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Several optical ‘tricks’ have been used to obtain high spectral resolution and efficiency despite the large size of the telescope and the 1 arcscec sky aperture of the instrument, like superimposing the beams in order to minimize the size of the echelle grating.
The 220000 spectral resolution specified for the spectrograph requires a 3 x 1 echelle mosaic, since the largest echelle master that can be ruled has a ruled length of 408 mm (16 inch) and a width of up to 306 mm (12 inch).
The paper describes the design of the mosaic as well as the various phases of its assembly and alignment. We also introduce the mounting of the mosaic inside the mount in order to guaranty the long term stability ESPRESSO requires. We address the packing and conditioning of the mosaic for the transport to Chile, which has been proven to sustain extremely strong shock, without causing misalignment in the mosaic. Finally a short summary of the instrument performances is presented.
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