1. EURISOL-DS 6th Coordination Board, IPN-Orsay, FranceJune 12, 2007 1 EURISOL DS PROJECT Task#2: MULTI-MW TARGET DESIGN Y. Kadi On behalf of Task#2 European Organization for Nuclear Research, CERN CH-1211 Geneva 23, SWITZERLAND yacine.kadi@cern.ch

2. EURISOL-DS 6th Coordination Board, IPN-Orsay, FranceJune 12, 2007 2 Done In progress Planned In progress Task#2 – Multi-MW Liquid Hg Target Reporting: 3 conf. proceedings 12 tech. notes

3. EURISOL-DS 6th Coordination Board, IPN-Orsay, FranceJune 12, 2007 3 Radial Direction [mm] CFD Model 25[mm] Beam CFD Model 15[mm] Beam Different Beam with Various intensity

4. EURISOL-DS 6th Coordination Board, IPN-Orsay, FranceJune 12, 2007 4 Comparison of Von-Mises stress Corresponding to temp distribution Von-Mises stress(25mm)Von-Mises stress(15mm)

5. EURISOL-DS 6th Coordination Board, IPN-Orsay, FranceJune 12, 2007 5 Thickness optimisation for a 25mm beam 3.5mm 0.8mm 1.3mm

6. EURISOL-DS 6th Coordination Board, IPN-Orsay, FranceJune 12, 2007 6 Pulse Beam pulse duration of 1ms and 50 Hz repetition rate (pulse distance = 20ms) and a density power of 4 MW on the target are presented. Monitor Probes Convergence of monitor probes to equilibrium point

7. EURISOL-DS 6th Coordination Board, IPN-Orsay, FranceJune 12, 2007 7 Pulse Beam

8. EURISOL-DS 6th Coordination Board, IPN-Orsay, FranceJune 12, 2007 8 Von-Mises stress of pulse beam at 1.99952s

9. EURISOL-DS 6th Coordination Board, IPN-Orsay, FranceJune 12, 2007 9 Task#2 – 3D CFD & Structural Analysis

10. EURISOL-DS 6th Coordination Board, IPN-Orsay, FranceJune 12, 2007 10 Conclusion The final optimisation has yielded a satisfactory solution to the all necessary objectives. Definite advantages from inserting blades and spacers within target hull from the point of view of lower stresses and temperature. A mesh refinement control helped choosing an adequate mesh for the computation. The result of pulse beam was quite satisfactory, however it is recommended that, study on shock waves and stress propagation as effect of the pulses. Finally, the major goal, which consists in the prediction of erosive effects of gravity in liquid metal flow, has to be followed. This goal can be achieved by simulating 3D model. Task#2 – 3D CFD & Structural Analysis

11. EURISOL-DS 6th Coordination Board, IPN-Orsay, FranceJune 12, 2007 11 Done In progress Planned In progress Task#2 – Multi-MW Liquid Hg Target Reporting: 3 conf. proceedings 12 tech. notes

12. EURISOL-DS 6th Coordination Board, IPN-Orsay, FranceJune 12, 2007 12 Task#2 – Liquid Hg Loop

13. EURISOL-DS 6th Coordination Board, IPN-Orsay, FranceJune 12, 2007 13 Liquid Hg Loop – Transverse Film

14. Target window – Liquid metal container Vanes to turn flow 180 o LM Inlet LM Outlet Optional Vanes to turn flow 30 o protons LM Heat shield isolating cold inlet LM from hot exit LM Inner guide tube

15. EURISOL-DS 6th Coordination Board, IPN-Orsay, FranceJune 12, 2007 15 Final assembly: guide tube attached to inlet interface Bend back instrumentation cables lying in the channels and lead out of tube Insert guide tube, fully instrumented with cabling in channels into inlet interface Weld guide tube to back Weld guide tube to its outer shell Weld on outer hull

16. EURISOL-DS 6th Coordination Board, IPN-Orsay, FranceJune 12, 2007 16 Design status The design of the target is now finalised. Last remaining open manufacturing difficulties have been cleared Manufacturing drawings are being prepared for mid-June. Design review projected end of June. Internal PSI workshop and manufacturers will then be consulted and request for quotes sent out in July.

17. EURISOL-DS 6th Coordination Board, IPN-Orsay, FranceJune 12, 2007 17 TASK #2 – Multi-MW Target

18. EURISOL-DS 6th Coordination Board, IPN-Orsay, FranceJune 12, 2007 18 Summary and Outlook The reference design of the 4 MW Hg spallation target and its ancillary equipment has advanced very significantly over the last year, but still the design reference parameters need to be tuned, particularly in the case of the secondary fission target surrounding the neutron converter. The needs to freeze the design reference parameters (in particular the overall dimensions of the liquid Hg loop, hot cell, vacuum system, etc…) becomes urgent in particular for Task #5 to progress on the work related to the shielding and safety calculations. It is strongly recommended to undertake a detailed study of the Hg “transverse film” which would allow a much more compact geometry of the fission target. The design of the fission target has been improved with the requirement to efficiently extract and ionize the fission fragments and to minimize the amount of fissionable material in the target assembly for a given beam intensity. Some ideas for ion sources operating with high gas load are under investigation. Vacuum and Remote Handling System are being conceptually investigated => MAFF concept

19. EURISOL-DS 6th Coordination Board, IPN-Orsay, FranceJune 12, 2007 19 Material Irradiation Proton Beam Fission Target Tube Hg Proton to Neutron converter Neutron source Task#2 – Integration of MAFF concept

20. EURISOL-DS 6th Coordination Board, IPN-Orsay, FranceJune 12, 2007 20 Production of fission fragment beams > evacuated, through-going beam tube SR-6: Zirkaloy beam tube: - no embrittlement by neutrons - high melting temp.: 1850 o C > MAFF principle:

21. EURISOL-DS 6th Coordination Board, IPN-Orsay, FranceJune 12, 2007 21 Source exchange unit Source trolley Source (1g U in C)

22. EURISOL-DS 6th Coordination Board, IPN-Orsay, FranceJune 12, 2007 22 Fission Target Tube Hg Proton to Neutron converter Hg inlet Hg outlet Task#2 – 3D Cut View

23. EURISOL-DS 6th Coordination Board, IPN-Orsay, FranceJune 12, 2007 23 Fission target Beam outlet Cryo Panel Beam optics Beam Tube Double wall tube Task#2 – 3D view of the fission target

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25. EURISOL-DS 6th Coordination Board, IPN-Orsay, FranceJune 12, 2007 25 Beam tube Safety Net/Mesh Container support Re ou Ta BeO insulator Double wall tube Target material (Graphite / Uranium) Target container (Re) To retain the target in case of failure To cool down theconcrete as well as evacuate the heat generation on the target Task#2 – 3D view of the fission target Target: (100 cm3) 250g Graphite with up to 10g 235 U Operational temperature: up to 2400°C Materials: Re, Ta, W, BeO Local moderator

26. EURISOL-DS 6th Coordination Board, IPN-Orsay, FranceJune 12, 2007 26 Target: 25g Graphit with up to 1,2g 235 U Operational temperature: up to 2400°C Materials: Re, Mo, W, BeO Calculated emittance at 30keV:  =12  mm mrad First prototype Materials: Fe, Ta, W, BeO measured emittance at 30keV:  =25  mm mrad Fissions/s of 1.2g U: 1,49 10 14 /s Uranium consumpt. in 52 days: 17%

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