论文标题
弥合蒙特卡洛模拟与LISA探路者测试质量充电Lisa之间的差距
Bridging the gap between Monte Carlo simulations and measurements of the LISA Pathfinder test-mass charging for LISA
论文作者
论文摘要
立方金铂自由落体测试质量（TMS）构成了未来LISA和LISA样干涉仪的镜子，用于空间中的低频引力检测。银河系和太阳能起源的高能量颗粒为TMS充电，从而诱导损坏这些干涉仪灵敏度的杂种静电和磁力。在计划测试Lisa仪器的Lisa Pathfinder（LPF）任务的Lisa Pathfinder（LPF）任务中，对TM充电进行了前蒙特卡洛模拟。在任务操作期间比较了测量和模拟。测得的净TM充电与模拟估计相一致，而充电噪声则高出三到四倍。我们旨在弥合LPF TM充电噪声模拟和观察结果之间的差距。使用Fluka/Lei工具包进行了由于银河系和太阳颗粒而引起的LPF TM充电的新蒙特卡洛模拟。这允许将低能电子传播到几个电子伏。这些改进的Fluka/Lei模拟与在统计和蒙特卡洛错误中收集的观察结果一致。银河宇宙射线引起的充电噪声约为每秒一千个电荷。在太阳能颗粒事件中，该值增加到每秒数十万电荷。 Lisa TM充电期望有类似的结果。
Cubic gold-platinum free-falling test masses (TMs) constitute the mirrors of future LISA and LISA-like interferometers for low-frequency gravitational wave detection in space. High-energy particles of Galactic and solar origin charge the TMs and thus induce spurious electrostatic and magnetic forces that limit the sensitivity of these interferometers. Prelaunch Monte Carlo simulations of the TM charging were carried out for the LISA Pathfinder (LPF) mission, that was planned to test the LISA instrumentation. Measurements and simulations were compared during the mission operations. The measured net TM charging agreed with simulation estimates, while the charging noise was three to four times higher. We aim to bridge the gap between LPF TM charging noise simulations and observations. New Monte Carlo simulations of the LPF TM charging due to both Galactic and solar particles were carried out with the FLUKA/LEI toolkit. This allowed propagating low-energy electrons down to a few electronvolt. These improved FLUKA/LEI simulations agree with observations gathered during the mission operations within statistical and Monte Carlo errors. The charging noise induced by Galactic cosmic rays is about one thousand charges per second. This value increases to tens of thousands charges per second during solar energetic particle events. Similar results are expected for the LISA TM charging.
