ALMA temporal phase stability and the effectiveness of water vapor radiometer
ALMA temporal phase stability and the effectiveness of water vapor radiometer
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ALMA 时间相位稳定性和水蒸气辐射计的有效性
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
B. Nikolic
中科院分区：
文献类型：
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作者：
S. Matsushita;K. Morita;D. Barkats;R. Hills;E. Fomalont;B. Nikolic
给出了整个ALMA系统的时间相位稳定性。首先验证了时间相位稳定性：我们对一颗强类星体进行了长时间（几十分钟）的观测，利用水汽辐射计（WVRs）进行大气相位校正后推导出了时间结构函数，确认了所有基线的相位稳定性都达到了ALMA规范。然后我们验证了波段之间的频率转移：我们观测到一个明亮的类星体，并在两个频段之间切换，并确认相位在相位波动内恢复到原始值。除了这些结果，我们还研究了在不同频率、基线长度和天气条件下WVR相位校正的有效性。
We present the temporal phase stability of the entire ALMA system. We first verified the temporal phase stability: We observed a strong quasar for a long time (a few tens of minutes), derived the temporal structure function after the atmospheric phase correction using the water vapor radiometers (WVRs), and confirmed that the phase stability of all the baselines reached the ALMA specification. We then verified frequency transfer between bands: We observed a bright quasar and switched between the two frequency bands, and confirmed that the phase returned to the original values within the phase fluctuation. In addition to these results, we also studied the effectiveness of the WVR phase correction at various frequencies, baseline lengths, and weather conditions.