Page History
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Run 898 dark rate for high gain mode; plor shows the dark rate difference between low and high gain r898-907
Run 899
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transm=0.1 (dark rate is subtracted using r898)
Run 900
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transm=0.02 (dark rate is subtracted using r898)
Run 901
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transm=0.002 (dark rate is subtracted using r898)
Run 902
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transm=0.005 (dark rate is subtracted using r898)
Run 903
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transm=0.005 low gain (dark rate is subtracted using r907)
Run 904
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transm=0.1 low gain (dark rate is subtracted using r907)
Run 905
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transm=0.5 low gain (dark rate is subtracted using r907)
Run 906
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transm=1 low gain (dark rate is subtracted using r907)
Run 907 dark image for low gain
run 908 dark image for low gain (dark rate is subtracted using r907) Difference between two dark rate images
Run 909
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transm=1 low gain (dark rate is subtracted using r907)
Run 910
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transm=1 low gain (dark rate is subtracted using r907)
Run 911
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transm=1 low gain (dark rate is subtracted using r907) Detector is moved for few mm
Run 912
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transm=0.1 low gain (dark rate is subtracted using r907)
Run 913
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transm=0.1 low gain with wires (dark rate is subtracted using r907)
Run 914
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transm=0.1 low gain with wires (dark rate is subtracted using r907)
We use configuration parameters from microscopic (optical) measurement. It is clear that this configuration parameters are not perfect for real detector; some of 2x1are significantly ~1mm moved w.r.t. microscopic (optical) measurement.
<- NON tilted 2x1 
<-Tilted 2x1
Manipulation with images
Difference between runs 904(before move) - 912(moved), both runs
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transm = 0.1
The difference between the original and moved image is relatively small ~2.5% of signal, but everything is done in low gain mode, where we actually have ~30 photons / pixel.
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Run numbers are shown in histogram titles:
The difference between dark image amplitudes at High and Low gain mode is ~155 ADC units.
Comparison of runs 899 and 904 (atttransm.=0.1) gives the gain ratio High/Low = 495/66 = 7.5
Comparison of runs 902 and 903 (atttransm.=0.05) gives the gain ratio High/Low = 26/4.5 = 5.8. So, the gain is not a lilear function of intensity...
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