... | ... | @@ -63,6 +63,6 @@ The cryostat was originally designed for use on the 305 m Arecibo telescope. Aft |
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A major feature of the design is the ability to easily remove a dipole/Low Noise Amplifier (LNA) assembly in case of failure of one of the 138 LNAs without disassembling the entire cryostat. The major advantage of the system was that, when installed on the rotary floor of the Arecibo telescope’s Gregorian dome, after warming up, an LNA could be replaced by removing the HDPE top hat and foam layers, pulling out the relevant dipole assembly, replacing it, the foam layers and the top hat, all without removing the cryostat. Given the cool-down / warm-up time of ~2 days (there are warm up resisters in the cryostat) it is not clear that replacing failed LNAs at the prime focus of the GBT is practical. However, the ability to so easily replace dipole assemblies will still avoid the need to completely open the cryostat.
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[Section 3.3 >>](/3-front-end-design/3.3)
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[^a]: Please refer to [Parshley et al. 2020](../uploads/7c6759a47aba883325e3d4aabe9049e8/ASME-PVP2020-21818-Parshley-vFinal.pdf) for more details of the cryo-mechanical design of the ALPACA Cryostat
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[^a]: Please refer to [Parshley et al. 2020](../uploads/7c6759a47aba883325e3d4aabe9049e8/ASME-PVP2020-21818-Parshley-vFinal.pdf) for more details of the cryo-mechanical design of the ALPACA Cryostat |
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[Section 3.3 >>](/3-front-end-design/3.3) |