Quality Control and
Data Processing

HC PLOTS
Bias level
RON_master
RON_det
temperature
QC1 database (advanced users): browse | plot

Bias frames are acquired daily as part of MUSE daily calibrations. The template consists of 11 input frames. As of 2017-06-14 the frames are taken in the instrumental setup WFM (WideFieldMode), AO (AdaptiveOptics mode), N_Blue-Na2 (Nominal wavelenght range with Blue Na2 filter used in AO mode), SCII1.0 (readout mode). Before then, the Bias frames were acquired in the WFM-NOAO-N_Blue mode.

Raw BIAS frame, IFU 5, This is an example of a typical raw bias frame, here, for IFU (or CHANEL) 5 (EXTNAME=CHAN05). The full bias frame contains 24 of such extensions - one extension for each of the 24 channels of MUSE.

QC1_parameters

FITS key	QC1 database: table, name	definition	class*	HC_plot**	more docu
QC.BIAS.MASTER1.MEDIAN	muse_bias..master1_median	Median value of master bias in quadrant1	HC		[docuSys coming]
QC.BIAS.MASTER2.MEDIAN	muse_bias..master2_median	Median value of master bias in quadrant2	HC		[docuSys coming]
QC.BIAS.MASTER3.MEDIAN	muse_bias..master3_median	Median value of master bias in quadrant3	HC		[docuSys coming]
QC.BIAS.MASTER4.MEDIAN	muse_bias..master4_median	Median value of master bias in quadrant4	HC		[docuSys coming]
*Class: KPI - instrument performance; HC - instrument health; CAL - calibration quality; ENG - engineering parameter **There might be more than one.

Trending

The bias median level is trended for each quadrant (different read-out port), for each detector separately.

Scoring&thresholds BIAS level

No scoring

History

Date	event
February 2014	Bias calibrations are taken regularly
June 2014	With change of the pipeline version (from muse_0.15 to muse_0.18) calculation of the bias median was modified. The level is determined after subtracting overscan (overscan is fitted first then subtracted).The values changed from around 1200 ADU to 0.05 ADU.
2015-03-31	CHAN01 detector vessel exchanged, DET.CHIP.ID changed from psyche to egeria
2015-11-26	The preamp cables were changed by new ones sent from Garching. Jump in BIAS_median. PPRS-063595

Algorithm BIAS level

The master bias is combined over several (11) input frames. The median level of the master bias is calculated for each quadrant (independent read-out ports), per detector (i.e. channel/IFU).

Several separate bias images are combined into one master bias file. The master bias contains the combined pixel values, in ADU, of the raw bias exposures, with respect to the image combination method used (sigclip). Processing trims the raw data and records the overscan statistics, corrects the data levels using the overscan (if overscan is not "none") and combines the exposures using input parameters. The read-out noise is computed for each quadrant of the master bias for each detector (IFU).

QC1_parameters

FITS key	QC1 database: table, name	definition	class*	HC_plot**	more docu
QC.BIAS.MASTER1.RON	muse_bias..master1_ron	[e-] Read-out noise in quadrant1	HC		[docuSys coming]
QC.BIAS.MASTER2.RON	muse_bias..master2_ron	[e-] Read-out noise in quadrant2	HC		[docuSys coming]
QC.BIAS.MASTER3.RON	muse_bias..master3_ron	[e-] Read-out noise in quadrant3	HC		[docuSys coming]
QC.BIAS.MASTER4.RON	muse_bias..master4_ron	[e-] Read-out noise in quadrant4	HC		[docuSys coming]
QC.BIAS.MASTER1.RONERR	muse_bias..master1_ronerr	[e-] Read-out noise error in quadrant1	HC		[docuSys coming]
QC.BIAS.MASTER2.RONERR	muse_bias..master2_ronerr	[e-] Read-out noise error in quadrant2	HC		[docuSys coming]
QC.BIAS.MASTER3.RONERR	muse_bias..master3_ronerr	[e-] Read-out noise error in quadrant3	HC		[docuSys coming]
QC.BIAS.MASTER4.RONERR	muse_bias..master4_ronerr	[e-] Read-out noise error in quadrant4	HC		[docuSys coming]
*Class: KPI - instrument performance; HC - instrument health; CAL - calibration quality; ENG - engineering parameter **There might be more than one.

Algorithm Read noise (master)

Read-out noise in quadrant n (n=1,2,3,4) is determined from difference images of each adjacent pair of biases in the input dataset in randomly placed windows.

Trending

Read-out noise is trended for each quadrant and each IFU (detector). Only data taken with read-out mode SCI1.0 are selected. Plot RON_master shows the average and the standard deviation for each quadrant across all 24 IFUs (detectors) as a quick overview of the global behaviour. The other plot, RON_det, shows read-out-noise in each quadrant in each detector.

Scoring&thresholds Read noise (master)

The read-out-noise per quadrant, averaged over all the detectors, is tightly scored, with dynamic thresholds following the median average.

History

Date	event
February 2014	bias calibrations are taken regularly
2015-03-31	CHAN01 detector vessel exchanged, DET.CHIP.ID changed from psyche to egeria
2015-10-31	After intervention (detectors warmed up and vacuum recreated in the transfer lines) improved RON values in almost all channels/quadrants; The worst degradation is in channel 23 which shows a higher RON by 6%; The largest improvement is in channel 20 by 14%. PPRS-063339
2015-11-26	The preamp cables were changed by new ones sent from Garching. RON improved. PPRS-063595

The MUSE BIAS frames contain information about temperature of each detector. This is monitored.

QC1_parameters

FITS key	QC1 database: table, name	definition	class*	HC_plot**	more docu
INS.TEMP.VALn	muse_bias..temp_det		HC		[docuSys coming]
*Class: KPI - instrument performance; HC - instrument health; CAL - calibration quality; ENG - engineering parameter **There might be more than one.

Trending

Temperature is extracted from the header master bias product (keywords: INS.TEMP.VAL). It is trended for each IFU detector.

History

Temperature of all the detectors is very stable with time.

Scoring&thresholds Bias detector temperature

Detectors' temperature is not scored.

Algorithm Bias detector temperature

No algorithm applied.