未来天基干涉仪的先进无阻力概念:加速度噪声性能
Advanced drag-free concepts for future space-based interferometers: acceleration noise performance
摘要:
未来用于空间引力物理学实验的无阻力任务需要具有极其苛刻的传感和干扰减少要求的引力参考传感器。具有两个立方体传感器的配置是激光干涉仪空间天线(LISA)的当前基线,并且已经达到高度成熟。尽管如此,已经提出了几个有前途的概念,其潜在应用超出了LISA,目前正在斯坦福大学的HEPL和德国的EADS Astrium进行研究。一般的动机是利用实现改进的干扰减少的可能性,并最终了解如何低加速度噪声可以推动未来的任务与现实的设计。在本文中,我们讨论了干扰减少要求LISA和超越,描述了四种不同的有效载荷的概念,比较预期的应变灵敏度在“低频”区域的频谱,占主导地位的加速度噪声,并最终讨论的优点和缺点,这些概念中的每一个在实现干扰减少的天基探测器超越LISA。
英文摘要:
Future drag-free missions for space-based experiments in gravitational physics require a Gravitational Reference Sensor with extremely demanding sensing and disturbance reduction requirements. A configuration with two cubical sensors is the current baseline for the Laser Interferometer Space Antenna (LISA) and has reached a high level of maturity. Nevertheless, several promising concepts have been proposed with potential applications beyond LISA and are currently investigated at HEPL, Stanford, and EADS Astrium, Germany. The general motivation is to exploit the possibility of achieving improved disturbance reduction, and ultimately understand how low acceleration noise can be pushed with a realistic design for future mission. In this paper, we discuss disturbance reduction requirements for LISA and beyond, describe four different payload concepts, compare expected strain sensitivities in the 'low-frequency' region of the frequency spectrum, dominated by acceleration noise, and ultimately discuss advantages and disadvantages of each of those concepts in achieving disturbance reduction for space-based detectors beyond LISA.
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