FP6 Design study "DIRAC secondary beams" Project "NUSTAR":Experiments with stored radioactive beams

1
FP6 Design study "DIRAC secondary beams"Project
"NUSTAR"Experiments with stored radioactive
beams
Task 6 High-power production targets for
fast-extracted beamsK.Sümmerer (GSI)
Super-FRS high-power production target has to
cover two totally different regimes

1. Slow extraction 1 second spills, P 12 kW
2. Fast extraction 50 ns spills, P 12 kJ/50 ns
   240 GW!

2
FP6 Design study "DIRACsecondary beams"Project
"NUSTAR"Experiments with stored radioactive
beamsTask 6 High-power production targets for
fast-extracted beams
3
Super-FRS target for slow extraction
PSI rotating graphite wheel is a suitable model
for Super-FRS target for slow extraction!
Facility Beam Total Beam Energy E kJ Target Thickness g cm-2 Deposited Energy ?E kJ Specific Energy ?E/M kJ/g
PSI protons 1x1016/s 1000 10.8 54 0.18
Super-FRS all ions 1x1012/s ? 40 1.0 8.0 ? 12 ? 0.17
beam energy 1 A GeV, beam spot radius of 1 mm,
target (rt 15 cm) rotates with 60 rpm, beam
hits target at rb 14 cm.
4
PSI target for slow extraction(G.Heidenreich,
PSI)
PSI Target E
Vertical plug handling concept at Super-FRS
5
Work plan for NUSTAR1 / Task 6

• Rotating graphite wheel target
• Explore theoretical concepts of energy
  deposition/transport
• Engineering design
• Calculate temperature response of realistic
  geometry
• Prototype for long-term/beam testing
• Radiation damage/annealing
• Media connection, shielding, handling, repairs

GSI
6
Super-FRS targets for fast extraction
7
Response of liquid-Li jet to fast SIS pulses

• 2-dim. BIG-2 calculations by N. Tahir
• Tmax on beam trajectory 13 000 K
• evaporated Li is ejected in/against beam
  direction with v0 10 km/s
• shock front travels with 1.5 km/s perpendicular
  to beam direction
• shock pressure still 2 GPa after 1 µs

to 50 ns
t1 1 µs
8
Work plan for NUSTAR1 / Task 6

• Liquid-metal jet target
• 3-dim. hydro-dynamical calculations comparison
  to 2-dim. calculations
• Define beam spot size where Li does not vaporize
• Feasibility study (water model, Na model)
• Prototype Li loop
• Technical (safety and vacuum) concept (incl.
  handling)

FZK
9
Task 6 "NUSTAR1" Cost Table
NUSTAR1 GSI GSI FZK 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