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Rapid in situ X-ray position stabilization via extremum seeking feedback
S Zohar1, N Venugopalan1, D Kissick1
1Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, BLDG 436, Argonne, IL 60439, USA.
Journal of Synchrotron Radiation
|February 27, 2016
Summary
Extremum seeking feedback control stabilizes X-ray beams at synchrotron facilities. This method ensures high-quality data by minimizing intensity fluctuations caused by beam position instability.
Area of Science:
- Physics
- Engineering
- Materials Science
Background:
- X-ray beam stability is critical for high-quality data collection at synchrotron facilities.
- Misalignments between X-ray beams and apertures cause significant intensity fluctuations.
Purpose of the Study:
- To implement an in situ vertical beam position stabilization method.
- To address intensity fluctuations caused by beam position instabilities.
Main Methods:
- Utilized extremum seeking feedback control (ESFC) for real-time vertical beam stabilization.
- Employed phase comparison of downstream intensity oscillations with pre-existing beam oscillations to determine spatial gradients.
Main Results:
- Achieved position recovery times of less than 6 seconds for vertical drift.
- Maintained intensity stability through a 5 µm aperture at 1.5% FWHM over 8 hours.
Conclusions:
- ESFC effectively compensates for vertical position drift from all sources.
- The developed method significantly enhances X-ray beam stability and data quality at synchrotrons.
