diff --git a/sections/biasStability.rst b/sections/biasStability.rst index 79857b6..2c7df1e 100644 --- a/sections/biasStability.rst +++ b/sections/biasStability.rst @@ -1,22 +1,25 @@ Bias stability ############################################ Bias instabilities are of 2 kinds : -1) ITL bias jumps -2) e2v 2D shapes. + +#. ITL bias jumps +#. e2v 2D shapes. 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. 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 + +#. 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 eo_pipe bias stability task : bias + serial overscan correction, mean of the image 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 + +#. 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 Discussion about the possible mitigation strategies