Metternich, Martin (2023)
Shaping of laser-accelerated ion beams for applications in high energy density physics.
Technische Universität Darmstadt
doi: 10.26083/tuprints-00024395
Dissertation, Erstveröffentlichung, Verlagsversion
Kurzbeschreibung (Abstract)
The goal of this work was the generation of a suitable ion beam for specific applications with a laser-driven ion beamline, which was realized within the Laser Ion Generation Handling and Transport (LIGHT) collaboration at GSI Helmholtzzentrum für Schwerionenforschung GmbH. For this purpose, the influence of the beam shaping on the initial properties of the laser-generated ion beam has first been characterized in detail. In addition, equations have been derived to calculate the required magnetic and electric field strengths of the beamline components for the applications under investigation. These findings have then been used to determine the optimal setup of the LIGHT beamline for the following three applications:
• The injection of the ion beam into the heavy ion synchrotron SIS18 at GSI
• The generation and investigation of high proton fluxes
• The generation of a suitable ion beam for the measurement of the stopping power of dense, highly ionized plasmas
Subsequently, the expected beam parameters for these setups were determined by numerical simulations and verified experimentally. According to the numerical simulations, the current setup of the LIGHT beamline can inject 3 × 10⁸ protons with an energy of 11.4 MeV into the SIS18 synchrotron at GSI in one shot. Since the synchrotron can accommodate more than 10¹⁰ protons, proposals have also been elaborated to increase the number of particles for this application. With respect to the generation of high proton fluxes, in an experimental campaign that was carried out as part of this work, a proton bunch with (7.72 ± 0.14) MeV and a particle flux of (3.28 ± 0.24) × 10⁸ ns⁻¹ mm⁻² was achieved. Of particular note is the temporal width of this proton bunch, which was only (742 ± 40) ps (FWHM). Furthermore, the corresponding simulations for this experiment revealed that the cross-shaped ion beam profile in pulsed high-field solenoid beamlines, which is shown on the cover of this thesis, is caused by the magnetic field of the connecting cables of the solenoid magnets. These results have been published in [Metternich et al., 2022]. Finally, the generation of a suitable ion beam for measuring the stopping power of dense, highly ionized plasmas was investigated and experimentally performed using the LIGHT beamline. The resulting ion beam had an energy of (0.60 ± 0.02) MeV u⁻¹ and a temporal width of (1.23 ± 0.04) ns (FWHM). Moreover, it could be estimated that (2.0 ± 0.6) × 10⁶ carbon ions of this bunch will penetrate the spatially homogeneous region of the plasma under investigation in the planned experiment, i.e., three orders of magnitude more particles than in previous measurements at GSI with a temporal bunch width comparatively almost five times shorter. The measurement of the stopping power of dense, highly ionized plasmas with the beam parameters achieved in this work should therefore lead to much lower measurement uncertainties than in the experiments performed so far.
Typ des Eintrags: | Dissertation | ||||
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Erschienen: | 2023 | ||||
Autor(en): | Metternich, Martin | ||||
Art des Eintrags: | Erstveröffentlichung | ||||
Titel: | Shaping of laser-accelerated ion beams for applications in high energy density physics | ||||
Sprache: | Englisch | ||||
Referenten: | Roth, Prof. Dr. Markus ; Bagnoud, Prof. Dr. Vincent | ||||
Publikationsjahr: | 2023 | ||||
Ort: | Darmstadt | ||||
Kollation: | x, 110 Seiten | ||||
Datum der mündlichen Prüfung: | 15 Februar 2023 | ||||
DOI: | 10.26083/tuprints-00024395 | ||||
URL / URN: | https://tuprints.ulb.tu-darmstadt.de/24395 | ||||
Kurzbeschreibung (Abstract): | The goal of this work was the generation of a suitable ion beam for specific applications with a laser-driven ion beamline, which was realized within the Laser Ion Generation Handling and Transport (LIGHT) collaboration at GSI Helmholtzzentrum für Schwerionenforschung GmbH. For this purpose, the influence of the beam shaping on the initial properties of the laser-generated ion beam has first been characterized in detail. In addition, equations have been derived to calculate the required magnetic and electric field strengths of the beamline components for the applications under investigation. These findings have then been used to determine the optimal setup of the LIGHT beamline for the following three applications: • The injection of the ion beam into the heavy ion synchrotron SIS18 at GSI • The generation and investigation of high proton fluxes • The generation of a suitable ion beam for the measurement of the stopping power of dense, highly ionized plasmas Subsequently, the expected beam parameters for these setups were determined by numerical simulations and verified experimentally. According to the numerical simulations, the current setup of the LIGHT beamline can inject 3 × 10⁸ protons with an energy of 11.4 MeV into the SIS18 synchrotron at GSI in one shot. Since the synchrotron can accommodate more than 10¹⁰ protons, proposals have also been elaborated to increase the number of particles for this application. With respect to the generation of high proton fluxes, in an experimental campaign that was carried out as part of this work, a proton bunch with (7.72 ± 0.14) MeV and a particle flux of (3.28 ± 0.24) × 10⁸ ns⁻¹ mm⁻² was achieved. Of particular note is the temporal width of this proton bunch, which was only (742 ± 40) ps (FWHM). Furthermore, the corresponding simulations for this experiment revealed that the cross-shaped ion beam profile in pulsed high-field solenoid beamlines, which is shown on the cover of this thesis, is caused by the magnetic field of the connecting cables of the solenoid magnets. These results have been published in [Metternich et al., 2022]. Finally, the generation of a suitable ion beam for measuring the stopping power of dense, highly ionized plasmas was investigated and experimentally performed using the LIGHT beamline. The resulting ion beam had an energy of (0.60 ± 0.02) MeV u⁻¹ and a temporal width of (1.23 ± 0.04) ns (FWHM). Moreover, it could be estimated that (2.0 ± 0.6) × 10⁶ carbon ions of this bunch will penetrate the spatially homogeneous region of the plasma under investigation in the planned experiment, i.e., three orders of magnitude more particles than in previous measurements at GSI with a temporal bunch width comparatively almost five times shorter. The measurement of the stopping power of dense, highly ionized plasmas with the beam parameters achieved in this work should therefore lead to much lower measurement uncertainties than in the experiments performed so far. |
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Alternatives oder übersetztes Abstract: |
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Status: | Verlagsversion | ||||
URN: | urn:nbn:de:tuda-tuprints-243956 | ||||
Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 500 Naturwissenschaften und Mathematik > 530 Physik | ||||
Fachbereich(e)/-gebiet(e): | 05 Fachbereich Physik 05 Fachbereich Physik > Institut für Kernphysik |
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Hinterlegungsdatum: | 09 Aug 2023 11:05 | ||||
Letzte Änderung: | 10 Aug 2023 07:10 | ||||
PPN: | |||||
Referenten: | Roth, Prof. Dr. Markus ; Bagnoud, Prof. Dr. Vincent | ||||
Datum der mündlichen Prüfung / Verteidigung / mdl. Prüfung: | 15 Februar 2023 | ||||
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