1. Preliminary Results on Non-Projective HCal Simulations
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Preliminary Results on Non-Projective HCal Simulations
Dhiman Chakraborty, Guilherme Lima, Jeremy McCormick, Vishnu Zutshi
NICADD / Northern Illinois University
11/29/2018
Guilherme Lima, DHCal Meeting

2. Guilherme Lima, DHCal Meeting
Status Summary
Last week
overview, status and plans for short and medium term
Today
Non-projective Hcal geometry
Geometry initialization
Preliminary results …
11/29/2018
Guilherme Lima, DHCal Meeting

3. Why a non-projective HadCal?
A projective geometry is
easy to analyze (cal towers)
easy to find cell neighbors, cones
But it also
needs many different cell sizes
may have cells too big at outer layers
cells may be too large at lower angles
11/29/2018
Guilherme Lima, DHCal Meeting

4. Why a non-projective HCal?
Fabricating a small number of cell sizes is simpler, cheaper and maybe even better…
Small cell sizes are nice for a digital calorimeter, but too many small cells may become a nightmare:
Hot cells / dead cells
Space for readout
Cost per channel
Simulations are helpful to adjust cell dimensions in order to maximize performance/cost ratio.
11/29/2018
Guilherme Lima, DHCal Meeting

5. First version of NP simulator
Based on (projective) LCDG4
Fixed cell sizes (rectangular for now)
User provides cell dimensions, and simulator makes slight adjusts (few %) for integral numbers of cells along z, 
Only HCal for now, but plans for ECal
11/29/2018
Guilherme Lima, DHCal Meeting

6. Guilherme Lima, DHCal Meeting
Preliminary tests
Use single particles:
Muons, pions and electrons
Fixed directions in space
Different energies (2,5,10,20,30,50 GeV)
Absolute energy deposition
Comparison with projective geometry
Same energy deposition per layer
Number of hit cells reasonably scales with inverse of cell area (pions)
Complex physics events
11/29/2018
Guilherme Lima, DHCal Meeting

7. Energy in ECal absorber
Estimate approx 8.7 MeV for a MIP
# entries
Energy (MeV)
11/29/2018
Guilherme Lima, DHCal Meeting

8. Guilherme Lima, DHCal Meeting
Energy in Ecal sensors
Estimate approx 0.2 MeV for a MIP
# entries
Energy (MeV)
11/29/2018
Guilherme Lima, DHCal Meeting

9. Energy in HCal absorber
Estimated about
31 MeV for a MIP
10 GeV Muons
50 GeV pions
11/29/2018
Guilherme Lima, DHCal Meeting

10. Energy in HCal sensitive layers
Estimated about
2.4 MeV for a MIP
11/29/2018
Guilherme Lima, DHCal Meeting

11. Guilherme Lima, DHCal Meeting
Number of hits in ECal
11/29/2018
Guilherme Lima, DHCal Meeting

12. Guilherme Lima, DHCal Meeting
Number of hits in HCal
11/29/2018
Guilherme Lima, DHCal Meeting

13. Comparison to LCDG4proj and GISMO
11/29/2018
Guilherme Lima, DHCal Meeting

14. Hit distributions per layer
ECal
HCal
11/29/2018
Guilherme Lima, DHCal Meeting

15. Last layers hit in each event
50 GeV pions
11/29/2018
Guilherme Lima, DHCal Meeting

16. Total energy per layer (comparison to LCDG4proj and GISMO)
50 GeV pions
Energy (MeV)
Layer
11/29/2018
Guilherme Lima, DHCal Meeting

17. Total energy (based on GISMO sampling fractions)
11/29/2018
Guilherme Lima, DHCal Meeting

18. Checking EM sampling fraction
Based on GISMO sampling fractions
(a reevaluation is needed!)
11/29/2018
Guilherme Lima, DHCal Meeting

19. Guilherme Lima, DHCal Meeting
Conclusions
JAS3 analysis classes available* for general use
Preliminary results look very encouraging
Projective vs. non-projective values for energy depositions per layer are in good agreement
Sampling fractions need to be reevaluated
Next steps include:
replace SDJan03 for SDMar01
analyze complex physics events in NP geometry (Vishnu?)
extend NP geometry into EMCal
use hexagonal cells
whatever else is necessary to certify NP simulation…(?)
11/29/2018
Guilherme Lima, DHCal Meeting