A simple method for mitigating error in the fixed-offset of a double-crystal monochromator.

Area of Science:

• Physics
• Materials Science
• Optics

Background:

• Maintaining a constant monochromatic synchrotron X-ray beam height across varying energies is crucial for experiments.
• Double-crystal monochromators typically adjust crystal separation (gap) via second crystal translation for energy variation through crystal pair rotation.
• Accurate translation of the second crystal necessitates precise knowledge of the crystal gap and any crystal miscuts.

Purpose of the Study:

• To provide a simple method for calibrating the crystal gap in double-crystal monochromators.
• To eliminate errors associated with fixed beam offset during calibration.
• To ensure a constant X-ray beam height for all energies.

Main Methods:

• The method utilizes measured variations in the X-ray beam height.
• It calibrates the crystal gap by analyzing these height variations.
• The technique accounts for and corrects errors from fixed beam offset.

Main Results:

• A straightforward calibration of the crystal gap is achieved.
• The method successfully eliminates errors in the fixed beam offset.
• Consistent monochromatic synchrotron X-ray beam height is maintained across different energies.

Conclusions:

• The presented method offers a simple and accurate way to calibrate crystal gaps in double-crystal monochromators.
• This calibration is essential for maintaining stable X-ray beam height, critical for precise synchrotron experiments.
• The technique improves the reliability and accuracy of X-ray beam delivery in scientific applications.