Page History

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In run 898 ASIC 4 and 8 RMS is step-wise changing from ~40 to ~90 ADC units. In ASICs 7 and 14  RMS is rising with event number...

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Run 898 dark rate:

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Run 902 att=0.005

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Run 909 att=1 low gain

CSpad images for runs 898-914

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All marked pixels are removed from further analysis

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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

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Run 899 att=0.1 (dark rate is subtracted using r898)

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Run 900 att=0.02 (dark rate is subtracted using r898)

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Run 901 att=0.002 (dark rate is subtracted using r898)

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Run 902 att=0.005 (dark rate is subtracted using r898)

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Run 903 att=0.005 low gain (dark rate is subtracted using r907)

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Run 904 att=0.1 low gain (dark rate is subtracted using r907)

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Run 905 att=0.5  low gain (dark rate is subtracted using r907)

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Run 906 att=1  low gain (dark rate is subtracted using r907)

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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

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Run 909 att=1 low gain (dark rate is subtracted using r907)

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Run 910 att=1 low gain (dark rate is subtracted using r907)

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Run 911 att=1 low gain (dark rate is subtracted using r907) Detector is moved for few mm

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Run 912 att=0.1 low gain (dark rate is subtracted using r907)

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Run 913 att=0.1 low gain with wires (dark rate is subtracted using r907)

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Run 914 att=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.

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Difference between runs 904(before move) - 912(moved), both runs att = 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 (att.=0.1) gives the gain ratio High/Low = 495/66 = 7.5
Comparison of runs 902 and 903 (att.=0.05) gives the gain ratio High/Low = 26/4.5 = 5.8. So, the gain is not a lilear function of intensity...