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AdColMat : Status of the Working Group and Recent Advancements

AdColMat : Status of the Working Group and Recent Advancements. Working Group on Advanced Materials for Collimators 4 th Meeting - 21/7/2014 A. Dallocchio EN-MME-FS. Outline. Materials R&D Analyses of HiRadMat 1 st run experiments (HRMT09&HRMT14 )

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AdColMat : Status of the Working Group and Recent Advancements

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  1. AdColMat:Status of the Working Group and Recent Advancements Working Group on Advanced Materials for Collimators 4th Meeting- 21/7/2014 A. Dallocchio EN-MME-FS

  2. Outline A. Dallocchio • Materials R&D • Analyses of HiRadMat 1st run experiments (HRMT09&HRMT14) • Tests proposed for HiRadMat 2nd run (HRMT21 & HRMT23) • Latest updates on collimator simulations • Conclusions

  3. Materials R&D (more details in E. Quaranta presentation) • Extensive thermo-physical and mechanical characterization (CERN, GSI, PoliTo) ongoing on the following materials: • AC150K CFC • R4550 Graphite • MoGr • CuCD • Molybdenum (2 grades: PLANSEE and AT&M) • Tungsten-Rhenium • Irradiation campaigns in the frame of several collaborations: • Kurchatov Institute (Russia): 30MeV protons and 26 C-ions irradiation on CFC, CuCD, MoCuCD • BNL (USA): 200 MeV proton irradiation on Molybdenum, Glidcop, CuCD, MoGr • GSI (Germany): 1 GeV U and Bi-ions irradiation on CFC, CuCD, MoGr. Au-ions irradiation on CFC, CuCD and MoGr (currently on-going, 13-23 July 2014) A. Dallocchio

  4. Materials R&D (more details in E. Quaranta presentation) • New instruments procured and new measurement methods developed: • Laser-flash to measure diffusivity and conductivity of the materials • Dilatometer to measure the CTE • Differential Scanning Calorimeter to precisely measure the specific heat of materials up to 2000 ˚C, also detecting phase transitions (to be delivered) • Ad-hoc setup prepared at EN/MME mechanical lab to determine the elastic matrix constant of anisotropic materials (E, G, n in the different directions) Dilatometer Laser-Flash A. Dallocchio

  5. HRMT09 • The experiment allowed to benchmark thermo-mechanical simulations and to highlight potential machine protection issues, on top of mechanical damage, due to projection of fragments and dust • Test bench currently stored at b. 954 waiting for post-irradiation analysis A. Dallocchio

  6. HRMT14 Glidcop Al-15: 4.66e12 protons, simulated vs. measured radial velocity MoGr: 1.95e13 protons Maximum Temperature Status of the simulations • Inermet180 ✓ • Glidcop Al-15 ✓ • Molybdenum ✘ • Molybdenum-Diamond ✘ • Copper-Diamond ✓ • Molybdenum-Graphite ✓ • Measurements on Inermet and Glidcop successfully benchmarked against explicit numerical simulations. Results published in Nucl.Instrum.Meth. B308 (2013) 88-99 • Copper-Diamond and Molybdenum-Graphite recentlysimulated by M. Garlasché: results to be presented during a future AdColMat meeting • The Equation of State of Molybdenum is needed to complete simulations on the last two materials  action A. Dallocchio A. Dallocchio

  7. HRMT21 Experiment overview • HRMT21 – Objective: verify the robustness of the SLAC rotatable collimator against proton impact (beam injection error scenario). • Experiment approved by the HiRadMat Scientific Committee (14/3/2014) A. Dallocchio

  8. HRMT23 Experiment overview • HRMT23 – Objectives: • Integrally test under LIU/SPS beam train jaws for HL-LHC collimators (baseline: 288 bunches, 1.7E11 p/b; can we go up to 2.3E11 p/b?) • Acquire online data about response of complete jaws to beam impact • Assess impact consequences on jaws components after irradiation • Experiment approved by the HiRadMat Scientific Committee (14/3/2014) • If collimator robustness assessed by the experiment  1 TCSx prototype to be installed in the LHC during Christmas Break 2015 A. Dallocchio

  9. HRMT23 Experiment overview • HRMT23 – Main features: • Three superposed jaws in one tank. • Jaws equipped with set of strain gauges, temperature sensors, … for online acquisition. • Special tank equipped with viewports for optical acquisition, LDV, electric connections etc. and fast dismounting system for glove box post-irradiation observations. A. Dallocchio

  10. CollimatorSimulations Work ongoing (more details in M. Garlasché presentation): • TCSG: • Finite elements analysis of the beam injection error scenario (P. Gradassi) • Same parameters defined in 2004, with HL-LHC intensity (6.4E13 p) • FLUKA inputs courtesy of A. Lechner, A. Patapenka and L. Skordis • TCSP: • Beam injection error scenariohas been confirmed as the most critical (no problems highlighted in case of asynchronous beam dump) • In case of HL-LHC intensity, T > Tmelt on the downstream tapering! • Recently installed TCSP cannot experience this accident scenario • Aluminium tapering under study for future TCSP (coating needed to cope with secondary electron yield) • FLUKA inputs courtesy of A. Lechner, A. Patapenka and L. Skordis A. Dallocchio

  11. CollimatorSimulations Work ongoing (more details in M. Garlasché presentation): • TCT: • New thresholds for tertiary collimators (asynchronous beam dump scenario) calculated and presented during MPP Annecy 2013: • Onset of plastic damage : 5x109 p • Limit for fragment ejection: 2x1010 p • Limit of for 5th axis compensation (with fragment ejection): 1x1011p • Updated asynchronous beam dump scenario studied by R. Bruce and L. Lari (presented during AdColMat 3th meeting), featuring fractions of subsequent bunches impacted the collimator in different spots • SixTrack/FLUKA inputs not available yet • TCSx: • FLUKA analysis ongoing (T. Manousos, L. Skordis) to evaluate beam injection error scenario on MoGr active jaw • New iterations will most likely be needed, in particular for the active jaw (CuCD to be simulated) A. Dallocchio

  12. Conclusions • R&D on materials is rapidly progressing, with tests at CERN, GSI, BNL and PoliTo (Elena’s presentation) • New instruments are being procured and new measurement methods have been developed: • Laser-flash and dilatometer have already been delivered • Differential Scanning Calorimeter will allow to precisely measure the specific heat of materials up to 2000 ˚C, also detecting phase transitions • Ad-hoc setup prepared at EN/MME mechanical lab to determine the elastic matrix constant of anisotropic materials (E, G, n in the different directions) • Benchmarking of HRMT14 measurements almost completed; the last simulations will be performed once Mo EOS is available • Two experiments proposed for HiRadMat 2nd run (2015): HRMT21 (SLAC rotatable collimator) and HRMT23 (collimator jaws). Both experiments recommended by the HiRadMat Scientific Committee • Several additional simulations (FLUKA and Thermo-mechanical) completed on different collimators with HL-LHC parameters. A. Dallocchio

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