太阳可以翻转增加航天器质量的屏蔽效应

中文摘要 AI 辅助

航天器结构通常被视为对高能粒子的屏蔽。我们发现太阳可以逆转增加该结构的效果。自由落体测试质量是引力波天文台和等效原理实验的惯性参考；它们上积累的电荷与杂散电场耦合，产生限制灵敏度的加速度噪声。在类似LISA的系统中，将周围铝从16增加到24 g cm-2，在太阳活动极小期使停止质子群体减少(2.3±0.5)%，但在太阳活动极大期使其增加(17.0±1.0)%，交叉点位于深度太阳活动极小期区域。完整的2-24 g cm-2质量曲线在太阳活动极小期显示宽极大值，但在极大期显示单调上升。这种逆转的产生是因为增加的材料既衰减入射质子，又将核过程产生的群体馈入停止能量窗口。对已发表充电速率的一阶投影给出净充电速率约-2%和+11%的变化，影响电荷积累、放电要求及相关噪声预算。因此，结构权衡的符号并非仅由结构本身决定。

英文摘要

Spacecraft structure is usually treated as shielding against energetic particles. We find that the Sun can reverse the effect of adding that structure. Free-falling test masses are the inertial references of gravitational-wave observatories and equivalence-principle experiments; charge accumulated on them couples to stray electric fields and produces acceleration noise that limits sensitivity. In a LISA-like system, increasing the surrounding aluminium from 16 to 24 g cm -2 reduces the stopping-proton population by (2.3 $\pm$ 0.5)% at solar minimum but increases it by (17.0 $\pm$ 1.0)% at solar maximum, the crossover lying in the deep-solar-minimum regime. Complete 2-24 g cm -2 mass curves show a broad maximum at solar minimum but a monotonic rise at maximum. The reversal arises because added material both attenuates incident protons and feeds a nuclear-processed population into the stopping-energy window. A first-order projection onto published charging rates gives changes of about -2% and +11% in the net charging rate, affecting charge accumulation, discharge requirements and the associated noise budget. The sign of a structural trade is therefore not fixed by the structure alone.

发表机构

• Gulf University for Science and Technology（海湾科学技术大学）

机构由 AI 辅助整理，请以论文原文为准。