Possible irradiation needs from CERN and requirements (a partial and selected view) M. Calviani (EN/STI)

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…

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 POT/y ~0.3-4 DPA/y reached Unknown mechanical properties in the hydrodynamic regime

HiRadMat  Study the dynamical responses of material under high intensity proton impact (collimator, targets, etc.) O(10 15 POT/experiment)

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

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)

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)

SHiP material R&D example  Dose levels ~5*10 21 n/cm 2 (>0.1 MeV)  Thermal cycling 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

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