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GIRAFFE Quality Control:
wavelength solution

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QUALITY CONTROL
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GIRAFFE QC
Trending & QC1
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GIRAFFE ...
QC links:
residual RMS | number of lines | resolution
 
QC PLOTS
  CURRENT HISTORY
residual RMS:
number of lines :
resolution:
QC1 database (advanced users): browse | plot
   Click on CURRENT to see the current trending (Health Check).
   Click on HISTORY to see the historical evolution of the trending.


The quality of the dispersion solution depends on the quality of the arclamp exposure and of the pipeline recipe. The arclamp exposure is quality-controlled in the arclamp plot. The results of the pipeline recipe are monitored here, in terms of three parameters:

  • residual rms
  • number of detected emission lines
  • resolution.
top Residual RMS

The arc lamp data are measured in a pattern involving two health check settings: the high-resolution H525.8B setup, and the low-resolution L543.1 setup. The former is measured in every slit system, the latter only in the two Medusa's. The pattern repeats every week.

QC1 parameters

The QC1 parameter rms_fit (PRO.WSOL.RMS) describes the rms of the residuals of the accepted line positions against the dispersion solution.

parameter QC1 database: table, name procedure
mean residual per fibre in pixel giraffe_wave..rms_fit - identify and accept the emission lines from the arclamp per fibre;
- measure their position;
- fit a polynomial;
- calculate the residuals against this fit

Trending

The trending plot monitors the HC data taken in high resolution (H525.8B, upper panel) and low resolution (L543.1, Medusa1 and 2 only, lower panel).

History

date event
around 2008-01-14 Low flux observed, due to bad positioning of the calibration mirror located inside of the OzPoz calibration unit
2010-07-13...24 problems with gripper, calibration no flux

top Number of lines

This parameter is derived by the pipeline from the same set of Health Check data as the residual RMS: arclamp file in high resolution (H525.8B) and low resolution (L543.1, Medusa1 and 2 only).

QC1 parameter

parameter QC1 database: table, name procedure
PRO.WSOL.NLINES: number of accepted emission lines per fibre in the wavelength solution giraffe_wave..nlin_acc number of identified and accepted emission lines, per fibre

Note that the ops log data contain only the parameter PRO.WSOL.NLINES which measures the nominal number of lines per fibre, before acceptance. This value is usually slightly higher than nlin_acc.

Trending

The upper panel of the trending plot
shows the number of accepted lines for the HC settings for high resolution:

Boxes 1-5: Number of accepted lines, high-resolution setting H525.8B.

Plots 6-7 show the results for the HC settings for the low resolution grating:

Boxes 6,7: Number of accepted lines, low-resolution setting L543.3 and Medusa1/2.

For the other settings, this parameter varies strongly. Therefore it is not possible to provde a trending for each individual setup, but there are three plots which monitor the chromatic dependence of nlin_acc:

Boxes 8-10: Number of accepted lines vs. central wavelength; high-resolution settings (all Medusa1/2); high-resolution settings (all IFU1/2 and Argus); low-resolution settings (all Medusa1/2).

History

date event
around 2007-10-01 arclamp flux strongly decreased due to gripper problem; this resulted in a loss of some of the weaker emission lines, nlin_acc dropped.
around 2008-01-14 Low flux observed, due to bad positioning of the calibration mirror located inside of the OzPoz calibration unit
2010-07-13...24 problems with gripper, calibration no flux

topResolution

The resolution of the GIRAFFE arclamp calibration data is currently monitored by measuring the width of the identified and accepted arc emission lines. The QC1 parameter mean_resol in pixels describes the fibre-averaged width of the emission lines.

There are currently no ops log data for this parameter.

QC1 parameters

parameter QC1 database: table, name procedure
emission line width giraffe_wave..mean_resol mean resolution (FWHM in pixels) of the emission lines

Trending

The upper panel of the trending plot monitors the HC data taken in high resolution (H525.8B, all five fibre systems), the lower panel those for low resolution (L543.1, Medusa1 and 2 only).

History

date event
around 2008-01-14 Low flux observed, due to bad positioning of the calibration mirror located inside of the OzPoz calibration unit
2010-07-13...24 problems with gripper, calibration no flux

 
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