Relation between Hitpattern and Lightmap

Lets say we have a calibration source Rn222 (or any other), then from the z dependency we know that we get a skewed scintillation count for events originating at different source positions even if they had same event energy. Say it produces 100 photons in source positions, but depending on what p art of the TPC was the source, we get different count (sum of all the counts of all SiPM). To get the true count, we will have lightmap calibration and have some scale factor to compensate for the geometry (or may be other factors).

So we know that for any calibration data, the count registered by the SiPM is not the true count and we need some compensation factor. Since we use the calibration data for hitpattern, if we do not compensate first for the lightmap variation we would be using wrong count for each SiPM.

• If we use this data for hitpattern model then the fast-light generated with this hitpattern model will have to be recalibrated by lightmap.

But for position reconstruction, since the hitpattern was trained with ‘faulty’ photon counts, … … …

• But I realize, lightmap calibration is only affecting the intensity and we won’t have any changes in the SiPM ids, which is what we are concerned in hitpattern, it won’t have effect on position reconstruction too. ::::