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It is generally accepted that the physics modeling in the FLUKApackage gives the best agreement with data for the low-energy neutrons and photons that are important here. On the other hand, ATLAS has little expertise with FLUKA but has much experience with Geant4, which is regarded as having a more flexible geometry definition. We therefore decided to use FLUGG, which couples Geant4 geometry with FLUKA physics.
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The earlier studies made by the ATLAS Radiation Task Force is available as Document XYZhave been reported in ATL-GEN-2005-001. We will use the same geometry, materials, etc as in this report, and compare the our FLUGG results with the FLUKA results from the Task Force.
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ATLAS will be replacing the Inner Detector tracker for Super LHC. It is expected to be an all-Silicon detector with pixels and strips. We believe additional shielding is needed for the FCAL. It is also expected to replace part of the muon spectrometer detectors. The scope of the muon upgrade has great uncertainty at this time. It can be as little as replacing the endcap detectors at small radii, or it can be replacing all muon detectors, depending on the background level. One of the goals of the cavern background calculation is to provide a more reliable prediction.
Status
As of mid April May 2009, the validation geometry and materials used by the Radiation Trask Force have been implemented in Geant4. We have checked for and removed volume overlaps. We have run FLUGG. First resultsfrom FLUGG are available. The next step is to define the outputs necessary for comparison with the Task Force results.
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