Simulations and machine learning models for cosmic-ray short-term variations and test-mass charging on board LISA

IF 2.7 3区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS Experimental Astronomy Pub Date : 2024-10-30 DOI:10.1007/s10686-024-09962-8
Mattia Villani, Federico Sabbatini, Andrea Cesarini, Michele Fabi, Catia Grimani
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Abstract

Energetic particles of galactic and solar origin charge the metal free-falling test masses (TMs) of the interferometers for gravitational wave detection in space. The deposited charge couples with stray electric fields thus generating spurious Coulomb forces between the TMs and the electrode housing that limit the interferometer sensitivity. Long-term and short-term galactic cosmic-ray variations are strongly energy-dependent and the TM charging varies with particle energy distribution. We propose three different approaches involving Monte Carlo simulations and machine learning models in comparison to particle transport with the Parker equation to study the recurrent modulation of energy spectra of galactic particles ascribable to the passage of high-speed solar wind streams. The transit of interplanetary counterparts of coronal mass ejections modifies the effects of high-speed streams. This work aims at better understanding the energy-dependence of galactic cosmic-ray short-term variations for the Laser Interferometer Space Antenna (LISA), the first interferometer for gravitational wave detection in space, starting from lessons learned with LISA Pathfinder. The outcomes of our models will be used to assess the TM charging during the time LISA will remain in orbit around the Sun.

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宇宙射线短期变化模拟和机器学习模型以及 LISA 上的测试质量充电
来自银河系和太阳的高能粒子会给用于空间引力波探测的干涉仪的金属自由落体测试块(TMs)充电。沉积电荷与杂散电场耦合,从而在 TM 和电极外壳之间产生虚假的库仑力,限制了干涉仪的灵敏度。银河宇宙射线的长期和短期变化与能量密切相关,TM 电荷随粒子能量分布而变化。我们提出了三种不同的方法,包括蒙特卡罗模拟和机器学习模型,并与帕克方程的粒子传输进行比较,以研究高速太阳风流通过时银河系粒子能谱的反复调制。日冕物质抛射的行星际对应物的过境会改变高速流的影响。这项工作的目的是更好地理解银河宇宙射线短期变化的能量依赖性,为激光干涉仪空间天线(LISA)--第一个在空间探测引力波的干涉仪--服务,从 LISA 探路者吸取经验教训。我们的模型结果将用于评估 LISA 在绕太阳运行期间的 TM 充电情况。
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来源期刊
Experimental Astronomy
Experimental Astronomy 地学天文-天文与天体物理
CiteScore
5.30
自引率
3.30%
发文量
57
审稿时长
6-12 weeks
期刊介绍: Many new instruments for observing astronomical objects at a variety of wavelengths have been and are continually being developed. Furthermore, a vast amount of effort is being put into the development of new techniques for data analysis in order to cope with great streams of data collected by these instruments. Experimental Astronomy acts as a medium for the publication of papers of contemporary scientific interest on astrophysical instrumentation and methods necessary for the conduct of astronomy at all wavelength fields. Experimental Astronomy publishes full-length articles, research letters and reviews on developments in detection techniques, instruments, and data analysis and image processing techniques. Occasional special issues are published, giving an in-depth presentation of the instrumentation and/or analysis connected with specific projects, such as satellite experiments or ground-based telescopes, or of specialized techniques.
期刊最新文献
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