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Published on: May 3, 2015
A capacitance-based micropositioning system for x-ray rocking curve measurements
G L Miller1, R A Boie, P L Cowan
1Bell Laboratories, Murray Hill, New Jersey 07974, USA.
The Review of Scientific Instruments
|September 1, 1979
Summary
Precise crystal positioning is crucial for x-ray experiments. A new system uses capacitance sensing and a Bragg condition servo loop for stability of 10(-7) radians and linear angular readout.
Area of Science:
- Physics
- Materials Science
- Crystallography
Background:
- X-ray diffraction experiments necessitate high-precision angular control of crystalline samples.
- Maintaining stability near the Bragg reflection condition is critical for accurate data acquisition.
Purpose of the Study:
- To describe a novel system for precise angular positioning in x-ray experiments.
- To achieve long-term angular stability and a linear angular readout.
Main Methods:
- Implementation of a novel capacitance sensing system for angle measurement.
- Utilization of an auxiliary servo loop synchronized with the Bragg reflection condition.
Main Results:
- The system demonstrates a long-term angular stability of approximately 10(-7) radians.
- A linear angular readout capability is achieved.
Conclusions:
- The developed system effectively meets the stringent angular positioning requirements for specific x-ray experiments.
- The combination of capacitance sensing and Bragg-based servo control ensures high stability and accurate measurement.
