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External Review of LHC Collimation Project Oliver Aberle 1 th July 2004

External Review of LHC Collimation Project Oliver Aberle 1 th July 2004. Mechanical robustness. Overview. Material choice Ansys results Material for phase 1 SPS test: Robustness Beam parameters Thermo-mechanical Analysis Results What can we learn?. Material choice.

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External Review of LHC Collimation Project Oliver Aberle 1 th July 2004

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  1. External Review ofLHC Collimation ProjectOliver Aberle1th July 2004 Mechanical robustness

  2. Overview • Material choice • Ansys results • Material for phase 1 • SPS test: Robustness • Beam parameters • Thermo-mechanical Analysis • Results • What can we learn? External Review of LHC Collimation Projects

  3. Material choice • Which material withstands the different LHC beam scenarios? External Review of LHC Collimation Projects

  4. Material choice - Has to withstand 3 major scenarios: • Proton beam at 7 TeV (9.1e11 p, 200ns) • Beam at Injection (450 GeV, 3.2e13 p) • Ion beam (e.g. Pb) - Other demands • Vacuum • Impedance External Review of LHC Collimation Projects

  5. Material choice A: 10x10 mm B: 5x5 mm Finite Element Model 2D MESH 104 parabolic elements 3 104 nodes 0.05x0.05 mm mesh size MATERIALS Graphite Beryllium 3D CFC Graphite matrix with:27 % in x direction4 % in y and z direction Elastic linear law Small deformations Free Sliding Beam sweeping Symmetry External Review of LHC Collimation Projects

  6. Ansys results Graphite Slice at 20 cm / 7 TeV CFC Slice at 100 cm / 450 GeV External Review of LHC Collimation Projects

  7. Ansys results Stress values for different proton load cases Maximum stress values External Review of LHC Collimation Projects

  8. Material for phase 1 • Graphite or Carbon-carbon(very similar robustness?!) • 10 times more robust than next best material (Be) • Beryllium does not withstand the expected beam impact at injection and 7 TeV (Ok for slow losses) External Review of LHC Collimation Projects

  9. SPS test: Robustness Vacuum tank Beamaxis Support Plug-in system External Review of LHC Collimation Projects

  10. SPS test: Robustness • Full size horizontal collimator • Jaw length 1.2m • Jaw material CFC • Movement withLEP motors (2 per jaw) • Clamped jaws, water cooled External Review of LHC Collimation Projects

  11. Beam parameters • Extraction of 4 × 72 bunches,1.1 × 1011 protons each (2.4 MJ) • Robustness test with 5 shots450 GeV, beam size 1 mm External Review of LHC Collimation Projects

  12. Thermo-mechanical Analysis FEM Model for 3-D analysis Contact elem. (Friction + Therm. Cond.) Temperature dependent properties Deposited Power (W/m3) Pinned + Free exp. BC Cooling pipes Jaw material Courtesy A. Bertarelli & R. Perret External Review of LHC Collimation Projects

  13. Thermo-mechanical Analysis Dynamic stress – Preliminary estimation Quasi-static Stress Dynamic stress External Review of LHC Collimation Projects

  14. Ansys results Graphite R4550 Slice at 100 cm / 7 TeV Graphite R4550 Sy = 20,7 MPa A. Dallocchio & A. Bertarelli External Review of LHC Collimation Projects

  15. Ansys results CFC Slice at 100 cm / 450 GeV CFC AC150 Sy = 58,1 MPa External Review of LHC Collimation Projects

  16. Ansys results CFC Slice at 100 cm / 450 GeV Graphite R4550 Small deformations: ux = 6 mm External Review of LHC Collimation Projects

  17. Ansys results CFC Slice at 100 cm / 450 GeV Graphite R4550 Isotropic A. Dallocchio & A. Bertarelli External Review of LHC Collimation Projects

  18. What can we learn? • Robustness • Material properties (Fluka, Ansys) • Shower, energy • Vacuum behaviour • Collimator • Cooling • Shower, energy deposition (Fluka) • Impedance • Beam Settings External Review of LHC Collimation Projects

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