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Enhanced Orbit Correction Using 2x16 Bit Resolution: Impact on Instrument Modeling

Explore the effects of implementing 2x16 bit coarse/fine DACs for precise orbit correction in particle accelerators, enhancing resolution and stability for advanced experiments and machine studies. Learn about the continuous drift correction system, benefits of higher resolution DACs, and implications for precision modeling and sensor calibration.

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Enhanced Orbit Correction Using 2x16 Bit Resolution: Impact on Instrument Modeling

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  1. Orbit Correction with 2x16 Bit: Effects on Modelling • Initial design: 3mrad correctors, 16 bit DAC • First experiences with continous correction: High resolution experiments unacceptably perturbed by correction activity • Full dynamic range of correctors required by MD studies (large bump scans) • Solution: 2x16 bit coarse/fine DAC with range overlap provide 24 bit resolution

  2. New I/O Board: 2x16 Bit DAC

  3. Continous drift correction: Present Status • Result: Orbit stabilized to ±3mm/day • `All’ residual insertion device perturbations compensated below users sensitivity • Routine operation during user runs. • Mandatory for: • decaying superconducting magnet currents • field changes of electromagnetic undulator

  4. Continous drift correction: Present Status (cont’d) • Very reliable and precise • Faster BPM data acquisition with same precision under development : 10 orbits/s • New limit: electronic pick up BPM resolution

  5. Conclusions from Pilot Experiments • Perturbations beyond resolution of electronic pick-up BPMs correctable using photon BPMs • Idea: Staged correction scheme: • At larger deviations: Absolute to electronic pick-up BPM signals (center of Quads) • At resolution limit: Relative to photon BPM signals • `Passive’ complementary system data: used for consistency/HW sanity check

  6. Consequences for Modelling • Difficult photon BPM source point calibration: Measured sensitivity matrix • Adaptive figure of merit • Fitting procedures to estimate data quality • Current dependencies/Failures • Unforeseen anomalities

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