本論文對月球白天環境下的全天靜電分析儀(A-ESA, All-sky Electrostatic Analyzer)進行了初步熱分析。A-ESA基於頂帽型靜電分析儀原型，是一款設計用於測量月球電漿分佈函數、粒子通量和相關帶電粒子能量的儀器。由於A-ESA要安裝在月球漫遊車上，因此會暴露在當地的熱環境中。月球白天有14天的陽光照射，夜間有14天的黑暗，月表溫度環境是出了名的嚴苛。在月球赤道，日間最高氣溫在太陽頂峰時可達約1200C，在黎明或黃昏時降至約-1400C。由於漫遊車目前的設計不允許A-ESA在夜間運作，因此論文的研究範圍僅限於月球白天的溫度環境。
本研究通過有限元法熱模擬探討了現有A-ESA設計的熱性能，找出現有熱設計中可能存在的問題以及合適的登陸的月球緯度。模擬中使用A-ESA的簡化版CAD模型，以省略初步設計階段不需要的細節。從赤道到極地地區的月球各緯度的溫度條件都被納入模擬設置中。研究結果發現，在現有的工作溫度限制下，在中低緯度地區（00~600），A-ESA只能在黎明或黃昏運做;其餘時間的環境熱負載對於A-ESA來說根本無法承受。然而，研究發現當A-ESA在高緯度地區（750以上）的溫度環境時，能夠在整個月球白天運行。這些發現指出，A-ESA目前的熱設計使其成為適合探索月球極區電漿環境的儀器。

In this thesis, a preliminary thermal analysis of the A-ESA(All-sky Electrostatic Analyzer) in the lunar daytime environment is presented. Based off the archetype of the Top-hat ESA, A-ESA is an instrument designed to measure the lunar plasma distribution function, flux, and the associated charged particle energy. Since A-ESA is to be mounted on a lunar rover, it will inevitably be exposed to the local thermal environment. With 14 days of sunlight exposure in the daytime and 14 days of darkness during the nighttime, the lunar thermal environment is notoriously harsh. At the equator, the maximum daytime temperature can reach up to approximately 1200C at solar peak and drop to around -1400C at dawn or dusk. The current design of the rover doesn’t allow nighttime operation so the scope of the thesis work is limited to daytime only.
The thermal performance of the current A-ESA design is investigated via FEM(Finite Element Method) simulation in the thesis work to identify the possible faults in the current thermal design and the suitable landing latitudes. A simplified CAD model of A-ESA is used in the simulations to purposely omit the unneeded details in this preliminary design stage. Thermal conditions of various lunar latitudes, from the equator to the polar regions, were taken into simulation settings. It was found that at mid-to-low latitude regions(00 ~ 600), A-ESA is only allowed to operate at dawn or dusk under the given operating temperature limits. The environmental heat load during the rest of the day is simply unbearable to A-ESA. However, A-ESA was found to be capable of operating in the high-latitude regions( above 750) throughout the entire lunar daytime. These findings suggest that the current thermal design of A-ESA makes it a suitable candidate for the exploration of the lunar polar plasma environment.

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