Presentations by S. Vasiukov (Fluka), M. Benettoni (Mechanical Design, Thermal Simulations), R. Jacobs (Geometry Sketch)
Discussion Points:
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FLUKA Simulation Results:
- Simulation conducted with a 1 nC beam 100x100 micron.
- dose rate becomes acceptable after one week.
- Long-lived gamma emitters, primarily in the copper backing, are a concern.
- Steel shielding of the dump sarcophagus is proposed to mitigate long-lived gamma emitters.
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Material Considerations:
- Aluminum core and copper backing are radiation-resistant with a 100x100 micron beam width with 1nC beam
- Different materials (Lead Sandwich, Tungsten, Copper + Steel shielding) could be explored for the dump structure.
- Lead has mixed-hazard because of material toxicity and radiation, oxidizes (dust!) and melts more easily --> usable in sandwich structure?
- Tungsten? produces beta+ emitters
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Thermal Simulations:
- ANSYS simulations show a peak temperature of 218°C with cooling on the outside.
- The charge considered is 1 nC per train (->scale it to 50 bunches per train, depends thermal dissipation time constant).
- Voxel size for simulations is currently 1 cm cubed, but it should be reduced to 1 mm cubed for better accuracy, should be feasible regarding compute-time and file size
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Dump Geometry:
- Preliminary geometry requirements are outlined based on the TDC magnet and current dump dimensions.
- The angle for 40 GeV electrons is approximately 0.9°, which will be input into Massimo's design.
Action Items:
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Shielding Design:
- Obtain the steel shielding model from Massimo to input to Sergiis Fluka simulation.
- Explore the use of steel shielding to reduce long-lived gamma emitters.
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Material Selection:
- Further investigate the use of Tungsten, Lead Sandwich, for the dump core.
- Alternative: Al+ Copper core + Steel shielding for sarcophagus
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Thermal Simulations:
- Reduce the voxel size to 1 mm cubed, especially in the central region, for more accurate thermal simulations.
- Study for 50 bunches a 1nC
- Continue ANSYS simulations with the updated voxel size and material properties and study thermal dissipation time
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Dump Geometry:
- Input the angle for 40 GeV electrons (~0.9°) into Massimo's design.
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Next Meeting:
- Schedule the next meeting for the 30th of July at 1 PM
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