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Bias stability | ||
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Bias instabilities are of 2 kinds : | ||
1) ITL bias jumps | ||
2) e2v 2D shapes. | ||
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#. ITL bias jumps | ||
#. e2v 2D shapes. | ||
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Both observed in Run 6 and deeply studied. Issue 1 considered as hardware-level issue, tried to mitigate issue 2 by acquisition optimization in Run 7. | ||
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For the baseline configuration (see conclusion), three stability runs were recorded : | ||
1) Run E2136 : 15-s darks with long delays | ||
2) Run E2236 : 50 15-s darks, 50 biases | ||
3) Run E2330 : 15-s and 30-s darks with delays | ||
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#. Run E2136 : 15-s darks with long delays | ||
#. Run E2236 : 50 15-s darks, 50 biases | ||
#. Run E2330 : 15-s and 30-s darks with delays | ||
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eo_pipe bias stability task : bias + serial overscan correction, mean of the image | ||
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Plots: | ||
1) Examples : 1 stable CCD / 1 instable CCD | ||
2) Instable CCD : comparison of the 3 runs | ||
3) Some yellow corner images (bias, 15-s exposure, 30-s exposure) | ||
4) Mosaic of stability metric | ||
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#. Examples : 1 stable CCD / 1 instable CCD | ||
#. Instable CCD : comparison of the 3 runs | ||
#. Some yellow corner images (bias, 15-s exposure, 30-s exposure) | ||
#. Mosaic of stability metric | ||
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Discussion about the possible mitigation strategies |