标题： LISA中臂锁定的性能 显示英文标题

标题： The performance of arm locking in LISA

摘要： 为了使激光干涉空间天线（LISA）达到其设计灵敏度，必须将自由运行激光频率噪声耦合到信号读出中的程度降低超过14个数量级。 一种用于减少激光频率噪声的技术将是臂锁定，其中激光频率被锁定到LISA臂的长度。 本文详细介绍了臂锁定的实现，研究了轨道效应、多普勒知识误差的影响以及噪声限制。 在考虑主要预期噪声源的情况下计算了臂锁定的噪声性能：超稳定振荡器（时钟）噪声、航天器运动和散粒噪声。 研究这些问题表明，尽管双臂锁定[ A. Sutton & D. A Shaddock, Phys. Rev. D 78, 082001 (2008). ]在允许高增益方面优于单臂（或公共）臂锁定，但在激光频率牵引和噪声性能方面有缺点。 我们通过提出一种混合传感器来解决这个问题，保留公共和双臂锁定传感器的优点。 我们提出了一个臂锁定控制器的详细设计，并分析了在使用和不使用激光预稳定的情况下预期的性能。 我们观察到，在臂锁定控制器的单位增益频率附近，传感器相位有益地变化，使得增益比之前认为的高出10倍，而不会降低稳定性。 我们证明，仅使用臂锁定和时间延迟干涉测量即可实现LISA的频率噪声目标，而无需任何形式的预稳定。 显示英文摘要

摘要： For the laser interferometer space antenna (LISA) to reach it's design sensitivity, the coupling of the free running laser frequency noise to the signal readout must be reduced by more than 14 orders of magnitude. One technique employed to reduce the laser frequency noise will be arm locking, where the laser frequency is locked to the LISA arm length. This paper details an implementation of arm locking, studies orbital effects, the impact of errors in the Doppler knowledge, and noise limits. The noise performance of arm locking is calculated with the inclusion of the dominant expected noise sources: ultra stable oscillator (clock) noise, spacecraft motion, and shot noise. Studying these issues reveals that although dual arm locking [A. Sutton & D. A Shaddock, Phys. Rev. D 78, 082001 (2008).] has advantages over single (or common) arm locking in terms of allowing high gain, it has disadvantages in both laser frequency pulling and noise performance. We address this by proposing a hybrid sensor, retaining the benefits of common and dual arm locking sensors. We present a detailed design of an arm locking controller and perform an analysis of the expected performance when used with and without laser pre-stabilization. We observe that the sensor phase changes beneficially near unity-gain frequencies of the arm-locking controller, allowing a factor of 10 more gain than previously believed, without degrading stability. We show that the LISA frequency noise goal can be realized with arm locking and Time-Delay Interferometry only, without any form of pre-stabilization.