We report on the development of a passive sorption pump, capable of maintaining high-vacuum conditions in the InSight seismometer throughout the duration of any extended mission. The adsorber material is a novel zeolite-loaded aerogel (ZLA) composite, which consists of fine zeolite particles homogeneously dispersed throughout a porous silica network. The outgassing species within the SEIS evacuated container were analyzed and the outgassing rate was estimated by different methods. The results were used to optimize the ZLA composition to adsorb the outgassing constituents, dominated by water, while minimizing the SEIS bakeout constraints. The InSight ZLA composite additionally facilitated substantial CO2 adsorption capabilities for risk mitigation against external leaks in Mars atmosphere. To comply with the stringent particle requirements, the ZLA getters were packaged in sealed containers, open to the SEIS interior through 1μm$1~\upmu\mbox{m}$-size pore filters. Results from experimental validation and verification tests of the packaged getters are presented. The pressure forecast based on these data, corroborated by rudimentary in situ pressure measurements, infer SEIS operational pressures not exceeding 10−5mbar$10^{-5}~\mbox{mbar}$ throughout the mission.

中文翻译：

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InSight火星任务SEIS地震仪主吸附泵的研制

我们报告了被动吸附泵的开发，该泵能够在任何扩展任务的整个过程中保持 InSight 地震仪的高真空条件。吸附剂材料是一种新型载沸石气凝胶 (ZLA) 复合材料，它由均匀分散在多孔二氧化硅网络中的细沸石颗粒组成。分析了 SEIS 真空容器内的脱气物质，并通过不同的方法估算了脱气率。结果用于优化 ZLA 组合物以吸附以水为主的除气成分，同时最大限度地减少 SEIS 烘烤限制。InSight ZLA 复合材料还促进了大量的 CO2 吸附能力，以减轻火星大气外部泄漏的风险。为了符合严格的颗粒要求，ZLA 吸气剂包装在密封容器中，通过 1μm$1~\upmu\mbox{m}$ 大小的孔隙过滤器对 SEIS 内部开放。介绍了封装吸气剂的实验验证和验证测试结果。基于这些数据的压力预测，由基本的原位压力测量证实，推断 SEIS 操作压力在整个任务中不超过 10−5mbar$10^{-5}~\mbox{mbar}$。