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OmegaCAM:
Quality Control Parameters and Trending

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Instrument Properties Trended

OmegaCAM calibration data are pipeline-processed to create calibration products. The technical performance of the instrument is measured by QC1 parameters which are obtained by either pipeline procedures or QC-intrinsic python routines. All measured QC1 parameters are stored in the QC1 database. Their evolution with time is evaluated by the trending process. OmegaCAM QC1 parameters are routinely measured for all calibration and science products measured in OmegaCAM pipeline supported modes.

The plots shown here are trending plots. They show the evolution of the last 90, 180, or 365 days up to the date for which data have been processed by the pipeline in Garching. The latest date in the trending plots is usually 10 or more days behind the observing night due to the hard disk delivery times between South America and Europe. QC1 parameters of data still on their way to Europe are monitored via Health Check Plots. They are based on ftp transfer of data and are assessed within minutes.

The following properties of the OmegaCAM detector and instrument are trended:

 

  • BIAS
    • median bias level averaged over all 32 extensions (ADU)
    • median bias level for each extension (ADU)
    • standard deviation of the bias level averaged over all 32 extensions (ADU)
    • bias level for a select number of detectors (ESO_CCD #81, #82, and #83) (ADU)
    • number of hot pixels


  • READ NOISE
    • bias read-out noise averaged over all 32 extensions (ADU)
    • bias read-out noise for each extension (ADU)
    • read-out noise for a selection of four detectors (ESO_CCD #81, #82, #83, and #75) (ADU)


  • DARK
    • dark current averaged over all 32 extensions (ADU/pixel/hour)
    • dark current for each extensions (ADU/pixel/hour)
    • particle rateaveraged over all 32 extensions (particles/cm^2/hour)


  • GAIN & LINEARITY
    • GAIN:
      • the gain averaged over all 32 detectors (e-/ADU)
      • the error in the gain averaged over all 32 detectors (e-/ADU)
      • the gain for each individual detector (e-/ADU)

    • LINEARITY:
      • effective non-linearity correction averaged over all 32 detectors
      • effective non-linearity correction for each individual detector
      • flux level at which effective non-linearity correction is applied averaged over all 32 detectors (ADU)
      • number of non-linear pixels averaged over all 32 detectors
      • number of non-linear pixels for each individual detector
      • minimum/maximum median flux level used in the linearity computation averaged over all 32 detectors (ADU)
      • minimum/maximum median flux level used in the linearity computation for each individual detector (ADU)
      • fixed-pattern noise averaged over all 32 detectors (ADU)
      • fixed-pattern noise for each individual detector (ADU)


  • SHUTTER TEST
    • no health check plots are created


  • QUICK-CHECK (dome flat)
    • for each dome flat lamp (FFLS1 or FFLS2):
      • median flux level averaged over all 32 detectors (ADU)
      • median flux level for each detector (ADU)
      • standard deviation over all 32 detectors (ADU)
      • standard deviation for each detector (ADU)


  • DOME FLATS
    • for each of the filters: u_SDSS, g_SDSS, r_SDSS, i_SDSS, z_SDSS, B_JOHN, and V_JOHN:
      • raw dome flats median level averaged over all 32 detectors (ADU)
      • raw dome flat median level for each detector (ADU)
      • raw dome minimum and maximum level averaged over all 32 detectors (ADU)

    • for ALL filters (possible since the master dome flats are normalized):
      • master dome flat median level averaged over all 32 detectors (ADU)
      • master dome flat median level for each detector (ADU)
      • master dome flat rms averaged over all 32 detectors (ADU)
      • number of cold pixels averaged over all 32 detectors
      • number of cold pixels for each detector


  • TWILIGHT FLATS
    • for each of the filters: u_SDSS, g_SDSS, r_SDSS, i_SDSS, z_SDSS, B_JOHN, and V_JOHN:
      • raw twilight flats median level averaged over all 32 detectors (ADU)
      • raw twilight flat median level for each detector (ADU)
      • raw twilight minimum and maximum level averaged over all 32 detectors (ADU)

    • for ALL filters (possible since the master flats are normalized):
      • master twilight flat median level averaged over all 32 detectors (ADU)
      • master twilight flat median level for each detector (ADU)
      • master twilight flat rms averaged over all 32 detectors (ADU)
      • number of bad (hot + cold) pixels averaged over all 32 detectors
      • number of bad pixels for each detector


  • STANDARD STARS
    • for each of the filters: u_SDSS, g_SDSS, r_SDSS, i_SDSS, z_SDSS, B_JOHN, and V_JOHN:
      • zeropoint as averaged over all 32 detectors
      • zeropoint rms averaged over all 32 detectors
      • zeropoints for each individual detector

    • for each of the filters: u_SDSS, g_SDSS, r_SDSS, i_SDSS, and z_SDSS:
      • image quality plotting the stellar source FWHM vs. the corrected (for airmass and waveband) DIMM seeing (arcsec)
      • the difference in the standard star FWHM vs. the corrected DIMM seeing (arcsec)
    • for each of the filters: u_SDSS, g_SDSS, r_SDSS, i_SDSS, and z_SDSS:
      • the stellar source ellipticity (1 - b/a) averaged over all 32 detectors
      • the stellar source ellipticity rms averaged over all 32 detectors
      • the stellar source ellipticity for each individual detector

  • SCIENCE
    • no health check plots are created
    • science processing was only done between Jan. 2012 and July 2012 and has been discontinued under QC XXLight

 
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