Quality Control and
Data Processing

HC PLOTS
Order definition
QC1 database (advanced users): browse | plot

Order-definition frames are spectroscopic flat fields. They are used to trace and identify spectral orders on the detector. There is one frame per input fibre (A or B). They are measured daily in HR with 1x1 and 2x1 binning; order-definition frames for UHR and MR are typically taken only when UHR or MR science data have been observed during the night.

Order definition frame. Example raw frame for the blue detector. The apparent gaps in the orders come from the pre-/overscan of the read-out ports.

QC1_parameters

FITS key	QC1 database: table, name	definition	class*	HC_plot**	more docu
QC.ORDER.NB	espresso_orderdef..fiba_order_nb	number of found orders from fibre A	CAL		[docuSys coming]
QC.ORDER.NB	espresso_orderdef..fibb_order_nb	number of found orders from fibre B	CAL		[docuSys coming]
*Class: KPI - instrument performance; HC - instrument health; CAL - calibration quality; ENG - engineering parameter **There might be more than one.

Trending

The number of orders is trended separately for the five different combinations of resolving power and binning: HR with 1x1 and 2x1 binning, UHR with 1x1 binning, and MR with 4x2 and 8x4 binning.

Scoring&thresholds Number of identified orders

The number of orders must be exactly 170 for HR and UHR and 85 for MR.

History

No particular events.

Algorithm Number of identified orders

The number of orders as identified by the pipeline for each fibre.

Due to ESPRESSO's optical design, each fibre has two images on the detector. In HR and UHR, these images are separated well enough so that they are counted as separate orders by the pipeline recipe. This gives 90 orders on the blue chip and 80 orders on the red. In MR, the two fibre images overlap and the pipeline counts them as one order. This means 45 orders on the blue and 40 orders on the red chip.

QC1_parameters

FITS key	QC1 database: table, name	definition	class*	HC_plot**	more docu
QC.ORDERnn.EXT[0,1].POS	espresso_orderdef..fiba_centorder_pos	position on detector of central order in fibre A [pixels]	HC		[docuSys coming]
QC.ORDERnn.EXT[0,1].POS	espresso_orderdef..fibb_centorder_pos	position on detector of central order in fibre B [pixels]	HC		[docuSys coming]
*Class: KPI - instrument performance; HC - instrument health; CAL - calibration quality; ENG - engineering parameter **There might be more than one.

For monitoring purposes, a central order has been chosen on each chip. The following table gives the relation between physical order and order number as given by the pipeline (and used in the header keyword names). The pipeline order number is also recorded in the QC1 database key espresso_orderdef..pipe_centorder.

Resolution	Chip	Physical order	Pipeline order
(U)HR	BLUE	134	55
(U)HR	RED	94	47
MR	BLUE	134	28
MR	RED	94	24

Trending

The position of a central order on each chip is trended separately for the five different combinations of resolving power and binning: HR with 1x1 and 2x1 binning, UHR with 1x1 binning, and MR with 4x2 and 8x4 binning.

Scoring&thresholds Order position

Scoring is not implemented.

History

Date	event
2018-03-21	Orders shifted on blue chip after intervention.
2019-03-27	earth quake after daytime calibrations
2020-02-10	earth quake after daytime calibrations

Algorithm Order position

Pipeline calculated QC parameters.