1. Late shower start in HCAL stack Peter Speckmayer 6/29/20101Peter Speckmayer, LCD weekly

2. Late shower start History: – once upon a time... we had a layer numbering problem. HCAL stack layer number were reversed (first layer  highest number) sometimes incorrect reversing of layer numbers – shortenes artificially the HCAL (some layers not taken into account) – has been fixed then change in geometryconverter  layers start with No. 0 6/29/2010Peter Speckmayer, LCD weekly2

3. Late shower start 2 Detected similar problem again – not related to old (and fixed) bug – but same symptoms 6/29/2010Peter Speckmayer, LCD weekly3

4. late start/ example 6/29/20104Peter Speckmayer, LCD weekly

5. late start/ example 6/29/20105Peter Speckmayer, LCD weekly

6. late start/ example 6/29/20106Peter Speckmayer, LCD weekly

7. Tracking region compact.xml:  Define layers of HCAL (material, thickness), define number of layers, define center of HCAL  HCAL center differs for different set ups lcdd:  Tracking region reaches into Calorimeter  no calorimeter hits from impinging particle while in tracking region  but calorimeter hits from back-scattered particles 6/29/20107Peter Speckmayer, LCD weekly

8. Tracking region solution so far: – reduce tracking region to 1 cm in z – re-submitted all simulations with corrected tracking region next step: reconstruction, creating ROOT-trees then: training of neural net this time: want to go down to 3 lambda (up to now: 6 lambda) wait for detailed explanation about tracking region 6/29/2010Peter Speckmayer, LCD weekly8

9. After shortening of tracking region 6/29/20109Peter Speckmayer, LCD weekly

10. 6/29/201010Peter Speckmayer, LCD weekly

11. Wrong/correct samples wrong (material, thickness) W-steel20 Steel-W20 Steel20, 10 W20 correct (material, thickness) W-steel15, 10 Steel-W15, 10 steel30, 25, 15 W05, 10, 15 6/29/201011Peter Speckmayer, LCD weekly

12. Summary some HCAL stacks wrong problem found re-simulate ALL stacks (on the grid) – reconstruct down to 3 lambda 6/29/2010Peter Speckmayer, LCD weekly12