Monte Carlo simulations of a first prototype micropattern gas detector system used for muon tomography
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1 2010 SPS Zone 6 Conference at Florida International University Monte Carlo simulations of a first prototype micropattern gas detector system used for muon tomography J. B. Locke, K. Gnanvo, and M. Hohlmann
2 Florida Institute of Technology Melbourne, Florida FIT SPS Chapter Chartered 22 April 1968 FIT High Energy Physics (FIT HEP) Research Group Pictures from FIT HEP archives, National SPS, Florida Institute of Technology, and the US Census Bureau.
3 High Energy Physics Research at FIT CMS at LHC Experiment Search for the Z Boson Muon Tomography Simulation Particle Detector Construction Quarknet Open Science Grid Computing Cluster Pictures from the FIT HEP archives.
4 Muons are leptons. What are Muons? Symbols: Muon = μ - Antimuon = μ + [No Photograph Available] Similar to electrons, but 200 times more massive: Muon mass = GeV/c 2 Electron mass = GeV/c 2 Muon charge = -1 e Interact weakly with matter.
5 Where Do Muons Come From? Nuclear reaction (not chemical) p + (or other high-energy cosmic ray) Nucleus π - π + μ - Energy and other particles μ + Picture from NASA Goddard Space Flight Center. *Not to scale.
6 Important Numbers Average muon energy at sea level: 4 GeV Modal muon energy at sea level: 1 GeV Muon flux at sea level: 10,000 muons/m 2 /min Smallest prime number: 2
7 Micropattern Gas Electron Multiplier (GEM) Detector 1. A high-energy muon ionizes the gas in the detector. 2. The free electrons are channeled through the microperferations (~50 μm) due to the electric field. 3. A readout plane gathers the electrons. 2 1 Pictures from the FIT HEP archive, CERN Courier, and DESY Labs. 3
8 Muon Tomography Concept μ - Muon Detector θ = Scattering Angle High θ High-Z Material (x,y) of detector hits Scattering Point θ U, Pb, etc. (x,y,z) of detector hits Data Analysis Pictures from Microsoft Clipart.
9 Muon Tomography Applications Investigate trucks with the drivers inside. Easily locate high-z contraband (Uranium, Plutonium, etc.). Maybe medical applications when technology improves.
![) Engine Position (x,y,z) [mm]](/docs-images/95/122848800/images/10-1.jpg "Scattering Angle [degrees]")
10 Monte Carlo Simulations Targets (U, Pb, etc.) Engine Position (x,y,z) [mm] Scattering Angle [degrees] Pictures from the FIT HEP archives.
11 Prototype Muon Tomography System 30x30 cm 2 GEM Detectors (Only 5x5 cm 2 Used) 3x3x2 cm 3 Pb Block Target Support GEM Detectors Picture from the FIT HEP archives.
12 Pb Box Simulation Results 24 hours exposure to natural muon flux. No points are cut from the data. Position (x,y,z) [mm] Scattering Angle [degrees] Picture from the FIT HEP archives.
13 Empty Detector Simulation Results 24 hours exposure to natural muon flux. Position (x,y,z) [mm] Scattering Angle [degrees] Picture from the FIT HEP archives.
14 Pb Box Simulation Results 24 hours exposure to natural muon flux. Scattering angles less than 0.12 are cut from the data. Position (x,y,z) [mm] Scattering Angle [degrees] Picture from the FIT HEP archives.
15 Pb Box Simulation Results 5 mm z 15 mm Mean Scattering Angle in Voxel [degrees] Picture from the FIT HEP archives.
16 Pb Box Simulation Results -5 mm z 5 mm Mean Scattering Angle in Voxel [degrees] Picture from the FIT HEP archives.
17 Simulation Results 75 mm z 85 mm Mean Scattering Angle in Voxel [degrees] Picture from the FIT HEP archives.
18 Simulation Results -85 mm z -75 mm Mean Scattering Angle in Voxel [degrees] Picture from the FIT HEP archives.
19 Current and Future Work Analyze data from the GEM detector system prototype. Construct a GEM detector system with a more efficient geometry and 8 to 12 detectors. Continue Monte Carlo simulations for various GEM detector system geometries. Picture from FIT HEP Archives (Lenny Grasso).
20 Pictures from National SPS, Florida Institute of Technology, LucasArts, NASA Goddard Space Flight Center, and the FIT Ortega Telescope.
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