Harold G. Kirk Brookhaven National Laboratory Post-Irradiation Properties of Candidate Materials for High-Power Targets PAC05 Knoxville, TN May 16-20,

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Presentation transcript:

Harold G. Kirk Brookhaven National Laboratory Post-Irradiation Properties of Candidate Materials for High-Power Targets PAC05 Knoxville, TN May 16-20, 2005

Harold G. Kirk Pressure Wave Amplitude Stress = Y α T U / C V Where Y = Material modulus α T = Coefficient of Thermal Expansion U = Energy deposition C V = Material heat capacity When the pressure wave amplitude exceeds material tensile strength then target rupture can occur. This limit is material dependant.

Harold G. Kirk E951: Graphite & Carbon-Carbon Targets ATJCC X/U Y, GPa1054/5.3 α T, / 0 K 2.5~0 Tensile Strength, MPa 15182/44 Key Material Properties

Harold G. Kirk 24 GeV, 3 x protons/pulse E951: Strain Gauge Measurements

Harold G. Kirk Target Material Examples Peter Thieberger, BNL Consider the case of a 16 x 10 12, 3ns, 24 GeV proton pulses Beam Induced Stress Material Yield Strength

Harold G. Kirk Super-Invar Irradiation at BNL (2002) The target basket after irradiation The cylindrical samples of super-invar. Dilatometer in Hot Cell Tensile Tester in Hot Cell

Harold G. Kirk Super-Invar CTE measurements Peak Proton fluence 1.3 x protons/cm 2

Harold G. Kirk Super-Invar Tensile Testing Tensile testing shows that Super-Invar strengthens while remaining ductile (at the 0.25 dpa level)

Harold G. Kirk Irradiation at BNL (2004)

Harold G. Kirk Material Test Matrix Carbon-Carbon composite : Low-Z, low CTE composite that may potentially minimize thermal shock and survive high intensity pulses. Graphite (IG43) : Different graphite grades respond differently to irradiation Titanium Ti-6Al-4V alloy : Irradiation effects on fracture toughness of alloy that combines good tensile strength and relatively low CTE are sought Toyota’s “Gum” Metal : “Super” alloy exhibiting ultra-low elastic modulus, high strength, super-elastic like nature and near-zero linear expansion coefficient for the temperature range -200 C to +250 C Vascomax : High-strength, high-Z alloy. Irradiation effects on CTE, fracture toughness and ductility loss are sought. Beryllium : Known material examined closer for irradiation damage AlBeMet : Low-Z composite combining good properties of Be and Aluminum. Nickel-plated Aluminum (NUMI horn) : Assess how bonding between the layer and the substrate survive irradiation in the presence of water Super-Invar : Re-examination of previously tested material for effects of temperature induced annealing

Harold G. Kirk Carbon-Carbon Composite Average Proton Fluence ( protons/cm 2 ) 0.76 { 0.52 and none

Harold G. Kirk C-C Composite Thermal Cycles XYZ OrientationUV Orientation

Harold G. Kirk CTE resetting of Super-Invar Invar resets its CTE after a C thermal cycle

Harold G. Kirk Super-Invar thermal cylcles

Harold G. Kirk Additional CTE Results

Harold G. Kirk Initial Tensile Results Gum Metal strengthens but turns brittleVascomax strengthens without turning brittle.

Harold G. Kirk The Collaborators H. Kirk, H. Ludewig, L. Mausner, N. Simos, P. Thieberger Brookhaven National Laboratory K. McDonald Princeton University J. Sheppard Stanford Linear Accelerator Center L. P. Trung Stony Brook University Y. Hayato, K. Yoshimura KEK