This presentation highlights the 2024 instrumentation suite in use at the Baade and Clay telescopes of the Las Campanas Observatory. Following two decades of operations, the partnership between the Carnegie Institution for Science, Harvard University, the University of Arizona, Massachusetts Institute of Technology, and the University of Michigan provides our observing community with seven facility instruments and seven PI instruments. Five of those instruments (IMACS, MAGE, FIRE, FOURSTAR and LDSS3) are mounted permanently at the telescopes and ready to be used every night. The availability of one of the Nasmyth ports and a Cassegrain focus at the Clay telescope, allows a scheduled rotation of the other eight instruments (MIKE, PFS, M2FS, IFUM, PISCO, MAGAOX, MEGACAM, WINERED) according to the scientific needs of the community in each semester. In this presentation we will give a brief introduction for all the facility instruments followed by a status report of their use and performance. We will also present the challenges posed by continuous operations and regular maintenance. Finally, we will outline the future instrumentation projects and upgrades.
In the manufacturing process of Carbon Fiber Reinforced Polymer (CFRP) mirrors (replicated from a mandrel) the orientation of the unidirectional carbon fiber layers (layup) has a direct in influence on different aspects of the final product, like its general (large scale) shape and local deformations. In particular, optical methods used to evaluate the surface's quality, can reveal the presence of print-through, a very common issue in CFPR manufacture. In practical terms, the surface's irregularities induced, among other artifacts, by print-through, produce unwanted scattering effects, which are usually mitigated applying extra layers of different materials to the surface. Since one of the main goals of CFPR mirrors is to decrease the final weight of the whole mirror system, adding more material goes in the opposite direction of that. For this reason a different layup method is being developed with the goal of decreasing print-through and improving sphericity while maintaining mechanical qualities and without the addition of extra material in the process.
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