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A new UHV angle encoder for high-resolution synchrotron radiation monochromators.
Journal of Synchrotron Radiation
|July 21, 2004
Summary
New angle encoders ensure precise optical element positioning for monochromators. These high-precision devices offer sub-arcsecond accuracy, crucial for advanced synchrotron radiation applications.
Area of Science:
- Synchrotron Radiation Technology
- Optical Metrology
Background:
- High precision (0.1 arcsec) is essential for optical element positioning in new two-axes monochromators at BESSY II undulator beamlines.
- Existing measuring systems connected outside the vacuum vessel present limitations.
Purpose of the Study:
- To develop Ultra-High Vacuum (UHV)-compatible high-precision angle encoders.
- To overcome limitations of external measuring systems by mounting encoders directly on rotation axes.
Main Methods:
- Development and implementation of UHV-compatible high-precision angle encoders.
- Integration of encoders directly onto the rotation axes of monochromators.
- Utilizing a fast closed-loop control system.
Main Results:
- Experimental verification of an accuracy of 0.1 arcsec.
- Achieved a resolution of less than 0.01 arcsec.
- Demonstrated substantial advantages over external measuring systems.
Conclusions:
- The developed UHV-compatible high-precision angle encoders meet the stringent accuracy requirements for BESSY II monochromators.
- Direct mounting on rotation axes provides superior performance compared to external systems.
- The fast closed-loop control system enables high-accuracy positioning critical for advanced beamline applications.