The new Integral Field Unit (IFU) for the OSIRIS spectrograph on the 10.4-m Gran Telescopio CANARIAS (GTC), Mirror-slicer Array for Astronomical Transients (MAAT), will see its first light in Autumn 2024. The field is 10" x 7" with 23 slices 0.305" wide, resulting in a spaxel size of 0.254" x 0.305". The wavelength range is 360 nm to 1000 nm. The spectral resolution will be approximately 1.6 times larger than with a standard slit of 0.6" due to the smaller size of the slices. All eleven Volume Phase Holographic Gratings (VPHs) and grisms will be available to provide broad spectral coverage with low to intermediate resolution (R=600 to 4100). The small space envelope, the maximum weight of the mask holder, and the curvature and tilt of the slit created additional design challenges. We will present the relevant aspects of the construction of the MAAT IFU optical bench, mechanical support, and the upgrade of the OSIRIS Mask Charger necessary to host MAAT.
The communication architecture required to provide a bidirectional communication between a central command node and a full set of fiber positioners feeding a spectrograph is studied. Six different architectures have been analyzed in terms of communication time and power consumption. These architectures are the result of the combination of three different communication protocols: transmission control protocol/internet protocol (TCP/IP) over ethernet, interintegrated circuit (I2C), and controller area network. The design of communication architecture must prioritize between communication time and power consumption. The fastest architecture is the hybrid TCP/IP over ethernet-I2C. This architecture requires the least time to provide a full set of coordinates to every fiber positioner less than 50 ms. The most power efficient solution is the I2C—I2C with demultiplexers. This architecture solves a bidirectional communication between a central node and a full set of fiber positioners requiring only an addition of 27 mW.
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