使用SMA测试ACA相位校正方案
Testing the ACA Phase Correction Scheme using the SMA
摘要：
我们进行了观测测试的阿塔卡马大型毫米波和亚毫米波阵列（ALMA）的阿塔卡马紧凑阵列（ACA）的相位校正方案使用的亚毫米波阵列（SMA）。毫米波和亚毫米波干涉仪受对流层水汽折射的影响很大，导致相位起伏。ACA计划通过创建相位屏来使用最外部天线的相位信息并内插到内部天线来补偿大气相位波动。利用SMA测试了利用相位屏的内插和外推相位校正方案，以研究这些方案的有效性。我们产生一个平面的波前（相位屏幕）从三个天线的相位信息为每个集成，这个相位屏幕是用于内插和外推的内部和外部天线的相位，分别。插值方案的结果得到了明显的改善，表明ACA相位校正方案可以很好地工作。另一方面，外推方案往往不能改善结果。在外推之后，在距三个参考天线的中心约140 m的距离处的天线上显示出意想不到的大相位波动。这些方向矢量几乎垂直于风向，这表明冻结相位屏可以很好地解释相位波动。
英文摘要：
We conducted the observational tests of a phase correction scheme for the Atacama Compact Array (ACA) of the Atacama Large Millimeter and submillimeter Array (ALMA) using the Submillimeter Array (SMA). Interferometers at millimeter- and submillimeter-wave are highly affected by the refraction induced by water vapor in the troposphere, which results as phase fluctuations. The ACA is planning to compensate the atmospheric phase fluctuations using the phase information of the outermost antennas with interpolating to the inner antennas by creating a phase screen. The interpolation and extrapolation phase correction schemes using phase screens are tested with the SMA to study how effective these schemes are. We produce a plane of a wavefront (phase screen) from the phase information of three antennas for each integration, and this phase screen is used for the interpolation and extrapolation of the phases of inner and outer antennas, respectively. The interpolation scheme obtains apparently improved results, suggesting that the ACA phase correction scheme will work well. On the other hand, the extrapolation scheme often does not improve the results. After the extrapolation, unexpectedly large phase fluctuations show up to the antennas at the distance of ~140 m away from the center of the three reference antennas. These direction vectors are almost perpendicular to the wind direction, suggesting that the phase fluctuations can be well explained by the frozen phase screen.
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