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Calibration Setup

The Calibration Setup page allows a user to choose between user-defined and system-defined calibrators. It is STRONGLY recommended to choose the system-defined option; the observatory will ensure that suitable calibrators are used. If user-defined calibration is chosen, the reasons why and the choice of calibrators must be described in the Technical Justification node (Section 5.3.6).

When user-defined calibration is specified, a table appears in which the calibration sources can be added, deleted or edited. The initial list of calibrators describes the default calibration scheme for ALMA projects and appear in the approximate order in which they will be executed.

Two types of calibrator are available: fixed and dynamic. Fixed calibrators request a specific source whilst the dynamic variant consists of criteria (position, search radius, flux limits) that are used to choose a source from the ALMA calibrator database at the time that the SB is executed. Dynamic queries can be tested during Phase 1, but the database is likely to change between proposal submission and program execution.

The main use of user-defined calibration is probably to change some of the default dynamic queries to fixed calibrators. It is also possible to define additional calibrations, but removing the single-instance of the amplitude, bandpass or phase calibrator is not allowed - this will cause a validation error.


next up previous contents
Next: Control and Performance Up: Adding Phase-1 Science Goals Previous: Multiple velocities and tuning   Contents
The ALMA OT Team, 2016 Aug 23