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. The dynamic response was investigated by monitoring the surface velocity of the samples by laser Doppler vibrometry. The study comprises different graphite grades, such as poly...
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/2021/8884447 |
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| author | Pascal Simon Philipp Drechsel Peter Katrik Kay-Obbe Voss Philipp Bolz Fiona J. Harden Michael Guinchard Yacine Kadi Christina Trautmann Marilena Tomut |
| author_facet | Pascal Simon Philipp Drechsel Peter Katrik Kay-Obbe Voss Philipp Bolz Fiona J. Harden Michael Guinchard Yacine Kadi Christina Trautmann Marilena Tomut |
| author_sort | Pascal Simon |
| collection | DOAJ |
| description | Various graphite targets with a tantalum core were exposed to 440 GeV pulsed proton beams at the HiRadMat facility at CERN. The dynamic response was investigated by monitoring the surface velocity of the samples by laser Doppler vibrometry. The 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. The 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. The 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. The dynamic response of low-density graphitic foams is surprisingly favourable, indicating promising properties for the application as high-power beam dump material. |
| format | Article |
| id | doaj-art-288c1bbf9f92439a8ec466d1ec86d8ed |
| institution | Kabale University |
| issn | 1070-9622 1875-9203 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Shock and Vibration |
| spelling | doaj-art-288c1bbf9f92439a8ec466d1ec86d8ed2025-02-03T01:04:32ZengWileyShock and Vibration1070-96221875-92032021-01-01202110.1155/2021/88844478884447Dynamic Response of Graphitic Targets with Tantalum Cores Impacted by Pulsed 440-GeV Proton BeamsPascal Simon0Philipp Drechsel1Peter Katrik2Kay-Obbe Voss3Philipp Bolz4Fiona J. Harden5Michael Guinchard6Yacine Kadi7Christina Trautmann8Marilena Tomut9Materials Research Department, GSI Helmholtzzentrum, Darmstadt 64291, GermanyMaterials Research Department, GSI Helmholtzzentrum, Darmstadt 64291, GermanyDepartment of Materials and Earth Sciences, Technische Universität Darmstadt, Darmstadt 64287, GermanyDepartment of Materials and Earth Sciences, Technische Universität Darmstadt, Darmstadt 64287, GermanyMaterials Research Department, GSI Helmholtzzentrum, Darmstadt 64291, GermanyCERN, Geneva 1211, SwitzerlandCERN, Geneva 1211, SwitzerlandCERN, Geneva 1211, SwitzerlandMaterials Research Department, GSI Helmholtzzentrum, Darmstadt 64291, GermanyMaterials Research Department, GSI Helmholtzzentrum, Darmstadt 64291, GermanyVarious graphite targets with a tantalum core were exposed to 440 GeV pulsed proton beams at the HiRadMat facility at CERN. The dynamic response was investigated by monitoring the surface velocity of the samples by laser Doppler vibrometry. The 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. The 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. The 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. The dynamic response of low-density graphitic foams is surprisingly favourable, indicating promising properties for the application as high-power beam dump material.http://dx.doi.org/10.1155/2021/8884447 |
| spellingShingle | Pascal Simon Philipp Drechsel Peter Katrik Kay-Obbe Voss Philipp Bolz Fiona J. Harden Michael Guinchard Yacine Kadi Christina Trautmann Marilena Tomut Dynamic Response of Graphitic Targets with Tantalum Cores Impacted by Pulsed 440-GeV Proton Beams Shock and Vibration |
| title | Dynamic Response of Graphitic Targets with Tantalum Cores Impacted by Pulsed 440-GeV Proton Beams |
| title_full | Dynamic Response of Graphitic Targets with Tantalum Cores Impacted by Pulsed 440-GeV Proton Beams |
| title_fullStr | Dynamic Response of Graphitic Targets with Tantalum Cores Impacted by Pulsed 440-GeV Proton Beams |
| title_full_unstemmed | Dynamic Response of Graphitic Targets with Tantalum Cores Impacted by Pulsed 440-GeV Proton Beams |
| title_short | Dynamic Response of Graphitic Targets with Tantalum Cores Impacted by Pulsed 440-GeV Proton Beams |
| title_sort | dynamic response of graphitic targets with tantalum cores impacted by pulsed 440 gev proton beams |
| url | http://dx.doi.org/10.1155/2021/8884447 |
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