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 CERNTargets, collimator, dumps, stoppers, etc.Design, operation, maintenance, control, etc.
Wide range of energy deposition, peak, total, stresses, temperature
Materials ranging from graphite to tungstenDue to very high peak intensity (no CW-
beams), very significant dynamical stressesFew selected examples to follow…
AD-target Iridium target, subject to impact of 26 GeV/c
proton beam, 1.5*1013 p/pulse (400 ns)
Sudden increase of temperature >2000 °C in <0.5 ms
Few 1018 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(1015 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*1021 n/cm2 (>0.1 MeV)Thermal cycling 25-150 C and 420 C, 5*106
cyclesTest 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
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