LiteBIRD is a spacecraft to observe the polarization signal of the cosmic microwave background radiation (CMB). In the development of its payload module, it is important to design the mechanical structures with enough rigidity to withstand the launch environment while providing enough thermal insulation to cool the telescopes down to 5 K. We need to reduce the mass of the 5-K structure, which consists of three telescopes, the low-frequency telescope (LFT) led by JAXA and the mid-frequency and high-frequency telescopes (MFT and HFT) led by CNES. In this paper, we report the mechanical design of the LFT and the structural analysis using Nastran. We made a structural mathematical model of the LFT and performed modal and quasi-static analyses. We successfully reduced the LFT mass while keeping the natural resonance frequency higher than requirements. Additionally, we report the mechanical design and the current status of the structural analysis for the payload module.
The Institute of Space and Astronautical Science (ISAS) began using Concept Maturity Levels (CMLs) in its space science program in 2017. The CMLs have been developed at the Jet Propulsion Laboratory (JPL) for measuring and communicating the maturity of space mission concepts. Using the JPL CML Matrix as reference, ISAS has been developing the ISAS version of CML matrix and checklist by considering difference in programmatics and systems engineering. The CML starts level 1 and we use up to level 5. The 150 checklist items are subdivided into 21 categories spanning from science objectives to cost estimation. We applied the ISAS CMLs to proposal templates for the last two AOs of the ISAS M-class missions and have been using the CML checklist to clarify the maturity level of existing missions up to the mission definition phase. In this paper, we present 1) what we needed to do in customizing the CML checklist for ISAS, 2) responses from the ISAS mission study teams, and 3) future plans for improvement.
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