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La Silla - Science Operation Department
SciOp
CES Stability Monitoring
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Stability measurements

With regular intervals the stability of the instrument is monitored. An arc spectrum is taken with regular intervals during (typically) half a day, and the movements in dispersion and cross-dispersion directions are measured. In the table below, the shifts are calculated from the part of the curve with the fastest change rate, hence represents a "worst case". Recent measurements are accompanied by plots. All measurements were made at 539.5nm.
Date Shift [px/hr] Duration plot?

dispersion cross-disp. [hr]
2001-08-01 0.017 0.214 11.67
2001-10-21 0.033 0.087 11.36
2001-11-10 0.014 0.205 43.27
2003-01-12 0.059 0.092 10.00 plot
2003-09-27 0.042 0.227 13.67 dispersion
cross-disp.
2003-09-28 0.046 0.075 13.67 dispersion
cross-disp.
2003-10-02 0.059 0.086 9.72 dispersion
cross-disp.


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Last update: Oct 5, 2003
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