1. Paul Scherrer Institut 5232 Villigen PSI EURISOL Town Meeting Pisa, March 30-April 2, 2009 / W. Wagner PAUL SCHERRER INSTITUT EURISOL Spallation Neutron Source - status and perspectives - Eurisol Task 2 Pisa Town Meeting April 2009 presented by Werner Wagner Paul Scherrer Institut, Switzerland

2. Paul Scherrer Institut 5232 Villigen PSI EURISOL Town Meeting Pisa, March 30-April 2, 2009 / W. Wagner PAUL SCHERRER INSTITUT EURISOL Coax Mercury Converter Target Outline: Design Test mock-up The METEX experiment Hg-loop outlook

3. Paul Scherrer Institut 5232 Villigen PSI EURISOL Town Meeting Pisa, March 30-April 2, 2009 / W. Wagner PAUL SCHERRER INSTITUT Design parameters and baseline characteristics TM-34-07-05 K.Samec /Design of the EURISOL converter target. – PSI 2007 ~13 l/s 1 GeV proton beam 4 mA beam current Gaussian width 15-25 mm  4 MW thermal power Diameter: < 15cm Length: > 40 cm

4. Paul Scherrer Institut 5232 Villigen PSI EURISOL Town Meeting Pisa, March 30-April 2, 2009 / W. Wagner PAUL SCHERRER INSTITUT Technical layout

5. Paul Scherrer Institut 5232 Villigen PSI EURISOL Town Meeting Pisa, March 30-April 2, 2009 / W. Wagner PAUL SCHERRER INSTITUT CFD design support Structural analysis –Stress analysis of the window area (thermal plus pressure induced stresses) –Resonance analysis of critical areas (vibrations etc.) Fluid dynamics analysis –Hydraulic behaviour: velocity field, pressure distribution, hydraulic resistance –Predictions of cavitation / mitigation measures

6. Paul Scherrer Institut 5232 Villigen PSI EURISOL Town Meeting Pisa, March 30-April 2, 2009 / W. Wagner PAUL SCHERRER INSTITUT Baseline design CFD model Hg out-flow Hg In-flow

7. Paul Scherrer Institut 5232 Villigen PSI EURISOL Town Meeting Pisa, March 30-April 2, 2009 / W. Wagner PAUL SCHERRER INSTITUT 2D CFD results: velocity field Flow-guiding vanes

8. Paul Scherrer Institut 5232 Villigen PSI EURISOL Town Meeting Pisa, March 30-April 2, 2009 / W. Wagner PAUL SCHERRER INSTITUT 3D-CFD LES turbulence model No flow vanes With flow vanes flow detachment attached flow

9. Paul Scherrer Institut 5232 Villigen PSI EURISOL Town Meeting Pisa, March 30-April 2, 2009 / W. Wagner PAUL SCHERRER INSTITUT Temperature distribution Thermal stresses on the window of the outer hull Thermal stress analysis

10. Paul Scherrer Institut 5232 Villigen PSI EURISOL Town Meeting Pisa, March 30-April 2, 2009 / W. Wagner PAUL SCHERRER INSTITUT Test set-up at IPUL

11. Paul Scherrer Institut 5232 Villigen PSI EURISOL Town Meeting Pisa, March 30-April 2, 2009 / W. Wagner PAUL SCHERRER INSTITUT Main goals of METEX 1-2: to investigate hydraulic and structural behaviour of the EURISOL target mock-up for various inlet flow conditions (i.e. mass flow rates) and, in particular, for nominal operating flow rate and pressure in the system. to analyse jointly the experimental results, which include inlet flow rate, pressure of the cover gas, total pressure loss, structural acceleration, sound pressure, strain data and pressure fluctuations, and numerical data obtained from various CFD (Computational Fluid Dynamics) methods.

12. Paul Scherrer Institut 5232 Villigen PSI EURISOL Town Meeting Pisa, March 30-April 2, 2009 / W. Wagner PAUL SCHERRER INSTITUT Acceleration sensors fixed on the BEW Acceleration sensors fixed on the BEW mock-up Vibration test: 30 Hz peak exists in power spectrum

13. Paul Scherrer Institut 5232 Villigen PSI EURISOL Town Meeting Pisa, March 30-April 2, 2009 / W. Wagner PAUL SCHERRER INSTITUT Simulations: 30 Hz peak Frequency [Hz] Hull Tip Displacement [mm]

14. Paul Scherrer Institut 5232 Villigen PSI EURISOL Town Meeting Pisa, March 30-April 2, 2009 / W. Wagner PAUL SCHERRER INSTITUT Strain gauge measurements A typical output in a high flow rate regime; maximum stresses around the welds at 5 MPa are well below allowable limits (65 MPa).

15. Paul Scherrer Institut 5232 Villigen PSI EURISOL Town Meeting Pisa, March 30-April 2, 2009 / W. Wagner PAUL SCHERRER INSTITUT Design of the External liquid metal loop

16. Paul Scherrer Institut 5232 Villigen PSI EURISOL Town Meeting Pisa, March 30-April 2, 2009 / W. Wagner PAUL SCHERRER INSTITUT HEX Hot leg Separator EMP Cold leg Drain tanks (x2) Tank hold shield External Hg-loop: conceptual design

17. Paul Scherrer Institut 5232 Villigen PSI EURISOL Town Meeting Pisa, March 30-April 2, 2009 / W. Wagner PAUL SCHERRER INSTITUT External Hg-loop: design

18. Paul Scherrer Institut 5232 Villigen PSI EURISOL Town Meeting Pisa, March 30-April 2, 2009 / W. Wagner PAUL SCHERRER INSTITUT

19. Paul Scherrer Institut 5232 Villigen PSI EURISOL Town Meeting Pisa, March 30-April 2, 2009 / W. Wagner PAUL SCHERRER INSTITUT Possible improvements to hydraulics Investigate new configurations of flow reverser, review the slit geometry. Correlate CFD/LES pressure variations with values measured in METEX2 (model assessment) Optimize the design to decrease nucleation areas for cavitation

20. Paul Scherrer Institut 5232 Villigen PSI EURISOL Town Meeting Pisa, March 30-April 2, 2009 / W. Wagner PAUL SCHERRER INSTITUT Conclusions Target mock-up demonstrated the feasibility of the compact target operation under nominal hydraulic conditions (flow ~12 l/s) for short-term operation Cavitation (when it occured) could reliably be detected by several independent methods: Laser Doppler Velocimetry method, acceleration sensors, structural noise (attached micro) and air-born noice (ear!) Flow-induced cavitation can be suppressed if the static pressure at the window is higher than p>6 bar Flow-induced vibrations of the target mock-up produced low stresses (of about 5 MPa) at the welds (which are below the allowable level, no problem!) Material fatigue of is still under investigation

21. Paul Scherrer Institut 5232 Villigen PSI EURISOL Town Meeting Pisa, March 30-April 2, 2009 / W. Wagner PAUL SCHERRER INSTITUT For more details please see posters Design of the Eurisol Converter Target METEX1: First structural – hydraulic test of the liquid metal EURISOL target mock-up METEX2: Second structural – hydraulic test of the liquid metal EURISOL target mock-up Cavitation occurrences detection with a Laser Doppler Vibrometers Design of the Eurisol Liquid Metal Loop

22. Paul Scherrer Institut 5232 Villigen PSI EURISOL Town Meeting Pisa, March 30-April 2, 2009 / W. Wagner PAUL SCHERRER INSTITUT Aknowledgement S.Dementjevs 1, R.Milenkovic 1, K.Samec 1,3, A. Kalt 1, F.Barbagallo 1, K.Thomsen 1, E.Manfrin 1, E.Platacis 2, A.Zik 2, A.Flerov 2, C.Kharoua 3 ……. – 1 Paul Scherrer Institut, CH5232 Villigen PSI, Switzerland – 2 Institute of Physics of the University of Latvia, LV-2156 Salaspils, Latvia – 3 CERN, Switzerland