Optical pseudomotors for soft x-ray beamlines

Area of Science:

• Optics
• X-ray Science
• Beamline Technology

Background:

• Soft x-ray beamlines utilize motorized optical elements for precise photon beam alignment and focusing.
• Adjusting individual optical element degrees of freedom typically affects multiple beam parameters simultaneously.
• Independent control over specific optical parameters is challenging due to coupled motion effects.

Purpose of the Study:

• To define and implement 'optical pseudomotors' for independent control of beamline optical parameters.
• To develop an analytic method for relating physical mirror motions to beam parameter variations.
• To validate the optical pseudomotor concept for independent focus and position control at synchrotron beamlines.

Main Methods:

• Defined optical pseudomotors as specific combinations of physical motions of optical elements.
• Derived analytic relationships between mirror movements and resultant beam parameter changes.
• Implemented and tested the method on two beamlines at the ALBA synchrotron facility.

Main Results:

• Successfully demonstrated independent control of photon beam focus and position using optical pseudomotors.
• The developed method allows for precise adjustment of one optical parameter without altering others.
• Validated the practical applicability of optical pseudomotors in real-world beamline operations.

Conclusions:

• Optical pseudomotors offer a novel approach to decouple optical parameter control in x-ray beamlines.
• This technique significantly improves the ability to fine-tune beam characteristics for experiments.
• The method enhances experimental efficiency and precision at synchrotron facilities.