Gain Correction

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.

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