Astronomy and Astrophysics – Astrophysics – Instrumentation and Methods for Astrophysics
Scientific paper
2010-05-17
PASJ: 62(4), 1053-1062, Aug. 25, 2010
Astronomy and Astrophysics
Astrophysics
Instrumentation and Methods for Astrophysics
11 pages, 11 figures. Accepted for publication in PASJ
Scientific paper
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.
Chen Yu-Lin
Matsushita Satoki
No associations
LandOfFree
Testing the ACA Phase Correction Scheme using the SMA does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Testing the ACA Phase Correction Scheme using the SMA, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Testing the ACA Phase Correction Scheme using the SMA will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-57307