material irradiation studies for high-intensity … · material irradiation studies for...
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MATERIAL IRRADIATION STUDIES FOR
HIGH-INTENSITY PROTON BEAM TARGETSCurrent & Future Activities
N. Simos and H. Kirk, BNL
contribution from• P. Thieberger, W-T. Weng, L. Mausner, H. Ludewig, PT. Trung (BNL)• K. McDonald, Princeton , J. Sheppard, SLAC• K. Yoshimura and Y. Hayato, KEK• N. Mokhov & P. Hurh (FNAL)
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2-4 MW ????What do we need to get us there:• low elasticity modulus (remember ~ E T)• low thermal expansion• high heat capacity • good diffusivity to move heat away from hot spots• high strength • resilience to shock/fracture strength• resilience to irradiation damage • Other than that, we are not asking for much!!!!
And another thing: 4 MW on what spot size?
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Is there hope?Several “smart” materials or new composites may be able to meet some of
the desired requirements:- new graphite grades- customized carbon-carbon composites - Super-alloys (gum metal, albemet, super-invar, etc.)
While calculations based on non-irradiated material properties may show that it is possible to achieve 2 or even 4 MW, irradiation effects may completely change the outlook of a material candidate
ONLY way is to test the material to conditions similar to those expected during its life time as target
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What are we after?
• High Intensity/High Power Targets• Low Z or high Z• Alloys, composites, “smart” materials• Assessment of irradiation damage of these
non-traditional materials• Driving target scenarios to their limit
through simulations – Use experimental data to back-feed the simulations.
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Target Studies• Beam on targets (E951)• Material irradiation• New activities
– more irradiation studies/beam on targets (p-bar at FNAL)– Laser-based shock studies
• Simulations and benchmarking– ANSYS & LS-DYNA
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24 GeV AGS Protons on Targets: Graphite & CC Composite TargetsBeam Windows (thick, target-like and thin)
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Experimental vs. simulation (ANSYS) prediction of graphite target responseHADRON CALCULATIONS BENCHMARKING
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Beam Window Experiment (E951) Experimental Strain Data vs. Simulation
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IRRADIATION STUDIESCarbon-Carbon Composite in Target
AssemblyPHASE I:• Super Invar
• Inconel-718
PHASE II:
Nickel-plated aluminum in target assembly (goal is to find out how
irradiation affects bonding)• 3D Carbon-Carbon Composite • Toyota “Gum Metal”• Graphite (IG-43) • AlBeMet • Beryllium • Ti Alloy (6Al-4V) • Vascomax • Nickel-Plated Alum.
BEAM PARAMETERS
200/117 MeV protons; ~ 70 µA
Spot size FWHM ~ 14 mm
PHASE II-a:•2D Carbon-Carbon Composite
BEAM
Complex assembly of target materials
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Irradiation Temperature Assessment Using Thermal Sensitive Paint (TSP)
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Dilatometer and Tensile Testing Arrangement at BNL Hot Cell FacilityUsed in Post-Irradiation Study
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WHY DO WE WANT TO DO THESE TESTS?
Non-irradiated HORN material
Ni-plated material AFTER irradiation
Is nickel-plating the way to prolong life of HORN?Jury is still out BUT preliminary assessment not favorable
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CC composite “annealing” behavior
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WHY Carbon-Carbon and not graphite?
IRRADIATION EFFECTS ON GRAPHITE
Irradiation has a profound effect on thermal conductivity/diffusivity
CC composite at least allows for fiber customization and thus significant improvement of conductivity.
NOTE that assessment of irradiation effects on conductivity of CC composite yet to be completed
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Super Invar: Serious candidate?
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GUM Metal
90% cold-worked may be of interest (if it holds these properties after irradiation)
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Ti alloy (6Al-4V)VascomaxV a sc oma x S t re ss-S t ra in
0
200
400
600
800
1000
1200
1400
0 10 20 30 40
st r a in (% )
Unirrad iated
Vasc o-22
Vasc o-23
Vasc o-24
Tit a nium Alloy (Ti-6 Al- 4 v) S t re ss-S t ra in Re la t ionship
0
200
400
600
800
1000
1200
0 10 20 30 40
(p se u d o ) S t ra in (% )
Ti_03_unirrad
Ti-04
Ti-08
Ti-06
Ti-05
Ti-04
0
100
200
300
400
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600
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0 10 20 30 40 50
Elongation (%)
Stre
ss (M
Pa)
Ti-6Al-4V (unirradiated)
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AlBeMet
S t re ss- S t ra in Re la t ion in AlBe Me t
0
50
100
150
200
250
300
350
400
0 10 20 30 40
(p se u d o ) S t ra in (% )
A lBemet_04
A lBeMet_03
A lBeMet (un irrad ia ted)
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2D carbon-carbon Irradiation at BNL BLIP Facility
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Preliminary 2D carbon-carbon post-irradiation
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2D carbon-carbon post-irradiation
Company provided data on the 2D CC Material irradiatedNOTE: Results shown are in terms of Coefficient of Thermal Expansion
AC150 and AC200 Processed @ 2,500 C - C.T.E. (10-6/K)
-2.00
0.00
2.00
4.00
6.00
8.00
10.00
12.00
50 100 150 200 250 300 350 400 450 500 550 600 (degree C)
C.T.E. (10-6/K)
AC150 Lengthwise (in xand y)AC150 Thickness-wise(in z)AC200 Lengthwise (in xand y)AC200 Thickness-wise(in z)
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Post Irradiation Activities
• CTE measurements on 2-D carbon composite
• Testing of graphite and Carbon-Carbon to cycles up to 1100 C • in vacuum• with forced helium
• Thermal diffusivity and electrical resistivity measurements of the irradiated material matrix
• Closer examination of the Ni-plated aluminum for de-lamination,resistivity changes
• Damage assessment for defect generation/growth on specimens using ultrasonic techniques (more of an issue in graphite & CC)
• Studies suggest that loss of strength is the direct result of irradiation-induced loss of “cold-work”. Relate that to the performance of gum metal
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Future Target Studies at Pbar Facility (FNAL)
What we hope to get out of it ?
-Shock induced failure
- Information regarding damage at different doses and at different different ratios of protons to neutrons
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