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Orbit Correction with 2x16 Bit: Effects on Modelling

This report discusses the implementation of a 2x16-bit Digital-to-Analog Converter (DAC) for orbit correction in particle accelerators. Initial designs utilized 3 mrad correctors, with resolutions that were compromised during high-resolution experiments. Addressing these challenges, a solution featuring coarse/fine DACs with an effective 24-bit resolution has been implemented, resulting in orbit stabilization to ±3mm/day. Continuous drift correction is now routine, enhancing the precision of measurements and compensating for residual perturbations. Pilot experiments indicate a promising direction for future models, including a staged correction scheme.

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Orbit Correction with 2x16 Bit: Effects on Modelling

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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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