n_TOF Target #3 Baseline Design A. Perillo-Marcone EN-STI-TCD

A. Perillo-Marcone - n_TOF Target #3 Baseline Design Introduction Requirement: A new target to be installed by end of 2020. Design criteria Al on external parts to be avoided for RP waste disposal Avoid direct contact between water and lead Add dedicated moderator for EAR2 Unperturbed isolethargic neutron spectrum Minimize in-beam g-background To be able to efficiently manage the beam power on target To last at least up to LS4 29/05/2019 A. Perillo-Marcone - n_TOF Target #3 Baseline Design

Expected Lifetime of Target #3 Installation of Target #3 LS2 LS3 LS4 LS5 Earliest dismantling (8 years of operation) 29/05/2019 A. Perillo-Marcone - n_TOF Target #3 Baseline Design

A. Perillo-Marcone - n_TOF Target #3 Baseline Design Options Studied Solution 2 Solution 4 Solution 5 (Baseline) Ti64-contained Pb (water cooled) Ti64-contained Pb (water cooled) External Pb mass (N2 cooled) Pb plates/blocks (N2 cooled) details in M.Calviani’s presentation 29/05/2019 A. Perillo-Marcone - n_TOF Target #3 Baseline Design

Main Features of Proposed Design N2 cooled Pb target (no water contamination issues) Similar physics performance (V.Vlachoudis’ presentation) Priority given to intensity (up to 1·1013), power will be limited to the same as today (1.66·1012 p/s) Robust mechanical design Only one cooling circuit (N2), as opposed to Sol. 4 Prototype tested in HRMT (R.Esposito’s presentation) 29/05/2019 A. Perillo-Marcone - n_TOF Target #3 Baseline Design

A. Perillo-Marcone - n_TOF Target #3 Baseline Design Proposed Design details in M.Timmins’ and V.Maire’s presentations Anti-creep plates Bi-metallic transition 29/05/2019 A. Perillo-Marcone - n_TOF Target #3 Baseline Design

A. Perillo-Marcone - n_TOF Target #3 Baseline Design Core Target Design Sliced Pb core Significant development (R.Esposito and R.Franqueira) details in M.Timmins’ and V.Maire’s presentations 29/05/2019 A. Perillo-Marcone - n_TOF Target #3 Baseline Design

Mechanical performance Able to withstand expected thermo-mechanical loads details in R.Esposito’s presentation Temperature distribution in Pb Stress (von Mises) distribution in Pb 29/05/2019 A. Perillo-Marcone - n_TOF Target #3 Baseline Design

A. Perillo-Marcone - n_TOF Target #3 Baseline Design Thermal performance Different plates → better cooling performance R.Esposito’s and R.Franqueira’s presentations 29/05/2019 A. Perillo-Marcone - n_TOF Target #3 Baseline Design

A. Perillo-Marcone - n_TOF Target #3 Baseline Design Moderators Upgraded moderator for EAR1 Dedicated moderator for EAR2 Details in M.Timmins’ and V.Maire’s presentations 29/05/2019 A. Perillo-Marcone - n_TOF Target #3 Baseline Design

A. Perillo-Marcone - n_TOF Target #3 Baseline Design Optimised SS Vessel details in M.Timmins’ and V.Maire’s presentations 29/05/2019 A. Perillo-Marcone - n_TOF Target #3 Baseline Design

Prototypes (proven feasibility) Bimetallic transition Anti-creep structure HiRadMat Test (Pb in N2 atmosphere) Details in M.Timmins’ and R.Esposito’s presentations 29/05/2019 A. Perillo-Marcone - n_TOF Target #3 Baseline Design

Details in F.Dragoni’s presentation Upgraded Cooling Dedicated N2 station Separate/versatile moderator circuits Details in F.Dragoni’s presentation 29/05/2019 A. Perillo-Marcone - n_TOF Target #3 Baseline Design

A. Perillo-Marcone - n_TOF Target #3 Baseline Design Instrumentation Thermocouples in the target core Full monitoring of N2 and water circuits (F.Dragoni’s presentation) SEM grid (beam monitoring) (O.Aberle’s presentation) Objectives Know actual performance Benchmark numerical models Predict performance under different conditions Determine realistic limits of the target NO INTERLOCKING 29/05/2019 A. Perillo-Marcone - n_TOF Target #3 Baseline Design

Waste Management and RP Minimisation of Al on the outside Remote-handling compatible, dismantleable assembly (M.Timmins’ presentation) All RP aspects studied in detail and considered carefully (F.Pozzi’s presentation) 29/05/2019 A. Perillo-Marcone - n_TOF Target #3 Baseline Design

O.Aberle’s presentation N_TOF Facility O.Aberle’s presentation Target replacement part of n_TOF facility upgrade (EDMS 2134348) 29/05/2019 A. Perillo-Marcone - n_TOF Target #3 Baseline Design

A. Perillo-Marcone - n_TOF Target #3 Baseline Design Conclusions The proposed design addresses past issues and new requirements Comparable performance for EAR1 Improved performance for EAR2 Reduction/removal of water contamination issues Improved monitoring of target operation Future dismantling and waste disposal taken into account 29/05/2019 A. Perillo-Marcone - n_TOF Target #3 Baseline Design

Thank you for your attention.