1. FP6 Design study "DIRACsecondary Beams" "NUSTAR":Experiments with stored radioactive beams Goals of Task 6: Research and development to handle the energy deposition of high-intensity primary beams in the production target Design and prototype construction of a rotating target wheel Feasibility study and prototype construction of a liquid-metal target Task 6: High-power production targets for fast-extracted beams K.Sümmerer (GSI) Super-FRS high-power production target: has to cover two totally different regimes: 1.Slow extraction: ≈ 1 s spills, P max = 12 kW (for 10 12 238 U ions/s)  Rotating graphite wheel 2.Fast extraction: ≈ 50 ns spills, P max = 12 kJ/50 ns = 240 GW!  Liquid-metal jet?

2. FP6 Design study "DIRACsecondary beams" Project "NUSTAR":Experiments with stored radioactive beams Task 6: High-power production targets for fast-extracted beams Detailed work packages: 1.3-dim. theoretical calculations of the energy deposition, temperature and pressure in various materials 2.Technical design of a rotating graphite-wheel target 3.Thermo-mechanical calculations for the final design 4.Experimental verification of these calculations 5.Feasibility study and prototype construction of a liquid-metal target for fast extraction Milestones: Conceptual Design Target Wheel (month 24) Conceptual Design Liquid-Metal Target (month 36) Prototype Liquid-Metal Target (month 36)

3. Work package 1: Calculations of energy deposition etc. 1. Calculations for the slow-extraction scheme: ANSYS WorkbenchB. Achenbach 2. Calculations for the fast-extraction scheme: Solid Graphite Target: BIG2 ANSYS soon: LS-DYNA future: AUTODYN N. Tahir B. Achenbach CERN (R.Wilfinger et al.) Liquid-Lithium Target: BIG2 CFDLIB N. Tahir A. Tauschwitz

4. Work package 2: Engineering design of rotating wheel target Model: PSI Target E (G. Heidenreich et al.) 5 Thickness steps: 1, 2.5, 4, 6, 8 g/cm 2 Graphite

5. Work package 3: Heat deposition in final design 40 Ar 136 Xe 238 U 8 g/cm 2 6 g/cm 2 4 g/cm 2 0.83 kW6 kW12 kW 240 ºC540 ºC750 ºC 10 12 ions/s; 1 Hz rotation frequency, Gaussian profile with σ y = 2mm ANSYS B. Achenbach

6. Work package 3: Mechanical and thermal boundary conditions Stress distribution max. 22 MPa Temperatures at the hub max. 35 ºC limit: 150 ºC Beam: 10 12 238 U/s 12 kW ANSYS B. Achenbach

7. Work package 4: Experimental verification of temperature and stress What is the limiting energy density for graphite as a fast-extraction target for high-intensity 238 U beams? ANSYS calculation for 10 10 238 U ions/50 ns: P/M = 233 J/g ΔT = 230 ºC σ max = 8 MPa << 40 MPa S334: Accepted SIS experiment Measurements of stress waves in graphite with Laser Doppler vibrometer together with R. Wilfinger et al. (CERN)

8. Work package 5: Feasibility study of liquid-metal jet target Step 1: Water Jet Model Water test loop available, measurements have started in Nov. 2006 Step 2: Liquid-Na jet Na test loop being assembled, measurements will start in spring 2007 Step 3: Liquid-Li jet Components are in house Leading participant: L.Stoppel, S.Gnieser, S.Gordeev, M.Daubner, R.Stieglitz and the KALLA team ANL liquid Li jet: J. Nolen, C. Reed et al.

9. Work package 5: Feasibility study of liquid-metal jet target Step 1: Water simulation:

10. Work package 5: Feasibility study of liquid-metal jet target

11. Outlook To Do-list for the work packages in 2007: 1.Theoretical calculations: continue work on fast-extraction scheme (LS-DYNA, AUTODYN) 2.Report on Technical Design of a Rotating Graphite-Wheel Target due 29-JAN- 2007; build and test prototype 3.Thermal calculations: Work package completed 4.Perform experiment S334: measure thermal stress waves for fast-extracted SIS18 beams in graphite samples with Laser Doppler vibrometer 5.Continue feasibility studies of a liquid-metal target for fast extraction with water and liq. Na jets. Contributors to NUSTAR Task 6: B.Achenbach, K.-H.Behr, A.Bruenle, H.Geissel, C.Karagiannis, A.Kelic, B.Kindler, B.Lommel, K.Sümmerer, N.Tahir, M.Tomut, C.Trautmann, H.Weick, M.Winkler (GSI) C.H.M.Broeders, M.Daubner, S.Gnieser, S.Gordeev, A.Konobeev, R.Stieglitz, L.Stoppel (FZK) J.Maruhn, A.Tauschwitz (Uni Frankfurt) J.Lettry, H.Richter, R.Wilfinger (CERN)

12. Task 6 "NUSTAR1" Cost Table NUSTAR1 GSIFZK totalEC Contr.totalEC Contr. Personnel48 PM24 PM48 PM24 PM Consumables140 k€70 k€ Total462 k€231 k€492 k€246 k€