Hi Jens Ivar Thanks for your quick comments. > 1. > What do you mean with "Normalized average ADC"? Is it average integrated > or max ADC from clusters, or ADCs at the sequence level? And normalized > to what? > This is the average integrated ADC for a pad. The normalisation factor is found by averaging over all rows and pads where there are signals. There might be additional information to get from the max ADC. > 2. > Cutting 4 pads on either end of each pad row seems somewhat harsh. By > looking e.g. at TPC pedestals pads 2, 3, n-4 and n-3 are typically not > that noisy. Often even pads 1 and n-2 are ok. Also, cutting pads 0-3 has > implications for cluster/hit reconstruction from pads 4++. So > effectively it may very well be that you cut into the acceptance of the > TPCs by disabling the 4 outermost pads on either end. > I agree with you. This is probably to harsh. The cut was done to eliminate noisy pads in T2 and as a first approach. > 3. > Your limits for hot and cold pads seem ok. You clearly get rid of some > pads that are not useful. > > 4. > Your time correction as function of row number is very nice, but as has > been shown earlier it is not the full picture. There is also some pad > number dependence for the time correction. Do you envision probing this > dependence also? > I don't think I will investigate this the next 2 months. There have also been some talk here, if you could use the time distribution of each pad, where you should see the "top" and "bottom" of the TPC to map out these corrections, do you know/think this is a good idea ? > 5. > Just to make it sure, did you use v_drift = 1.8 cm/us in the TPCs when > investigating the drift velocity? When a thorough survey of the detector > setup has been done after the proton run one can really get the full > picture of the drift velocity using the fibers. > I use the default, which I believe was 1.6 at that time, so that you have to divide by the slope (~0.9) to get the true drift velocity. Cheers Peter
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