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For the submillimeter band observations, we have been routinely adopting thecalibration cycle time of 20-30 minutes, which is the same as any typicalcentimeter and millimeter band observations. This cycle time, largely correctsonly the instrumental phase fluctuations and there exists residual phasefluctuations, which are attributed to temporal and spatial atmospheric phasefluctuations. Hence, the classical calibration cycle needs closer attention forany future submillimeter band observations. We have therefore obtainedfast-switching test data, cycling between three nearby calibrators, using thesubmillimeter array (SMA) with a cycle time of $\sim$90 sec, in order tounderstand and optimize the calibration cycle suitably, thereby to achieve theprojected sensitivity, angular resolution and dynamic range for the SMA. Here,we present the preliminary results from this study.

Using Fast-Switching Data to Characterize Atmospheric Phase Fluctuations at the Submillimeter Array