Gain Correction Factors
Definition
- The gain correction factor is defined for images averaged over 100 events for good pixels as
g(i,j) = <Amplitude in ASIC> / Amplitude(i,j),
where i and j are the pixel indexes in ASIC. - The gain correction factor is set to "0" for bad pixels.
The gain correction factors for runs 901, 902, and low gain 903, 904, 905, and 906
with transmission 0.002, 0.005, 0.005, 0.1, 0.5, 1, respectively
Gain correction factor distribution over quad-2 pixels in different runs
Amplitude spectra with corrected gain
Run 901, trans.=0.002
- Spectrum is shown for events 1,11,21,31, and 41, respectively.
- The gain correction factor is set to "0" for bad pixels. This explains the one-bin peak at "0" amplitude.
Run 902, trans.=0.005
- Spectrum is shown for events 1,11,21,31, and 41, respectively.
- The gain correction factor is set to "0" for bad pixels. This explains the one-bin peak at "0" amplitude.
Run 900, trans.=0.02
- Spectrum is shown for events 1,11,21,31, and 41, respectively.
- Fit is not applied because peaks are not distinguished
Run 900, trans.=0.02 WITHOUT GAIN CORRECTION:
Conclusion
- Gain factors have the RMS spread ~5-10% depending on high/low-gain mode and intensity of illumination
- There is no significant improvements of the amplitude spectrum after the gain correction is applied
Overview
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