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| QC
PLOTS |
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CURRENT |
HISTORY |
| resolution |
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| dispersion
rms |
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| QC1
database (advanced users): browse
| plot
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Click on CURRENT
to see the current trending (Health Check).
Click on HISTORY
to see the historical evolution of the trending. |
| top
Wavelength
calibration parameters |
Parameters are measured for each quadrant
and for all six grisms separately.
QC1 parameters
| parameter |
QC1 database: table, name
|
procedure |
| resolution |
vimos_mos_wave, resol1
vimos_mos_wave, resol2
vimos_mos_wave, resol3 |
R = lambda/delta lambda. The spectral resolution
is computed for each grism using three selected arc lamp lines with
wavelengths close to the center, close to the red, and close to the
blue end of the spectrum. The resolution is given by the average on
all slits of the ratio between the selected arc lamp line wavelength
and its FWHM (Gauss fit). |
| dispersion rms |
vimos_mos_wave, ids_rms |
rms of the inverse dispersion
solution residuals in pixels. The residuals are the differences between
the expected line positions and the actual line positions after applying
the dispersion solution. |
Trending
For the QC1 database (and for trending), MOS arc lamp
calibrations are only considered if they are measured for calibrating
science data. Results for calibrating standard star exposures differ significantly
and are disregarded.
History
| date |
event |
| 2010-07 |
new MOS pipeline is applied; wavelength calibration is dramatically improved |
| 2010-07 |
tilt of focal plane vs. detector plane, upper part of quadrant 4 is out of focus |
| 2011-05 |
tilt of focal plane is fixed |
| 2017-08, etc. |
some masks in quadrant 1 for a large programme were designed so that an arc line of the 2nd multiplex falls on the detector edge; that led to an artificially increased value for the dispersion RMS although the wavelength calibration is fine |
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