1 / 9

MCP-PET: Geant4 Simulation

MCP-PET: Geant4 Simulation. Geometry Implementations 1. Similar to the last report (polished surface). Scintillator : LSO, LaBr3 # of layers : 5 -> 4 Area : 51x51mm -> 102x102mm 2. Wavelength shift plastics/optical fiber

elan
Download Presentation

MCP-PET: Geant4 Simulation

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. MCP-PET: Geant4 Simulation • Geometry Implementations 1. Similar to the last report (polished surface). Scintillator : LSO, LaBr3 # of layers : 5 -> 4 Area : 51x51mm -> 102x102mm 2. Wavelength shift plastics/optical fiber Collect light on the side wall of X-tal. Need input parameters for WLS plastics. e.g) refractive index, absorption length, emission spectrum, .. • Surface condition( Ground -> Polished) for total internal reflection.

  2. Layer 1 Layer 2 Layer 3 Layer 4 N. B.: NOT TO SCALE C R Y S T A L C R Y S T A L C R Y S T A L C R Y S T A L Sample Crystal MPC Wave Shifter Bar + Fiber Optic Legend Transmission Line Anode MCP 4a MCP 1a MCP 2a MCP 2b MCP 3a MCP 3b MCP 1b MCP 4b Photocathode MCP Channel plates Transmission Lines Wave-Form Sampling Electronics Wave Shifter + Fiber Optic 4-Layer Micro-Pet Sampling Calorimeter Wave-Form Sampling Electronics

  3. Emission Spectra(input to geant4) LSO LaBr3 MCP Q.E(Burle Planacon) nm nm nm

  4. Emission Spectra(geant4 output) nm nm LaBr3 LSO Emission spectra of LSO, LaBr3 Before/After MCP Q.E applied

  5. # of photoelectron at photo-cathode # of p.e ( LSO) LaBr3 • # of p.e at 1st lalyer • Sum of 2 sides( front and back) • 371 for LSO • 976 for LaBr3( ~2.6 times larger than LSO) • LaBr3 has more compton scattering events.

  6. Hit layer(1,2,3,4) 1 2 3 4 layer LaBr3 LSO Shows that LSO has higher stopping power than LaBr3.

  7. Detection Efficiency ? LaBr3 # of photo-electron(LSO): sum of 4 layers • Requiring • # of photo-electron > 50. • Mutiple layers can • have hits in an events. • ( by compton scattering)

  8. Light spread( at photo-cathode) mm mm X of p.e ( Single event) RMS of the X spread Light spread : RMS ~ 4.5mm Consistent with simple calculation: crystal length : 10mm rindex : 1.82(LSO) -> 1.00 critical anlge : 33.3 deg 10mm*tan(33.3) = 6.5mm X of p.e ( all the first layer hits)

  9. Plans • Investigate material effects 4mm of T-Line width. • Extract Energy, Timing resolution • Implement WLS bar/ fiber

More Related