fp6 design study "diracsecondary beams" "nustar":experiments with stored...
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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, Pmax = 12 kW (for 1012 238U ions/s)
Rotating graphite wheel
2. Fast extraction: ≈ 50 ns spills, Pmax = 12 kJ/50 ns = 240 GW!
Liquid-metal jet?
FP6 Design study "DIRACsecondary beams"Project "NUSTAR":Experiments with stored radioactive beamsTask 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 target3. Thermo-mechanical calculations for the final design 4. Experimental verification of these calculations5. 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)
Work package 1:Calculations of energy deposition etc.
1. Calculations for the slow-extraction scheme:
ANSYS Workbench B. Achenbach
2. Calculations for the fast-extraction scheme:
Solid Graphite Target:•BIG2•ANSYS•soon: LS-DYNA•future: AUTODYN
N. TahirB. AchenbachB. AchenbachCERN (R.Wilfinger et al.)
Liquid-Lithium Target:•BIG2•CFDLIB
N. TahirA. Tauschwitz
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/cm2 Graphite
Work package 3:Heat deposition in final design
40Ar 136Xe 238U
8 g/cm2 6 g/cm2 4 g/cm2
0.83 kW 6 kW 12 kW
240 ºC 540 ºC 750 ºC
1012 ions/s; 1 Hz rotation frequency, Gaussian profile with σy = 2mm
ANSYS B. Achenbach
Work package 3:Mechanical and thermal boundary conditions
Stress distribution
max. 22 MPa
Temperatures at the hub
max. 35 ºClimit: 150 ºC
Beam:1012 238U/s12 kW
ANSYS B. Achenbach
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 238U beams?
ANSYS calculation for 1010 238U ions/50 ns:
P/M = 233 J/gΔT = 230 ºCσmax= 8 MPa << 40 MPa
Temperature and stress in 4 g/cm² graphite cube120 J / 50 ns gaussian beam
(sigma_x = 1 mm, sigma_y = 2 mm)
0.00E+00
2.00E+06
4.00E+06
6.00E+06
8.00E+06
1.00E+07
1.20E+07
1.40E+07
0.0 0.2 0.4 0.6 0.8 1.0
Time [s]
Str
ess
[Pa]
0
40
80
120
160
200
240
280
Tem
p [°
C]
Stress ANSYS [Pa]
Stress (T) = E * alpha (T) * (T - T_0) [Pa]
Tem p [°C]
S334: Accepted SIS experimentMeasurements of stress waves in graphitewith Laser Doppler vibrometer together with R. Wilfinger et al. (CERN)
Work package 5:Feasibility study of liquid-metal jet target
Step 1: Water Jet ModelWater test loop available, measurements have started in Nov. 2006
Step 2: Liquid-Na jetNa test loop being assembled, measurements will start in spring 2007
Step 3: Liquid-Li jetComponents 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.
Work package 5:Feasibility study of liquid-metal jet target
Step 1: Water simulation:
Work package 5:Feasibility study of liquid-metal jet target
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)
Task 6 "NUSTAR1" Cost Table
NUSTAR1 GSI FZK
total EC Contr. total EC Contr.
Personnel 48 PM 24 PM 48 PM 24 PM
Consumables 140 k€ 70 k€
Total 462 k€ 231 k€ 492 k€ 246 k€
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