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MOTC01 |
Optics and Mechanics of Mirror Benders | |
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| We will explain the basic concepts of optics regarding focusing with grazing incidence reflective surfaces. The concept of aberration and figure error, and the aberrations associated to the typical geometric surfaces found in mirrors will be described with some detail. We will describe how mirror benders can approximate these geometrical figures, how to compute the required mechanical characteristics, and the optical effect of the residual errors. Finally, we will describe, and illustrate with examples, the main aspects that have to be considered in the mechanical implementation, their characterization and their operation in the beam-line. | ||
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Slides MOTC01 [7.335 MB] | |
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| MOPE01 | Stabilization Methods for Force Actuators and Flexure Hinges | 1 |
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In the framework of the design of an adaptive optics for x-ray mirrors a stabilization system* for force actuators and flexure hinges have been conceived. This corrector allows to deform the mirror surface at nanometre level but for this purpose it requires resolutions better than 0.02, by using ultra-low constant springs, and to preserve the introduced deformation it is needed to be stable at the same level. The corrector needs to be insensitive when dismantling and remounting the mirror. In the other hand in order to support the corrector its structure is attached to the bender frame and the spring force is transmitted through a level arm by means a bearing articulation. This introduces a small friction but it is still preferably to eliminate it. A new method based -k spring-like constant principle is proposed. Based on this technique it is possible to stabilize the force exerted on the mirror below 0,02N for an error range more than 1 mm. In addition applying the principle to a flexure it allows to compensate it in an angular range in within the torque variation tend to be null, below 0,005 Nm, thus becoming a short range, frictionless and zero torque articulation.
* Patent Registered |
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Poster MOPE01 [1.046 MB] | |
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-MOPE01 | |
| About • | paper received ※ 15 September 2016 paper accepted ※ 08 May 2017 issue date ※ 22 June 2017 | |
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| FRBA02 | The Nanobender: A New X-Ray Mirror Bender With Nanometer Figure Correction | 413 |
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Over time X-Ray mirrors are demanded for better focusing, closer to sample refocusing, spot size as well as better beam uniformity at sample position. Based on the experience of ALBA Phase I beam lines a new alter-native design of a mirror bender* is proposed. The system includes two main functionalities: the mirror bender mechanism and mirror figure error correc-tion. Both mechanisms are based on the introduction of a force constrain on the mirror surface instead of a geometrical one. As being based on a force mechanism they could reach high resolution and especially for the correctors which can achieve nanometre resolution. The correctors are designed to provide high force stability in the mirror side, eliminating the crosstalk between bending and figure correction, and minimizing the sensitivity to drifts. With such controlled deformation of the mirror substrate it is possible to obtain the desired surface figure not only to correct mirror figure errors but also to adapt it to the incident wavefront, thus becoming adaptive system. The mechanical solutions are presented which are able to correct mirror surfaces with a resolution of 1 nm reaching slope errors below 100 nrad.
* Patent Registered |
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Slides FRBA02 [4.766 MB] | |
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-MEDSI2016-FRBA02 | |
| About • | paper received ※ 03 October 2016 paper accepted ※ 08 May 2017 issue date ※ 22 June 2017 | |
| Export • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | |