Armano M, Audley H, Baird J, Binetruy P, Born M, Bortoluzzi D, Castelli E, Cavalleri A, Cesarini A, Cruise A M, Danzmann K, de Deus Silva M, Diepholz I, Dixon G, Dolesi R, Ferraioli L, Ferroni V, Fitzsimons E D, Freschi M, Gesa L, Gibert F, Giardini D, Giusteri R, Grimani C, Grzymisch J, Harrison I, Heinzel G, Hewitson M, Hollington D, Hoyland D, Hueller M, Inchauspé H, Jennrich O, Jetzer P, Karnesis N, Kaune B, Korsakova N, Killow C J, Lobo J A, Lloro I, Liu L, López-Zaragoza J P, Maarschalkerweerd R, Mance D, Meshksar N, Martín V, Martin-Polo L, Martino J, Martin-Porqueras F, Mateos I, McNamara P W, Mendes J, Mendes L, Nofrarias M, Paczkowski S, Perreur-Lloyd M, Petiteau A, Pivato P, Plagnol E, Ramos-Castro J, Reiche J, Robertson D I, Rivas F, Russano G, Slutsky J, Sopuerta C F, Sumner T, Texier D, Thorpe J I, Vetrugno D, Vitale S, Wanner G, Ward H, Wass P J, Weber W J, Wissel L, Wittchen A, Zweifel P
European Space Astronomy Centre, European Space Agency, Villanueva de la Cañada, 28692 Madrid, Spain.
Albert-Einstein-Institut, Max-Planck-Institut für Gravitationsphysik und Leibniz Universität Hannover, Callinstraße 38, 30167 Hannover, Germany.
Phys Rev Lett. 2018 Feb 9;120(6):061101. doi: 10.1103/PhysRevLett.120.061101.
In the months since the publication of the first results, the noise performance of LISA Pathfinder has improved because of reduced Brownian noise due to the continued decrease in pressure around the test masses, from a better correction of noninertial effects, and from a better calibration of the electrostatic force actuation. In addition, the availability of numerous long noise measurement runs, during which no perturbation is purposely applied to the test masses, has allowed the measurement of noise with good statistics down to 20 μHz. The Letter presents the measured differential acceleration noise figure, which is at (1.74±0.05) fm s^{-2}/sqrt[Hz] above 2 mHz and (6±1)×10 fm s^{-2}/sqrt[Hz] at 20 μHz, and discusses the physical sources for the measured noise. This performance provides an experimental benchmark demonstrating the ability to realize the low-frequency science potential of the LISA mission, recently selected by the European Space Agency.
自首次结果发表后的几个月里，丽莎探路者号的噪声性能有所改善，这是因为测试质量块周围压力持续下降，布朗噪声降低，非惯性效应得到更好校正，静电力驱动校准也更精确。此外，进行了多次长时间噪声测量运行，期间未对测试质量块故意施加扰动，从而能够在统计数据良好的情况下测量低至20 μHz的噪声。这篇论文展示了测量得到的微分加速度噪声数据，在2 mHz以上为(1.74±0.05) fm s⁻²/√Hz，在20 μHz时为(6±1)×10 fm s⁻²/√Hz，并讨论了测量噪声的物理来源。这一性能提供了一个实验基准，证明了实现欧洲航天局最近选定的丽莎任务低频科学潜力的能力。
