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BENE/EURISOL-DS Joint Meeting, CERN, SwitzerlandFebruary 22, 2007 1 Progress in the Liquid Mercury Multi-MW Target Design Studies Y. Kadi On behalf of.

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Presentation on theme: "BENE/EURISOL-DS Joint Meeting, CERN, SwitzerlandFebruary 22, 2007 1 Progress in the Liquid Mercury Multi-MW Target Design Studies Y. Kadi On behalf of."— Presentation transcript:

1 BENE/EURISOL-DS Joint Meeting, CERN, SwitzerlandFebruary 22, 2007 1 Progress in the Liquid Mercury Multi-MW Target Design Studies Y. Kadi On behalf of Task2 European Organization for Nuclear Research, CERN CH-1211 Geneva 23, SWITZERLAND yacine.kadi@cern.ch

2 BENE/EURISOL-DS Joint Meeting, CERN, SwitzerlandFebruary 22, 2007 2 Overview 1.Objectives of Multi-MW target task 2.Achievements since Feb. 1, 2005 3.Baseline parameters of the MMW Hg target 4.Multi-MW Hg target configurations 5.Future activities

3 BENE/EURISOL-DS Joint Meeting, CERN, SwitzerlandFebruary 22, 2007 3 Compact Hg-loop / Confined Hg-jet Window / Window-less ISOLDE n-spallation source: Ta(W)-rod mounted below the UC target (before irradiation) 1.Engineering study of the thermal hydraulics, fluid dynamics and construction materials of a window or window-free liquid-metal converter. 2.Study of an innovative waste management in the liquid Hg-loop e.g. by means of Hg distillation. 3.Engineering design and construction of a functional Hg-loop. 4.Off-line testing and validation of the thermal hydraulics and fluid dynamics. 5.Detailed planning and proposal for subsequent in-beam test in collaboration with other Hg target users. 6.Engineering design of the entire target station and its handling method EURISOL – Multi-MW Target Task Participants: CERN, IPUL, PSI  27.5 FTE Contributor: ORNL (SNS)

4 BENE/EURISOL-DS Joint Meeting, CERN, SwitzerlandFebruary 22, 2007 4 Mercury has a relatively low decay heat and no long lived radioactive isotopes Technical feasibility of Hg purification  should be verified Mercury is liquid at room temperature and hence needs no auxiliary heating Mercury produces practically no alpha-emitters with any sizable life time Mercury has the highest density of all heavy liquid metals and hence produces the brightest neutron source The choice of Hg as a Target (1)

5 BENE/EURISOL-DS Joint Meeting, CERN, SwitzerlandFebruary 22, 2007 5 Calculated decay power for 200 days of operation in a 5 MW beam W and Ta with 20 vol% D 2 O coolant Calculated neutron leakage from a target of ESS geometry for different target materials The choice of Hg as a Target (2)

6 BENE/EURISOL-DS Joint Meeting, CERN, SwitzerlandFebruary 22, 2007 6 Review of the activity over the last 2 years  Modelling of the target reference design (CERN) and nuclear characterisation using FLUKA;  Detailed CFD/FEM analysis of the 4 MW Hg window target (PSI);  Analysis of irradiated Hg samples (PSI);  Investigation of a transverse liquid film model of a windowless Hg-target (IPUL); TASK #2 – Multi-MW Target

7 BENE/EURISOL-DS Joint Meeting, CERN, SwitzerlandFebruary 22, 2007 7 Reference MMW Target Station Hg converter and secondary fission targets

8 BENE/EURISOL-DS Joint Meeting, CERN, SwitzerlandFebruary 22, 2007 8 Baseline parameters of the MMW Hg target

9 BENE/EURISOL-DS Joint Meeting, CERN, SwitzerlandFebruary 22, 2007 9 Sub-Tasks Engineering study of the Hg converter

10 BENE/EURISOL-DS Joint Meeting, CERN, SwitzerlandFebruary 22, 2007 10 Energy Deposition in the Target Acceptable power densities in the Hg. Flow pattern not optimised; maximum temperature ~260  C. Acceptable maximum temperature in the beam window (~350  C). Large temperature gradient in the window, inducing mechanical stresses above the acceptance limits. Power density (W/cm 3 /MW of beam)

11 BENE/EURISOL-DS Joint Meeting, CERN, SwitzerlandFebruary 22, 2007 11 LM Target overall layout

12 BENE/EURISOL-DS Joint Meeting, CERN, SwitzerlandFebruary 22, 2007 12 Thermo - Structural Analysis of the Target Window

13 BENE/EURISOL-DS Joint Meeting, CERN, SwitzerlandFebruary 22, 2007 13 Sub-Tasks Engineering design and construction of a functional Hg loop Test of Hg loop components

14 BENE/EURISOL-DS Joint Meeting, CERN, SwitzerlandFebruary 22, 2007 14  Off-line testing and validation of the thermal hydraulics and fluid dynamics: IPUL carried out the design, construction and testing of a high pressure water-jet module based on the windowless Hg-jet configuration proposed in the EURISOL-RTD. Analysis of the experimental results showed a considerable number of obstacles in the production of such a metal jet Alternative Target Configuration

15 BENE/EURISOL-DS Joint Meeting, CERN, SwitzerlandFebruary 22, 2007 15 UCx (  =15 mm) Graphite (1 mm) Ta Resistance (0.5 mm) W Triple Thermal Sheet (150  m total) W Container (1 mm) BeO (  =15 mm) Alternative Hg Target Configuration

16 BENE/EURISOL-DS Joint Meeting, CERN, SwitzerlandFebruary 22, 2007 16 Proposed transverse liquid film model of the MMW Hg-target (windowless) Alternative Hg Target Configuration

17 BENE/EURISOL-DS Joint Meeting, CERN, SwitzerlandFebruary 22, 2007 17 Sub-Tasks Decision on optimum extraction method

18 BENE/EURISOL-DS Joint Meeting, CERN, SwitzerlandFebruary 22, 2007 18 Setup of inert gas equipment

19 BENE/EURISOL-DS Joint Meeting, CERN, SwitzerlandFebruary 22, 2007 19 Hf and Lu present as an oxide deposit on Hg were removed by contacting the liquid metal with oxide materials with a rough surface: Sintered corundum Molecular sieve Oxides stick to the surface of these materials Removal of Lu and Hf-nuclides from CERN-Hg sample

20 BENE/EURISOL-DS Joint Meeting, CERN, SwitzerlandFebruary 22, 2007 20  Engineering Study of the liquid metal converter: 1.Modelling of transients ==> CW or pulse 2.Design of the entrance and exit flow conditions of the target (sizing of the target) 3.Assessment of the possibility of a one directional flow target  Innovative Waste Management: 1.Test candidate materials for a metal gauze absorber for radionuclides in Hg 2.Prepare solutions of selected radionuclides in Hg by neutron activation and chemical reactions. Study their behaviour, e.g solubility, oxidation etc. to figure out the reason for their apparent separation from Hg in the CERN samples 3.Additional funding required to procure a commercial glove box system with gas purification unit Perspectives

21 BENE/EURISOL-DS Joint Meeting, CERN, SwitzerlandFebruary 22, 2007 21  Engineering Design and construction of a functional liquid Hg loop: 1.Adapt InGaSn Experimental loop for windowless Hg-jet solution 2.Adapt MEGAPIE loop for the cusped shaped reference solution 3.Additional funding required for prototyping  Engineering design of the entire target station : 1.Requirements for radiation protection of the multi-MW power target station 2.Propose options for the minimization of dose rates, activation, material handling and interventions, during and after operation 3.Integration studies of the fission target Perspectives

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