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• W3124549281 abstract "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." @default.
• W3124549281 created "2021-02-01" @default.
• W3124549281 creator A5027236648 @default.
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• W3124549281 date "2010-08-25" @default.
• W3124549281 modified "2023-09-24" @default.
• W3124549281 title "Testing the Atacama Compact Array Phase-Correction Scheme Using the Submillimeter Array" @default.
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• W3124549281 doi "https://doi.org/10.1093/pasj/62.4.1053" @default.
• W3124549281 hasPublicationYear "2010" @default.
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