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A cantilevered liquid-nitrogen-cooled silicon mirror for the Advanced Light Source Upgrade
Grant Cutler1, Daniele Cocco1, Elaine DiMasi1
1Lawrence Berkeley National Laboratory, 1 Cyclotron Rd, Berkeley, CA 94720, USA.
Journal of Synchrotron Radiation
|September 3, 2020
Summary
A new liquid-nitrogen-cooled silicon mirror design for soft X-ray beamlines offers excellent performance. This novel optic achieves a high Strehl ratio, crucial for advanced synchrotron light source applications.
Area of Science:
- Optics and photonics
- Synchrotron radiation science
- Materials science
Background:
- Advanced Light Source Upgrade (ALS-U) requires novel optics for soft X-ray beamlines.
- High Strehl ratio is critical for precise X-ray focusing and polarization control.
Purpose of the Study:
- To present a novel cantilevered liquid-nitrogen-cooled silicon mirror design.
- To evaluate its performance for a new soft X-ray beamline at ALS-U.
Main Methods:
- Design and computational analysis of a cantilevered silicon mirror.
- Thermal management using liquid-nitrogen cooling.
- Optical performance evaluation via Strehl ratio calculations.
Main Results:
- The proposed mirror design achieves a Strehl ratio > 0.85 across the 400-1400 eV range.
- A Strehl ratio of 0.99 is attainable with minor focus adjustment.
- The design is selected as the baseline for new ALS-U insertion device beamlines.
Conclusions:
- The novel mirror design meets stringent performance requirements for soft X-ray applications.
- This development is a key advancement for the Advanced Light Source Upgrade project.
- The design's high Strehl ratio ensures optimal performance for polarization-controlled experiments.
