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Dynamic Response of Graphitic Targets with Tantalum Cores Impacted by Pulsed 440-GeV Proton Beams
Various graphite targets with a tantalum core were exposed to 440 GeV pulsed proton beams at the HiRadMat facility at CERN. )e dynamic response was investigated by monitoring the surface velocity of the samples by laser Doppler vibrometry. )e study comprises different graphite grades, such as polycr...
Autores principales: | , , , , , , , , , |
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Lenguaje: | eng |
Publicado: |
2021
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Materias: | |
Acceso en línea: | https://dx.doi.org/10.1155/2021/8884447 http://cds.cern.ch/record/2808718 |
Sumario: | Various graphite targets with a tantalum core were exposed to 440 GeV pulsed proton beams at the HiRadMat facility at CERN.
)e dynamic response was investigated by monitoring the surface velocity of the samples by laser Doppler vibrometry. )e study
comprises different graphite grades, such as polycrystalline, expanded and carbon-fiber reinforced graphite, and low-density
graphitic foams, all candidates for beam-intercepting devices in high-power accelerators. )e purpose of the tantalum core is to
concentrate the large energy deposition in this high-density material that withstands the localized beam-induced temperature
spike. )e generated pressure waves are estimated to result in stresses of several hundred MPa which subsequently couple with the
surrounding graphite materials where they are damped. Spatial energy deposition profiles were obtained by the Monte Carlo code
FLUKA and the dynamic response was modelled using the implicit code ANSYS. Using advanced post-processing techniques,
such as fast Fourier transformation and continuous wavelet transformation, different pressure wave components are identified
and their contribution to the overall dynamic response of a two-body target and their failure mode are discussed. We show that
selected low-intensity beam impacts can be simulated using straight-forward transient coupled thermal/structural implicit
simulations. Carbon-fiber reinforced graphites exhibit large (macroscopic) mechanical strength, while their low-strength graphite
matrix is identified as a potential source of failure. )e dynamic response of low-density graphitic foams is surprisingly favourable,
indicating promising properties for the application as high-power beam dump material. |
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