COS2035：在2030年代扩展宇宙起源光谱仪（COS）的远紫外（FUV）观测
COS2035: Extending COS/FUV Operations Through the 2030s
AI总结：
研究针对COS的FUV探测器增益下降问题，提出COS2035策略，通过四项技术突破和两项新使用政策，在2030年代扩展其FUV观测，实现FUV通道持续高生产力。
AI中文摘要：
宇宙起源光谱仪（COS）的远紫外（FUV）探测器存在增益下降问题，若不缓解，常用模式将无法使用。为在2030年代扩展COS FUV观测，COS团队制定了COS2035策略，基于现有COS2025规则进行四项技术突破并制定两项新使用政策。技术突破包括解耦波长校准与科学曝光、采用混合寿命位置架构、去除对飞行软件中八寿命位置限制的依赖、修订增益下降标记方法。新政策包括限制每个目标的信噪比及单个程序在单个寿命位置的时间占比。通过启用新的寿命位置，该策略使FUV通道在2030年代保持高生产力。
英文摘要：
The far-ultraviolet (FUV) detector of the Cosmic Origins Spectrograph (COS) accumulates gain sag where photons land, and without continued mitigation this degradation would render the most used modes unusable. To extend COS FUV operations through the 2030s, the COS team developed the COS2035 strategy, which builds on the existing COS2025 rules with four technical breakthroughs and two new usage policies. First, SPLIT-wavecals decouple wavelength calibration from science exposures and open detector real estate above the Pt-Ne lamp light leak. Second, a hybrid lifetime position (LP) architecture allows different gratings to operate at different LPs simultaneously. Third, the LP-infinity framework removes the dependence on the eight-LP limit in the COS flight software, supported by a new table-based APT and TRANS rules architecture. Fourth, a revised gain-sag flagging method evaluates integrated column count loss against the maximum achievable signal-to-noise (S/N) per mode. The two new usage policies cap per-target S/N at the maximum achievable value set by fixed-pattern noise, and limit any single program to 2\% of the lifetime at any single LP. With LP7 and LP10 enabled in Cycle 33 and LP11 and LP12 in active commissioning for Cycles 34 and 35, the COS2035 strategy positions the FUV channel for continued high productivity through the 2030s.
