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Florida Institute of Technology Melbourne, Florida

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. Florida Institute of Technology Melbourne, Florida. FIT SPS Chapter

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Florida Institute of Technology Melbourne, Florida

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  1. 2010 SPS Zone 6 Conference atFlorida International UniversityMonte Carlo simulations of a first prototype micropattern gas detector system used for muon tomographyJ. 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 Quarknet Particle Detector Construction Open Science Grid Computing Cluster Pictures from the FIT HEP archives.

  4. What are Muons? • Muons are leptons. • Symbols: • Muon = μ- • Antimuon = μ+ • Similar to electrons, but 200 times more massive: • Muon mass = 0.106 GeV/c2 • Electron mass = 0.000501 GeV/c2 • Muon charge = -1 e • Interact weakly with matter. [No Photograph Available]

  5. Where Do Muons Come From? p+ (or other high-energy cosmic ray) Nuclear reaction (not chemical) Nucleus π- π+ Energy and other particles μ- μ+ *Not to scale. Picture from NASA Goddard Space Flight Center.

  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/m2/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 3 Pictures from the FIT HEP archive, CERN Courier, and DESY Labs.

  8. Muon Tomography Concept μ- Muon Detector θ = Scattering Angle High θ⇒ High-Z Material (x,y) of detector hits U, Pb, etc. Scattering Point (x,y,z) of detector hits θ 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.

  10. Monte Carlo Simulations Targets (U, Pb, etc.) Engine Scattering Angle [degrees] Position (x,y,z) [mm] Pictures from the FIT HEP archives.

  11. Prototype Muon Tomography System 30x30 cm2 GEM Detectors (Only 5x5 cm2 Used) 3x3x2 cm3 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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