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26 August 2022 Tracking ALMA System Temperature with Water Vapor Data at High Frequency
Hao He, William R.F. Dent, Christine Wilson
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Proceedings Volume PC12190, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI; PC121901R (2022) https://doi.org/10.1117/12.2642946
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada
Conference Poster
Abstract
In this poster, we present a new method to measure system temperature Tsys for ALMA submillimeter telescope high frequency observations. Traditional Tsys measurements for ALMA use discrete atmosphere (ATM) calibrations done every few minutes, which usually involves 10 ∼ 20 ATM calibrations at high frequencies. Our new method use water vapor radiometer (WVR) data to track the continuous Tsys. We find a tight linear correlation between Tsys measured using traditional method and Tsys extrapolated based on WVR data with scatter of 0.5% – 3%. We applied the extrapolated semi-continuous Tsys on a few data sets from Band 7 to Band 10 and compare the flux measured using traditional and our new methods. We find the discrete and continuous Tsys methods give us consistent flux measurements with difference up to 5%, while our new method has slightly better flux consistency. This new method can help to save up to 10% of time for ALMA high-frequency observations.
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Hao He, William R.F. Dent, and Christine Wilson "Tracking ALMA System Temperature with Water Vapor Data at High Frequency", Proc. SPIE PC12190, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI, PC121901R (26 August 2022); https://doi.org/10.1117/12.2642946
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KEYWORDS
Calibration
Observatories
Opacity
Radiometry
Submillimeter telescopes
Temperature metrology
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