A cantilevered liquid-nitrogen-cooled silicon mirror for the Advanced Light Source Upgrade
| Autor: | Simon A. Morton, Elaine DiMasi, Grant Cutler, Howard A. Padmore, Daniele Cocco, Manuel Sanchez del Rio |
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| Rok vydání: | 2020 |
| Předmět: |
Nuclear and High Energy Physics
Cantilever Materials science Photon 030303 biophysics Biophysics Cryogenics Optical Physics 01 natural sciences Physical Chemistry 03 medical and health sciences Rare Diseases Optics 0103 physical sciences high heat-load liquid-nitrogen cooling wavefront propagation Instrumentation 010302 applied physics 0303 health sciences Radiation liquid-nitrogen cooling business.industry Strehl ratio cantilevered mirrors Polarization (waves) Condensed Matter Physics Research Papers Insertion device Upgrade Beamline cryogenics silicon mirrors business Physical Chemistry (incl. Structural) |
| Zdroj: | Journal of synchrotron radiation, vol 27, iss Pt 5 Journal of Synchrotron Radiation |
| Popis: | A cantilevered liquid-nitrogen-cooled silicon mirror is described that will achieve diffraction-limited performance even under extreme power density. This mirror will serve as a robust first optic for the high-brightness undulator beamlines at the upgraded Advanced Light Source. This paper presents a novel cantilevered liquid-nitrogen-cooled silicon mirror design for the first optic in a new soft X-ray beamline that is being developed as part of the Advanced Light Source Upgrade (ALS-U) (Lawrence Berkeley National Laboratory, USA). The beamline is optimized for photon energies between 400 and 1400 eV with full polarization control. Calculations indicate that, without correction, this design will achieve a Strehl ratio greater than 0.85 for the entire energy and polarization ranges of the beamline. With a correction achieved by moving the focus 7.5 mm upstream, the minimum Strehl ratio is 0.99. This design is currently the baseline plan for all new ALS-U insertion device beamlines. |
| Databáze: | OpenAIRE |
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