The QUATI (Quick X-Ray Absorption Spectroscopy for Time and space resolved experiments) beamline will be dedicated to high-quality x-ray absorption spectroscopy experiments, with temporal and spatial resolution on a millisecond scale and in situ conditions: XANES, EXAF and XES. The beam extracted from a bending magnet source (3.2T) is collimated vertically by a cylindrical mirror (bounce up deflecting) located at 15m from the source inside the frontend, passes a double crystal monochromator (24m), and is then focused by a toroidal mirror (bounce down deflecting) located at 30m from the source. Both mirrors have an optical length of 1.2m and are equipped with a mechanical bender. The surface quality of both mirrors in the low spatial frequency range is characterized by the Long Trace Profiler (LTP). Five gravity compensators evenly distributed along the mirror are adjusted manually. With the optics measured in its orientation as in the beamline, a height error of less than 20nm PV for the M1 mirror and less than 40nm PV for the M2 mirror was achieved. The final height error adjusted by the gravity compensators is slightly better than the pure polishing due to the low frequency nature of the deformation caused by gravity. The result attends the project specifications for the QUATI beamline. Additionally, mechanical stability and temporal accommodation of the mirrors in the bending system were investigated.
The extreme and out of the ordinary sensitivity shared by the main gravitational waves detector like LIGO, Virgo and KAGRA has recently enabled to access to a new source of information for astronomy. However, future upgrades and new challenges continue to be addressed for reaching wider horizons of meas urable universe events through the gravitational waves. It leads to tighter and tighter specifications in several domains and in particular in the accuracy of the optics at the core of the detector.
For the optical surfaces of the critical optics of these detectors, the current specifications for instrumentations are not sufficient. For instance and concerning Advanced Virgo + critical mirrors (End Mirrors and Input Mirrors), the specification of their SFE (Surface Form error) is now reaching the accuracy level of one atom size, the angstrom, and for optical part up to 550 mm in diameter and 200 mm in thickness.
Besides this, the complete optical part is polished and shall have lateral reference surfaces that are at the level of usual specification of optical surfaces in astronomy.
Thales SESO is in charge of producing these uncommon optics and will present these extremely accurate optical parts, comparison of optical set-up performances as well as final performances.
Over more than 50th years Thales SESO represent a world leading designer and manufacturer of high-end, optical components such as telescopes and satellite-based space observation optics operating over the entire spectral range from infrared to x-ray wavelengths. Since early 90th we are actively working in the EUV, Soft-X-ray and hard X-ray spectral range, by developing new equipment and introducing metrology innovations and brand new patented products such as bender and bimorphs mirrors (1st and 2nd generation). In particular a set of customized solution and integrated system for imaging and spectroscopy have been developed basing on the original Wolter and Kirckpatrick-Baez design. Few example of reflective optics behaving both, as collimator, focusing and imaging device are discussed in this paper. A set of solutions to realize fixed curvature optics and dynamically bended device will be detailed to illustrate the flexibility and performances of these products..
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