仪器相稳定性的表征
Characterization of Instrumental Phase Stability
摘要：
大气中的水汽会对亚毫米波阵列（SMA）干涉仪造成显著的相位波动，特别是在其最高观测频段690 GHz。针对这种大气效应提出的一种解决方案是在230和690 GHz两个单独的频带上同时进行观测。虽然相位波动在较低频率下具有较小的幅度，但是由于阵列在该频率下对天体点源校准器的灵敏度更高，因此可以在更短的时间尺度上更准确地测量它们。理论上，我们可以测量230 GHz波段的大气相位起伏，用频率适当地缩放它们，并在观测后校准过程中将它们应用于690波段的数据。这种大气相位校准方案的最终极限将由IF和LO系统的仪器相稳定性确定。我们描述的IF和LO系统的相稳定性表征的方法和初步结果。
英文摘要：
Atmospheric water vapor causes significant undesired phase fluctuations for the Submillimeter Array (SMA) interferometer, particularly in its highest frequency observing band of 690 GHz. One proposed solution to this atmospheric effect is to observe simultaneously at two separate frequency bands of 230 and 690 GHz. Although the phase fluctuations have a smaller magnitude at the lower frequency, they can be measured more accurately and on shorter timescales due to the greater sensitivity of the array to celestial point source calibrators at this frequency. In theory, we can measure the atmospheric phase fluctuations in the 230 GHz band, scale them appropriately with frequency, and apply them to the data in 690 band during the post-observation calibration process. The ultimate limit to this atmospheric phase calibration scheme will be set by the instrumental phase stability of the IF and LO systems. We describe the methodology and initial results of the phase stability characterization of the IF and LO systems.
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