
A universal locking model for single ion optical clocks was built based on a simple integrator and a double *** integrator algorithm parameters have been analyzed in both numerical simulations and *** frequency variat...
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A universal locking model for single ion optical clocks was built based on a simple integrator and a double *** integrator algorithm parameters have been analyzed in both numerical simulations and *** frequency variation measured by the comparison of two optical clocks coincides well with the simulation results for different second integrator *** to the experimental results,the sensitivity of the servo error influenced by laser frequency drift with the addition of a double integrator was suppressed by a factor of *** a week-long comparison of optical clocks,the relative uncertainty of the servo error is determined to be 1.9×10^(-18),which is meaningful for the systematic uncertainty of the transportable single^(40)Ca^(+)ion optical clock entering the 10^(-18)level.
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