1 / 10

Lead Attenuators and Lenses Project Update Meeting Summary

Summary of the project meeting on 26.09.2012 regarding lead attenuators, uniformity lenses, pricing quotes, technical drawings, and simulation methods. Updates on material specifications, manufacturing timelines, and simulation strategies.

annora
Télécharger la présentation

Lead Attenuators and Lenses Project Update Meeting Summary

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. UPDATE Lead AttenuatorS and LENSES Dorothea Pfeiffer GIF++ Project Meeting 26.09.2012

  2. Lead attenuators • Asked Calder Industrial Materials Ltd for quote for two of the field uniformity lenses Bart simulated: • Spherical lense: 5456.31 Euros • Double cylindrical lense: 4951.16Euros • Will be mounted onto metal sheet (free issue plate) • Lead type used will be to BS3909/2 4%Sb alloy • Lead time will be 8-10 weeks from time of order and receipt of the free issue plates • Tolerances will be as per drawings, the flatness tolerance on the free issue plate will have an effect so will need to be good • Expensive ! Dorothea Pfeiffer

  3. Lead attenuators • Received technical drawings of lead attenuators and movement system from Hans Reithler (RWTH Aachen) THANKS! • Also received CNC programming files • Aachen might be willing to help with the attenuators and mechanical system Dorothea Pfeiffer

  4. Field uniformity lense • Attempt to find the ideal shape • For 82Pb and Ekin= 662 keV, linear attenuation coefficient μ =1.17 cm-1 • I = I0·exp(-μ·d) • I(x) = cos(α)2· Imax • Opening angle α: 37° horizontally, 28° vertically => α in upper corners: 43° • Ratio corner/center = cos(43°)2 = 0.53 • d(x) = - ln(cos(α)2)/mu Dorothea Pfeiffer

  5. Field uniformity lense • Calculation in MATLAB • Fit function to calculated profile • Good fit with function of type: a1·cos(b1·x) + a2·cos(b2·x) Dorothea Pfeiffer

  6. Field uniformity lense • Drawing in AutoCAD • Export as *.stl file • Conversion into Geant4 geometry format GDML with STL2GDML (tesselated volume) • Geant4 simulations very slow due to tesselated volume with 6000 vertices • Not enough statistics yet ! • Use Geant4 polycone approximation instead ? • Simulate in FLUKA with polycone approximation ? Dorothea Pfeiffer

  7. Field uniformity lense Dorothea Pfeiffer

  8. Field uniformity lense Dorothea Pfeiffer

  9. Field uniformity lense Dorothea Pfeiffer

  10. Field uniformity lense Dorothea Pfeiffer

More Related