Transcript High Power Target R&D Simulations N. Simos Brookhaven National Lab May 1-2, Oxford U., UK BROOKHAVEN SCIENCE ASSOCIATES.

High Power Target R&D
Simulations
N. Simos
Brookhaven National Lab
May 1-2, Oxford U., UK
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Exploring Eulerian-Lagrangian Formulation Capabilities of LS-DYNA
Proton Beam - Hg Jet Interaction Experiment
High velocity projectiles
emanating from Hg target
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Relevance to Hg Jet: Jet nozzle survivability
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Hg Explosion Simulations
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Hg explosions and Target Infrastructure
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Superbeam Target Concept
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Overview of R&D Realized to-date on Solid Targets
• Target Shock Studies
• Radiation damage Studies
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Solid Targets
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Target Shock Studies
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Beam-induced shock on thin targets
experiment
prediction
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Pulse Structure
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Solid Target Shock Studies
•
Graphite and Carbon composites
•
super-alloys
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Materials “appear” more shock resilient than
conventional estimates
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Thermal Conductivity
3-D CC (~ 0.2 dpa) conductivity reduces by a factor of 3.2
2-D CC (~0.2 dpa) measured under irradiated conditions (to
be compared with company data)
Graphite (~0.2 dpa) conductivity reduces by a factor of 6
W (1+ dpa)

Ta (1+ dpa)

~ 40% reduction
Ti-6Al-4V (~ 1dpa)

~ 10% reduction
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reduced by factor of ~4
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Radiation Damage in Carbon-Carbon Composites
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Radiation Damage in Carbon-Carbon Composites and Graphite
2-D carbon
3-D carbon
graphite
[fluence ~10^21 p/cm2]
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“annealing” of super-Invar
ONGOING 3rd irradiation phase: neutron
exposure
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Radiation Damage of Super Alloy “Gum” metal
Enhancement of properties
are attributed to the
“dislocation-free” plastic
deformation mechanism
Super ductility completely
disappears with irradiation
As observed in other studies (AlMg-alloy)
0.2 dpa was enough to remove cold-work microstructure
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Radiation Damage Studies – High-Z Materials
Tantalum
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Tantalum
600
Ta_Sample-2
Ta_Sample-1
500
300
200
100
Tantalum Stress-Strain Variability (0 dpa)
0
0
1
2
3
4
5
6
Displacement (mm)
300
Ta_0 dpa
250
200
Stress (MPa)
Load (N)
400
150
100
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Stress-Strain Relation of Tantalum
0
0
2
4
6
8
10
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strain (%)
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Tungsten
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Tungsten
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NEXT STEP ?
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Focus on irradiation damage and thermal
shock/fatigue of key components that could be the
limiting factors in the lifetime of the overall
experiments
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Appreciate the value of multi-physics based
simulations for the engineering side of things (where
actual limitations lie) and use them to push the
envelope
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