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The realization of the Ariel’s telescope is a challenging task that is still ongoing. It is an off-axis Cassegrain telescope (M1 parabola, M2 hyperbola) followed by a re-collimating off-axis parabola (M3) and a plane fold mirror (M4). It is made of Al 6061 and designed to operate at visible and infrared wavelengths. The mirrors of the telescope will be coated with protected silver, qualified to operate at cryogenic temperatures.
The qualification of the coating was performed according to the ECSS Q-ST-70-17C standard, on a set of samples that have been stored in ISO 6 cleanroom conditions and are subjected to periodic inspection and reflectance measurements to detect any potential performance degradation. The samples consist of a set of Aluminum alloy Al 6061-T651 disks coated with protected silver.
This paper presents the results of the morphological characterization of the samples based on Atomic Force Microscopy (AFM) and the reflectivity measurement in the infrared by Fourier Transform Infrared (FTIR) spectroscopy.
The eXTP scientific payload envisages a suite of instruments offering unprecedented simultaneous wide-band x-ray timing and polarimetry sensitivity. A large European consortium is contributing to the eXTP study and it is expected to provide key hardware elements, including the large area detector (LAD) composed by 40 modules for a total effective area of 3.0 m2 at 6.0 keV.
In this paper we describe the design solutions adopted for the most important thermo-mechanical design drivers of the LAD module, which have been elaborated and used for the demonstration of compliance to the system requirements at spacecraft level. We report in particular the mechanical design for the module and its components, the results of static and dynamic finite element analysis of a simplified model and the preliminary thermal analysis for both a single detailed model and for a reduced model for all the 40 modules of the large area detector. We note that, in parallel to this activity, the LAD module design is being revised and optimized by the LAD consortium. Such design optimization is still ongoing and it is not reported in this paper.
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