Preliminary Results on Non-Projective HCal Simulations

04/22/23

Guilherme Lima, DHCal Meeting 1

Preliminary Results on Non-Projective HCal Simulations

Dhiman Chakraborty, Guilherme Lima, Jeremy McCormick, Vishnu Zutshi

NICADD / Northern Illinois University

04/22/23 Guilherme Lima, DHCal Meeting 2

Status SummaryLast week overview, status and plans for short

and medium termToday – Non-projective Hcal geometry– Geometry initialization– Preliminary results–…

04/22/23 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

04/22/23 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.

04/22/23 Guilherme Lima, DHCal Meeting 5

First version of NP simulatorBased on (projective) LCDG4Fixed 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

04/22/23 Guilherme Lima, DHCal Meeting 6

Preliminary testsUse single particles:– Muons, pions and electrons– Fixed directions in space– Different energies (2,5,10,20,30,50 GeV)

Absolute energy depositionComparison with projective geometry – Same energy deposition per layer– Number of hit cells reasonably scales with

inverse of cell area (pions)Complex physics events

04/22/23 Guilherme Lima, DHCal Meeting 7

Energy in ECal absorberEstimate approx 8.7 MeV for a MIP

Energy (MeV)

# entries

04/22/23 Guilherme Lima, DHCal Meeting 8

Estimate approx 0.2 MeV for a MIP

Energy (MeV)

# entries

Energy in Ecal sensors

04/22/23 Guilherme Lima, DHCal Meeting 9

Energy in HCal absorber

Estimated about 31 MeV for a MIP

10 GeV Muons

50 GeV pions

04/22/23 Guilherme Lima, DHCal Meeting 10

Energy in HCal sensitive layers

Estimated about2.4 MeV for a MIP

04/22/23 Guilherme Lima, DHCal Meeting 11

Number of hits in ECal

04/22/23 Guilherme Lima, DHCal Meeting 12

Number of hits in HCal

04/22/23 Guilherme Lima, DHCal Meeting 13

Comparison to LCDG4proj and GISMO

04/22/23 Guilherme Lima, DHCal Meeting 14

Hit distributions per layer

HCal

ECal

04/22/23 Guilherme Lima, DHCal Meeting 15

Last layers hit in each event

50 GeV pions

04/22/23 Guilherme Lima, DHCal Meeting 16

Total energy per layer(comparison to LCDG4proj and GISMO)Energy (MeV)

Layer

50 GeV pions

04/22/23 Guilherme Lima, DHCal Meeting 17

Total energy(based on GISMO sampling fractions)

04/22/23 Guilherme Lima, DHCal Meeting 18

Checking EM sampling fraction

Based on GISMO sampling fractions(a reevaluation is needed!)

04/22/23 Guilherme Lima, DHCal Meeting 19

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…(?)