Taking calibration data

Calibration data can be taken manually by commanding the individual components. For example, we would start by pointing all the telescopes to the flat field screen

Then we can turn of the argon lamp

And finally expose the spectrographs

gort provides some tools to simplify this procedure and define and run long calibration sequences requiring minimal human supervision. To launch a standard calibration sequence

See calibrate for details. Pre-defined calibration sequences are defined in the configuration file under recipes.calibration.sequences. Alternatively one can pass calibrate a dictionary with the calibration sequence details; such dictionary must match the model defined below.

An example of a very simple calibration sequence would be

which would take one bias, two darks with 90 and 900 second exposures, and then warm up the quartz lamp for 20 seconds before taking a 120 second flat exposure. Additional lamps can be added with the same format and multiple exposures can be taken for each lamp. Calibrations are always taken in order of bias, darks, then lamps.

In some cases one may want a series of fibres in the spectrophotometric mask to be exposed during a single exposure. We can define that with

which will rotate the fibre mask to expose each fibre whose name begins with P1- for 10 seconds each, starting with P1-2. "positions" can also be a explicit list of fibre mask positions. It’s possible to use the fibre selector with default parameters by setting "fibsel": True

In this case two LDLS exposures will be take with 270 and 300 second exposures, each one iterating over the default fibre mask positions.

Schema

type	object
properties
lamps	Arcs and lamps to take. Must be the name of the lamp outlet in the NPS.
	type	object
	patternProperties
	[a-zA-Z]+	type	object
		properties
		warmup	The warm-up time for the lamp in seconds.
			type	number
		exposure_time	oneOf	List of exposure times for the lamp.
				type	array
				items	type	number
				Exposure time for the lamp.
				type	number
		flavour	How to label this exposure type.
			type	string
			enum	arc, flat
		fibsel	oneOf	If defined, moves the fibre selector during the exposure.
				type	object
				properties
				initial_position	Initial fibre to expose.
					type	string
				positions
				time_per_position	How long to expose on each position/fibre.
					type	number
				Moves the fibre selector using default values.
				type	boolean
		additionalProperties	False
biases	Properties of the biases to take.
	type	object
	properties
	count	How many biases to take.
		type	integer
darks	Properties of the darks to take.
	type	object
	properties
	count	How many darks to take of each exposure time.
		type	integer
	exposure_time	oneOf	List of exposure times for darks.
			type	array
			items	type	number
			Exposure time for the lamp.
			type	number
additionalProperties	False