Pyramid Simulation Ralf Ehrlich University of Virginia February

Pyramid Simulation Ralf Ehrlich University of Virginia February 13, 2019

Status Ø Currently have a basic GEANT 4 model of • A pyramid with three empty chamber (sphere with a 10 m diameter) • Empty spheres at (0, 49 m, 20 m), (0, 69 m, 0), (0, 89 m, -20 m) • The correct pyramid model will be implemented later. • The detector consisting of 6 containers placed at 25 m away from the base of the pyramid. • Container wall: 5 mm thick aluminum • Distance between left and right bank: 2 m • Length of vertical counters: 2. 4 m • Length of horizontal counters: 4. 8 m • 16 counters per module • 6 vertical modules per bank and array, 3 horizontal modules per bank and array 2/13/2019 Ralf Ehrlich - University of Virginia 2

Status GDML drawing of the GEANT 4 model y Height 138. 75 m The empty spheres inside of the pyramid are hidden. Container #3 Container #4 z 25 m Container #5 230 . 33 m Container #2 230 x . 33 m Container #1 Container #0 2/13/2019 Ralf Ehrlich - University of Virginia Containers (L: 40’, W: 8’, H: 9. 5’ ) made of 5 mm thick aluminum not shown in drawing. 3

Results of test run ØTest run setup • Used only container #1 (centered at one of the baselines of the pyramid). • Simulated 4. 8 e 9 events. • Corresponds to 2. 7 years. ØReconstruction • Use only events where only one counter per layer has hits (vertical and horizontal layer at both detector banks). • Calculate direction and location of track (at center between both detector banks). • Projected the tracks back to a vertical plane at the center of the pyramid. • Plot the projected track locations, weighted by the inverse of the scalar product between the track direction and the detector surface normal. 2/13/2019 Ralf Ehrlich - University of Virginia 4

Results of test run Ø Projection to the center of pyramid (x=0) • Using reco information from counters. • No energy cut. z[m] 2/13/2019 Ralf Ehrlich - University of Virginia 5

Results of test run Ø Projection to the center of pyramid (x=0) • Using MC information from the end of the tracks. • No energy cut. z[m] 2/13/2019 Ralf Ehrlich - University of Virginia z[m] 6

Results of test run Ø Projection to the center of pyramid (x=0) • Using reco information from counters. • Using only events where the start energy of the muon is less than 100 Ge. V. z[m] 2/13/2019 Ralf Ehrlich - University of Virginia z[m] 7

Results of test run Ø Projection to the center of pyramid (x=0) • Using MC information from the end of the tracks. • Using only events where the start energy of the muon is less than 100 Ge. V. z[m] 2/13/2019 Ralf Ehrlich - University of Virginia z[m] 8

Baseline run Ø Projection to the center of pyramid (x=0) • A run without the pyramid. • Using only events where the start energy of the muon is less than 100 Ge. V. reco z[m] MC 2/13/2019 Ralf Ehrlich - University of Virginia z[m] 9

Investigating the band features Ø Projection to the center of pyramid (x=0) • Using reco information from counters. • Using only events where the start energy of the muon is less than 100 Ge. V. • No cuts on the color scale as in previous plots. Ø Band features are due to a combination of axis binning and detector resolution 2/13/2019 5 cm/bin 1 m/bin 2 m/bin 4 m/bin Ralf Ehrlich - University of Virginia 10

Investigating the band features Ø Projection to the center of pyramid (x=0) • Using MC information from the end of the tracks. • Using only events where the start energy of the muon is less than 100 Ge. V. • No cuts on the color scale as in previous plots. Ø Band features are due to a combination of axis binning and detector resolution 2/13/2019 5 cm/bin 1 m/bin 2 m/bin 4 m/bin Ralf Ehrlich - University of Virginia 11

Reproduce the “quantized” reco plots from MC information Ø Start with the MC information (at the end of the track) to recreate the “quantized” reco plots with their finite counter widths, and project the reconstructed track to the center of the pyramid (x=0). • Using only events where the start energy of the muon is less than 100 Ge. V. • No cuts on the color scale as in previous plots. Ø 50 mm wide counters 2 m/bin 4 m/bin Ø 20 mm wide counters 2 m/bin 2/13/2019 4 m/bin Ralf Ehrlich - University of Virginia 12

Starting energies of muons which hit the detector Ø Tracks projected to area (0, 60 m± 20 m, ± 20 m) • All muons which hit the detector without pyramid present • All muons which hit the detector with pyramid present, but only muons which went through the pyramid Energy interval, where the pyramid material makes a difference E [Me. V] 2/13/2019 Ralf Ehrlich - University of Virginia 13

Muon scattering Ø Tracks projected to area (0, 80 m± 20 m, ± 20 m) Ø Muons with energies between 50 Ge. V and 100 Ge. V Angle between start and end direction 2/13/2019 Ralf Ehrlich - University of Virginia 14