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  • ALPACA
  • ALPACA-Advanced L-band Phased Array Camera for Astronomy
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  • 3 front end design
  • 3.2

3.2 · Changes

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Update 3.2 authored Aug 08, 2022 by Brian Jeffs's avatar Brian Jeffs
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......@@ -63,6 +63,6 @@ The cryostat was originally designed for use on the 305 m Arecibo telescope. Aft
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.
[Section 3.3 >>](/3-front-end-design/3.3)
[^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
[^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)
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ALPACA Design Review Documentation Package

Table of Contents

Section Links

  1. ALPACA Introduction and Instrument Description
  2. ALPACA Science Capabilities
  3. Front End Design
  4. Signal Transport
  5. Digital Back End Design
  6. Firmware and Software Design
  7. Interfaces Between ALPACA and GBO Infrastructure
  8. Design Risks
  9. Project Management Plan and Schedule
  10. Feasibility of Long-term Project Goals
  11. Additional Reference Documents