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The parameters that are commonly shared are:
- Parameters Name: This should be a unique and descriptive identifier for the Science Parameters.
- Cycle Time: How often this calibrator should be observed.
- Default Integration Time: A nominal time for observing this calibrator. This will in general be exceeded as a subscan (for pointing observations a group of subscans), once started, must be completed. Might one day be overridden by the time taken to achieve some level of calibration accuracy.
- Data Origin: Type of data to use for deriving the calibration - the channel average data will often be used.
- Sub Scan Duration: This has a similar meaning to that for science observations i.e. the integration time will be made up of one or more subscans and, once a subscan has started, it will be completed. In addition, for calibrations that only make sense with some number
of distinct observations e.g. a five-position pointing, the subscan duration sets how long the telescope points at each position and an integer number of
subscans will always be observed.
- Force Atmospheric Calibration: Whether a system temperature measurement is needed will often be determined by the observing script, but checking this will ensure what one is taken every time the science Target is observed.
- Force Execution: It is possible that a calibration Target will not actually be observed as the script may decree that it is not necessary e.g. a sufficient calibration exists from a previously-executed SB. This can be overridden using this checkbox.
- Advanced Parameters: Not yet implemented.
Amplitude, phase, delay and sideband ratio calibrations only use the above parameters.
Next: Bandpass-only Parameters
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The ALMA OT Team, 2013 Oct 22