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Calibration Setup

In the Calibration Setup form, the user can specify the calibrationsources that should be observed. If System-defined calibration is selected the system will select the calibrators and it is STRONGLY recommended that this be chosen; the observatory willensure that suitable calibrators are used.

When a User-defined calibration is specified a five-column tablebecomes visible in which the calibration types and the calibrationsources can be added or deleted via the corresponding buttons. Withuser-defined calibration the user has a choice between DynamicCalibrators and Fixed Calibrators.

With Add Dynamic Calibrator... , a calibrator query is createdusing the Calibrator Query Editor. The user is first prompted for thetype of calibration he is trying to create and then defines a searchcriteria that is used to search the ALMA Source Catalogue for asuitable calibrator at the time of the observations. The query can betested from within the Science Goal using the online version of thecurrent ALMA Calibrator Catalogue, or with a copy of this containedwithin the OT. We recommend that you use the online catalogue.

Alternatively, Add Fixed Calibrator... can be selected. Fixedcalibrator sources specify an actual source to be observed, not asearch criteria. They can be a Solar System object, a sidereal sourcetaken from the ALMA Source Catalogue, or the user can create a sourcethemselves by entering coordinates and, optionally, a fluxmeasurement. These sources are defined using the Calibration SourceEditor, the workings of which are fairly straightforward.

Figure 6.9: The Calibration Setup Parameters form. The calibration strategy can be selected between System or User-defined.
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Once a calibrator query or source has been defined, it is entered intoa table. The parameters of the calibrator can hereafter be editedusing the Edit Criteria... or Edit Target... buttons. Theprocess is exactly the same as when the calibrators were firstdefined, apart from the fact that the type of calibrator (phase,bandpass, etc.) cannot be changed.


next up previous contents index
Next: Control and Performance Up: Adding Phase-1 Science Goals Previous: Single Continuum   Contents   Index
The ALMA OT Team, 2011 May 20