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

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Presentation transcript:

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

External Review of LHC Collimation Projects Overview Material choice Ansys results Material for phase 1 SPS test: Robustness Beam parameters Thermo-mechanical Analysis Results What can we learn? 01.07.04 External Review of LHC Collimation Projects

External Review of LHC Collimation Projects Material choice Which material withstands the different LHC beam scenarios? 01.07.04 External Review of LHC Collimation Projects

External Review of LHC Collimation Projects 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 As before for “+” and “-”. +: No bonding technique (e.g. brazing) needed, cheap, independent of jaw material, easily replaceable (no need to throw away everything), compact, no penetrations. “-”: longer if “V” shaped is not used (but a “V-shape” would likely entail no “in-situ” spares). 01.07.04 External Review of LHC Collimation Projects

External Review of LHC Collimation Projects 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 direction 4 % in y and z direction Elastic linear law Small deformations Free Sliding Beam sweeping Symmetry 01.07.04 External Review of LHC Collimation Projects

External Review of LHC Collimation Projects Ansys results Graphite Slice at 20 cm / 7 TeV CFC Slice at 100 cm / 450 GeV 01.07.04 External Review of LHC Collimation Projects

External Review of LHC Collimation Projects Ansys results Stress values for different proton load cases Maximum stress values 01.07.04 External Review of LHC Collimation Projects

External Review of LHC Collimation Projects 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) 01.07.04 External Review of LHC Collimation Projects

External Review of LHC Collimation Projects SPS test: Robustness Vacuum tank Beam axis Support Plug-in system 01.07.04 External Review of LHC Collimation Projects

External Review of LHC Collimation Projects SPS test: Robustness Full size horizontal collimator Jaw length 1.2m Jaw material CFC Movement with LEP motors (2 per jaw) Clamped jaws, water cooled 01.07.04 External Review of LHC Collimation Projects

External Review of LHC Collimation Projects Beam parameters Extraction of 4 × 72 bunches, 1.1 × 1011 protons each (2.4 MJ) Robustness test with 5 shots 450 GeV, beam size 1 mm 01.07.04 External Review of LHC Collimation Projects

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 01.07.04 External Review of LHC Collimation Projects

Thermo-mechanical Analysis Dynamic stress – Preliminary estimation Quasi-static Stress Dynamic stress 01.07.04 External Review of LHC Collimation Projects

External Review of LHC Collimation Projects Ansys results Graphite R4550 Slice at 100 cm / 7 TeV Graphite R4550 Sy = 20,7 MPa A. Dallocchio & A. Bertarelli 01.07.04 External Review of LHC Collimation Projects

External Review of LHC Collimation Projects Ansys results CFC Slice at 100 cm / 450 GeV CFC AC150 Sy = 58,1 MPa 01.07.04 External Review of LHC Collimation Projects

External Review of LHC Collimation Projects Ansys results CFC Slice at 100 cm / 450 GeV Graphite R4550 Small deformations: ux = 6 mm 01.07.04 External Review of LHC Collimation Projects

External Review of LHC Collimation Projects Ansys results CFC Slice at 100 cm / 450 GeV Graphite R4550 Isotropic A. Dallocchio & A. Bertarelli 01.07.04 External Review of LHC Collimation Projects

External Review of LHC Collimation Projects What can we learn? Robustness Material properties (Fluka, Ansys) Shower, energy Vacuum behaviour Collimator Cooling Shower, energy deposition (Fluka) Impedance Beam Settings 01.07.04 External Review of LHC Collimation Projects