Dynamic Radiation Effects Induced by Short-Pulsed GeV U-Ion Beams in Graphite and h-BN Targets
Targets of isotropic graphite and hexagonal boron nitride were exposed to short pulses of uranium ions with ∼1 GeV kinetic energy. The deposited power density of ∼3 MW/cm³ generates thermal stress in the samples leading to pressure waves. The velocity of the respective motion of the target surface w...
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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/10.1155/2021/8825142 |
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| author | Philipp Bolz Philipp Drechsel Alexey Prosvetov Pascal Simon Christina Trautmann Marilena Tomut |
| author_facet | Philipp Bolz Philipp Drechsel Alexey Prosvetov Pascal Simon Christina Trautmann Marilena Tomut |
| author_sort | Philipp Bolz |
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| description | Targets of isotropic graphite and hexagonal boron nitride were exposed to short pulses of uranium ions with ∼1 GeV kinetic energy. The deposited power density of ∼3 MW/cm³ generates thermal stress in the samples leading to pressure waves. The velocity of the respective motion of the target surface was measured by laser Doppler vibrometry. The bending modes are identified as the dominant components in the velocity signal recorded as a function of time. With accumulated radiation damage, the bending mode frequency shifts towards higher values. Based on this shift, Young’s modulus of irradiated isotropic graphite is determined by comparison with ANSYS simulations. The increase of Young’s modulus up to 3 times the pristine value for the highest accumulated fluence of 3 × 1013 ions/cm2 is attributed to the beam-induced microstructural evolution into a disordered structure similar to glassy carbon. Young’s modulus values deduced from microindentation measurements are similar, confirming the validity of the method. Beam-induced stress waves remain in the elastic regime, and no large-scale damage can be observed in graphite. Hexagonal boron nitride shows lower radiation resistance. Circular cracks are generated already at low fluences, risking material failure when applied in high-dose environment. |
| format | Article |
| id | doaj-art-b2a9d0a35adf4de185c0346a89daf6d4 |
| institution | OA Journals |
| issn | 1070-9622 1875-9203 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
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| series | Shock and Vibration |
| spelling | doaj-art-b2a9d0a35adf4de185c0346a89daf6d42025-08-20T02:23:24ZengWileyShock and Vibration1070-96221875-92032021-01-01202110.1155/2021/88251428825142Dynamic Radiation Effects Induced by Short-Pulsed GeV U-Ion Beams in Graphite and h-BN TargetsPhilipp Bolz0Philipp Drechsel1Alexey Prosvetov2Pascal Simon3Christina Trautmann4Marilena Tomut5Materials Research Department, GSI Helmholtz Center for Heavy Ion Research, Planckstr 1, Darmstadt 64291, GermanyMaterials Research Department, GSI Helmholtz Center for Heavy Ion Research, Planckstr 1, Darmstadt 64291, GermanyMaterials Research Department, GSI Helmholtz Center for Heavy Ion Research, Planckstr 1, Darmstadt 64291, GermanyMaterials Research Department, GSI Helmholtz Center for Heavy Ion Research, Planckstr 1, Darmstadt 64291, GermanyMaterials Research Department, GSI Helmholtz Center for Heavy Ion Research, Planckstr 1, Darmstadt 64291, GermanyMaterials Research Department, GSI Helmholtz Center for Heavy Ion Research, Planckstr 1, Darmstadt 64291, GermanyTargets of isotropic graphite and hexagonal boron nitride were exposed to short pulses of uranium ions with ∼1 GeV kinetic energy. The deposited power density of ∼3 MW/cm³ generates thermal stress in the samples leading to pressure waves. The velocity of the respective motion of the target surface was measured by laser Doppler vibrometry. The bending modes are identified as the dominant components in the velocity signal recorded as a function of time. With accumulated radiation damage, the bending mode frequency shifts towards higher values. Based on this shift, Young’s modulus of irradiated isotropic graphite is determined by comparison with ANSYS simulations. The increase of Young’s modulus up to 3 times the pristine value for the highest accumulated fluence of 3 × 1013 ions/cm2 is attributed to the beam-induced microstructural evolution into a disordered structure similar to glassy carbon. Young’s modulus values deduced from microindentation measurements are similar, confirming the validity of the method. Beam-induced stress waves remain in the elastic regime, and no large-scale damage can be observed in graphite. Hexagonal boron nitride shows lower radiation resistance. Circular cracks are generated already at low fluences, risking material failure when applied in high-dose environment.http://dx.doi.org/10.1155/2021/8825142 |
| spellingShingle | Philipp Bolz Philipp Drechsel Alexey Prosvetov Pascal Simon Christina Trautmann Marilena Tomut Dynamic Radiation Effects Induced by Short-Pulsed GeV U-Ion Beams in Graphite and h-BN Targets Shock and Vibration |
| title | Dynamic Radiation Effects Induced by Short-Pulsed GeV U-Ion Beams in Graphite and h-BN Targets |
| title_full | Dynamic Radiation Effects Induced by Short-Pulsed GeV U-Ion Beams in Graphite and h-BN Targets |
| title_fullStr | Dynamic Radiation Effects Induced by Short-Pulsed GeV U-Ion Beams in Graphite and h-BN Targets |
| title_full_unstemmed | Dynamic Radiation Effects Induced by Short-Pulsed GeV U-Ion Beams in Graphite and h-BN Targets |
| title_short | Dynamic Radiation Effects Induced by Short-Pulsed GeV U-Ion Beams in Graphite and h-BN Targets |
| title_sort | dynamic radiation effects induced by short pulsed gev u ion beams in graphite and h bn targets |
| url | http://dx.doi.org/10.1155/2021/8825142 |
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