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High-Z target test at HiRadMat Proposal 1409

High-Z target test at HiRadMat Proposal 1409. C. Torregrosa, A. Perillo-Marcone, F . Loprete , M. Di Castro, D. Horvath, M. Calviani (EN/STI) With feedbacks from A. Lechner, S. Montesano (EN/STI). HiRadMat Scientific Board Meeting 14 th March 2014. Outline.

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High-Z target test at HiRadMat Proposal 1409

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  1. High-Z target test at HiRadMatProposal 1409 C. Torregrosa, A. Perillo-Marcone, F. Loprete, M. Di Castro, D. Horvath, M. Calviani (EN/STI) With feedbacks from A. Lechner, S. Montesano (EN/STI) HiRadMat Scientific Board Meeting 14th March 2014

  2. Outline M. Calviani - High-Z target test at HiRadMat - proposal 1409 • AD-target design and target R&D • Proposed HiRadMat tests • Beam requirements and experimental setup

  3. Introduction M. Calviani - High-Z target test at HiRadMat - proposal 1409 • Target material R&D: realization of a new target for the antiproton physics in the AD machine and for future CERN projects • Challenging regime in terms of strain rates and stresses • High-Z material mandatory for AD physics: iridium, tungsten and tungsten heavy alloys under consideration

  4. AD-target zone M. Calviani - High-Z target test at HiRadMat - proposal 1409 • Production of antiprotons for the AD physics • 26 GeV/c protons, 1.45*1013 p/pulse • 60 kJ/spill • 4 bunches separated by 105 ns  1.45*1013 p/spill • Beam size: 0.5(H)x1(V) mm21s

  5. Target design M. Calviani - High-Z target test at HiRadMat - proposal 1409 • Modular and compact device, composed by coaxial elements: • Iridium production material • Inner core is a 5.5 cm Ir, 3 mm Øcylinder embedded into a graphite matrix • Graphite cladding • Water-cooled Ti alloy body

  6. Energy density Max energy density due to beam in the target ~7.5 kJ/cm3/pulse M. Calviani - High-Z target test at HiRadMat - proposal 1409

  7. Temperature transient in Ir rod (AD) • 2200 C° peak temperature single pulse • Temperature gradients of 2000 C° in <1.5 mm • Ir parameters at very high temperature not know in literature M. Calviani - High-Z target test at HiRadMat - proposal 1409

  8. Strain rates M. Calviani - High-Z target test at HiRadMat - proposal 1409 • Strain rates up to 4*104 s-1 • Radial oscillation ~5-25 mm, max radial velocity 65 m/s • Frequency ~1 MHz

  9. Radial stresses M. Calviani - High-Z target test at HiRadMat - proposal 1409 • Rod centre: • Compressive ~10 GPa • Tensile ~6.5 GPa • External surface: • Compressive ~450 MPa • Tensile ~300 MPa

  10. M. Calviani - High-Z target test at HiRadMat - proposal 1409 • No real experience of material behaviour under these extreme conditions exists • Implicit FEM results are a coarse approximation of reality due to high dynamic stresses, high strain rates and high temperatures • Hydro-codes (collaboration with EN/MME): • hydro-dynamic response of material at high pressure and temperature • HiRadMat tests with the objective to: • Cross-check with numerical results (EOS models, strength material models, etc.) • Experimental insights of material behaviour at such conditions

  11. HiRadMat setup M. Calviani - High-Z target test at HiRadMat - proposal 1409 • Material to be tested: • 6 mm Ø rods, ~100 mm long • Iridium, W, WL, WRe (2 for each) + 2 nickel coated + CuCrZr/Ni (~10 total) • Installed on rotated wheel, allowing an alignment accuracy of ≤100 mm • Upstream hBN jaws (~400 mm long, 1l) for beam alignment, 4 planes with 2 axis • Tank in inert atmosphere (He), to avoid oxidation (either leak tight or in slight under pressure with HEPA filters)

  12. Preliminary tank ideas M. Calviani - High-Z target test at HiRadMat - proposal 1409

  13. M. Calviani - High-Z target test at HiRadMat - proposal 1409 • Tank design of proposal 1409 (this) and 1410 could be very similar, with similar alignment requirements and instrumentation

  14. Beam requirements M. Calviani - High-Z target test at HiRadMat - proposal 1409 • Pulse intensity ~1-5*1012 p/pulse • Spot size: 1x1 mm2 1.5x1.5 mm2 • Total number of medium-high intensity pulses: ~300-400 • Ramp-up approach • Other ~200 low intensity pulses could be anticipated • Integral intensity ~2*1015 POT • Beam alignment/stability: • Maximum shift pulse-by-pulse ~100/200 mm • Important to have it guaranteed, not only monitor • Monitor beam asymmetry ~100 mm

  15. Observables and instrumentation M. Calviani - High-Z target test at HiRadMat - proposal 1409 • Radial displacement of the rods, for different longitudinal positions • Attocube FPS3010 interferometer • Temperature increase on the target rod • Fiber-optic based pyrometers • Images of crack propagation and possible particle projections • Fast camera (flash need to be procured) • Strains gaugesat various longitudinal positions • Internal cracks • Ultrasonic sensors (EMAT)

  16. Additional tools M. Calviani - High-Z target test at HiRadMat - proposal 1409 • BLMs • Potentially standard ones installed close to the tank, hBN scan • Beam losses during alignment • “button” BPMs • To be installed on the target seeing the beam to have real-time beam position on target • Resolution ~50-100 mm

  17. Radiation levels (TID, HEH) O(~1013) HEH/cm2/experiment @20 cm O(~50) kGy/experiment @20 cm M. Calviani - High-Z target test at HiRadMat - proposal 1409 • Rad-hard electronics close to the experimental setup • Non rad-hard in the bunker upstream the tables

  18. Effect of a 7.2 us pulse • Long pulse reduces the radial stresses, staying in compressive state rather than oscillating between compressive to tensile • Beam parameters to be adapted M. Calviani - High-Z target test at HiRadMat - proposal 1409 • HiRadMat pulse is ~15x longer than the AD-target one  dynamic response is different

  19. Radioprotection aspects PRELIMINARY M. Calviani - High-Z target test at HiRadMat - proposal 1409 • Pessimistic evaluation based on all protons reaching a single target • ~100 mSv/h at 10 cm after 6 months

  20. Conclusions M. Calviani - High-Z target test at HiRadMat - proposal 1409 • We propose the realization of a HiRadMat test of high-Z target materials • Measurement of radial displacement and cross-check of numerical simulations • Important to assess which beam parameters can be “guaranteed” • Experiment could be foreseen for spring 2015

  21. BACKUP M. Calviani - High-Z target test at HiRadMat - proposal 1409

  22. W rod M. Calviani - High-Z target test at HiRadMat - proposal 1409 • HiRadMat conditions – intensity required to reach 2050 °C ~1.4*1012 p/pulse

  23. Energy density variation M. Calviani - High-Z target test at HiRadMat - proposal 1409

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