ALMA temporal phase stability and the effectiveness of water vapor radiometer

Satoki Matsushita; Koh-Ichiro Morita; Denis Barkats; Richard E. Hills; Edward B. Fomalont; Bojan Nikolic

doi:10.1117/12.925872

10 October 2012 ALMA temporal phase stability and the effectiveness of water vapor radiometer

Satoki Matsushita, Koh-Ichiro Morita, Denis Barkats, Richard E. Hills, Edward B. Fomalont, Bojan Nikolic

Proceedings Volume 8444, Ground-based and Airborne Telescopes IV; 84443E (2012) https://doi.org/10.1117/12.925872
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

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.

Citation Download Citation

Satoki Matsushita, Koh-Ichiro Morita, Denis Barkats, Richard E. Hills, Edward B. Fomalont, and Bojan Nikolic "ALMA temporal phase stability and the effectiveness of water vapor radiometer", Proc. SPIE 8444, Ground-based and Airborne Telescopes IV, 84443E (10 October 2012); https://doi.org/10.1117/12.925872

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