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

2. 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
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A. Perillo-Marcone - n_TOF Target #3 Baseline Design

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

4. 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
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A. Perillo-Marcone - n_TOF Target #3 Baseline Design

5. 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)
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A. Perillo-Marcone - n_TOF Target #3 Baseline Design

6. 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
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A. Perillo-Marcone - n_TOF Target #3 Baseline Design

7. 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
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A. Perillo-Marcone - n_TOF Target #3 Baseline Design

8. 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
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A. Perillo-Marcone - n_TOF Target #3 Baseline Design

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

10. 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
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A. Perillo-Marcone - n_TOF Target #3 Baseline Design

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

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

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

14. 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
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A. Perillo-Marcone - n_TOF Target #3 Baseline Design

15. 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)
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A. Perillo-Marcone - n_TOF Target #3 Baseline Design

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

17. 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
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A. Perillo-Marcone - n_TOF Target #3 Baseline Design

18. Thank you for your attention.