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Published byBritney Scott Modified over 8 years ago
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Possible irradiation needs from CERN and requirements (a partial and selected view) M. Calviani (EN/STI)
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Introduction EN/STI group in charge of all beam intercepting devices at CERN Targets, collimator, dumps, stoppers, etc. Design, operation, maintenance, control, etc. Wide range of energy deposition, peak, total, stresses, temperature Materials ranging from graphite to tungsten Due to very high peak intensity (no CW- beams), very significant dynamical stresses Few selected examples to follow…
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AD-target Iridium target, subject to impact of 26 GeV/c proton beam, 1.5*10 13 p/pulse (400 ns) Sudden increase of temperature >2000 °C in <0.5 s Few 10 18 POT/y ~0.3-4 DPA/y reached Unknown mechanical properties in the hydrodynamic regime
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HiRadMat Study the dynamical responses of material under high intensity proton impact (collimator, targets, etc.) O(10 15 POT/experiment)
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Dumps Several new proton dumps (SPS, LHC, FCC) are under study or in the way to be studies Possible needs of R&D on special 3D carbon- carbon or other novel ideas Mechanical properties under irradiation are not precisely known O(1 DPA) irradiation
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Spallation targets (n_TOF) 20 kW Pb-based neutron white source Present target lifetime foreseen ~10 years New materials for the future spallation targets to improve physics reach and operational aspects Mechanical properties of irradiated high-Z materials, O(0.5 DPA)
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SHiP production target Proposal for a new 400 kW production target for hidden particles searches Hybrid TZM/W/W-(1.5%)TiC target, water cooled Significant thermal cycling (5*106), significant pulse-by-pulse temperature excursion (250 °C)
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SHiP material R&D example Dose levels ~5*10 21 n/cm 2 (>0.1 MeV) Thermal cycling 25-150 C and 420 C, 5*10 6 cycles Test campaign (examples): Tensile and compression curves Fatigue (Wohler-type curves in compression) Fracture mechanics tests Impact toughness to assess DBTT (Charpy tests) Coating adherence following irradiation
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Conclusions Just a very rapid and very selected excursion of activities of interest for the STI group Broad range of activities associated to materials R&D, both for dynamic response as well as long-term irradiation We are definitely interesting in understanding the irradiation and PIE possibilities of LENA
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