WBS 1.3.2 – Production Target & Shield

1. Conceptual design and prototype testing of the water-cooled production target. Fabrication of the target and support systems is contained in WBS 1.4.4 Design, fabrication, and assembly of the 70 ton copper and tungsten water-cooled heat and radiation shield that protects the PS coils from nuclear heating and rad damage WBS 1.3.2 – Production Target & Shield Superconducting coils Heat & Radiation Shield Proton Beam Production Target Michael Hebert, UCI MECO Overview and Physics Requirements

2. Heat Shield and Radiation Loads 90 W load on cold mass 21 W/g max. on conductor 31 Mrad max. integrated dose • Heat Shield serves to minimize • Beam related heating that reduces temperature margin • Long-term radiation damage • Load on the refrigerator • Activation of possible work areas • Design based on various physics simulation codes – worst case assumed Tungsten Copper Michael Hebert, UCI MECO Overview and Physics Requirements

3. Conceptual Design Effort • C-AD looked at the heat shield conceptual design. A brief report was completed, including thermal simulation of the water cooling scheme and consideration of the assembly and installation schemes. • The lead engineer left BNL for another position before this effort reached fruitition. We are looking at the possibility that Dubna can take on this task, both for engineering and fabrication, as new MECO collaborators. • Design studies nearly entirely handled at UCI. Michael Hebert, UCI MECO Overview and Physics Requirements

4. inlet outlet highest temperature location beamdirection Current Water-Cooled Design • Pt or Au cylinder: L = 16.0 cm, R = 3.0 mm • Ti inlet & outlet pipes: 25 cm long, ID = 2.1 mm, OD = 3.2 mm • Annular coolant channel: h = 0.3 mm • Tapered inlet end reduces pressure drop across target • Water containment shell: 0.5 mm wall thickness • In MECO: Cut-away side view Michael Hebert, UCI MECO Overview and Physics Requirements

5. Target Titanium Water Production Target Physics Simulations Simulations of design parameters with GEANT3 indicate that both production target cooling methods can meet MECO physics requirements GEANT Simulations of Muon Yield Small water channel & thin containment tube costs 5% muon yield Inlet & outlet pipes and target radius should be reoptimized Tungsten target R = 3 mm, L = 16 cm Radiation-cooled   All with 3 mm OD inlet/outlet pipes  Large inlet/outlet UCI: A. Arjad, W.Molzon, M.Hebert, V.Tumakov, J.Popp Michael Hebert, UCI MECO Overview and Physics Requirements

6. Target Center Target/Water Interface 397 K Water Channel Center Titanium Tube Inner Surface Water Inlet Target Core 293 K Target and Water Temperature Under Turbulent Conditions Heat transfer calculations for turbulent flow conditions demonstrate feasibility of the cooling scheme • Turbulence calculation - unstable flow - - local fluctuations - - solutions to N-S eqs - time averaged, Dt - UCI: J.Carmona, R.Rangel, J.LaRue, J.Popp, W.Molzon Michael Hebert, UCI MECO Overview and Physics Requirements

7. Target Prototype Tests Water cooling effectiveness is being demonstrated via prototypes • Pressure drop vs. flow rate tests completed • First induction heating test completed, next test June 2003 Comparison of Prototype Data with HD Simulations Two right-turns Tapered ends Actual pressure drop is lower than simulations predict UCI: J.Popp, B.Christensen, C.Chen, W.Molzon Michael Hebert, UCI MECO Overview and Physics Requirements

8. We have tested a prototype article for flow rates, pressure drops and heat removal in induction heating tests We have not begun detailed design or beam testing Heat Shield There was an engineering effort on the heat shield at C-AD, but the engineer left the lab without completing the design document or costing the work. Costs are based upon his notes with large contingencies until we are able to complete the conceptual design WBS 1.3.2 – Status Summary • We do not have a MECO SSM for this task yet. I am hopeful that this will be taken up by a new collaborating institution Production Target Design • We have completed initial thermodynamic and hydrodynamic simulations of the water-cooled production target Michael Hebert, UCI MECO Overview and Physics Requirements

9. Cost Sheet Michael Hebert, UCI MECO Overview and Physics Requirements