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Knowledgebase: General ALMA Queries
What is the tested capability of ALMA for bandpass calibration precision?
Posted by Anand Crossley, Last modified by Tristan Ashton on 24 September 2020 01:27 PM

The bandpass stability has been tested during 2013 and 2014 for Bands 3, 4, 6, 7, 8, 9, and 10 with 21–35 antennas. The amplitude variation is estimated to be <0.1% for Bands 3, 4, and 6, and <1% for the other Bands. The phase variation is estimated to be <0.3 deg for Bands 3, 4, 6, and 7, and <1 deg for Bands 8 and 9. (At Band 10, most quasars do not yield signal-to-noise ratios good enough for accurate bandpass calibration.) Dependence on time is relatively small compared to random noises. The nominal bandpass accuracy is <0.2% and <0.5 deg over the spectral resolution requested.

Smoothed bandpass calibration would work with the smoothing window of 125 MHz.

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