Last updated : 30/Jan/2006
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+ SDD2 noise cut
It is over killing to cut the sdd2 noise by sdd1 scaler events (reset and upper). Some bias must be considered when cutting. Is there a more reasonable method to cut the noise ?

+ Excess in between Ka and Kb
really the excess is caused by pile-up? It could be noise ? Try to fit with an exponential structure for noise (pedestal), the integral of the exponential is same for Ti and Ni, its width depends on the resolution. Evaluate the mean shift. If we want to see the pile-up events we must to check the flush ADC data.

+ Pedestal
the pedestal of the comparator PH-ADC has some shifts also. Compare the shift to gain drift or mean shift. *the pedestal of PH-ADC corresponds to the max height of noise.