Ding, Johannes (2018)
Generation, Handling and Transport of Laser-Driven Heavy Ion Beams.
Technische Universität Darmstadt
Dissertation, Erstveröffentlichung
Kurzbeschreibung (Abstract)
The thesis at hand addresses the generation, handling and transport of laser-driven heavy ion beams. The presented research has been conducted within the laser and plasma physics group at the institute of nuclear physics of the Technical University of Darmstadt. The experimental campaigns contributing to the results in this thesis have been carried out at the GSI Helmholtz Center for Heavy Ion Research and were supported by their plasma physics department.
The laser-driven ion acceleration scheme target normal sheath acceleration (TNSA) enables the compact generation of intense ion bunches with kinetic energies in the range of 10s of MeV. The laser-accelerated ion beams have unique properties, such as extremely small transverse and longitudinal emittance, high numbers of ions per bunch, but also broad exponentially decaying energy spectra and high divergence. Due to the nature of the acceleration process the composition of ion species in the beam is defined by the atom population in the source area and is generally dominated by protons stemming from ever present hydro-carbon contaminations. Many anticipated applications of laser-driven ion beams rely on the efficient acceleration of heavy ions and on controlling the energy spread and the divergence of the initial TNSA beam.
In this work the efficient acceleration of carbon and fluorine ion beams by means of TNSA was demonstrated. The hydrocarbon contaminations on the surface of the coated targets were removed by means of Joule heating. Utilizing this method and the 100 TW beamline of the PHELIX laser system at GSI, kinetic energies of fourfold positively charged carbon ions C4+ of up to 68.5 MeV and of sevenfold positively charged fluorine ions F7+ of up to 180 MeV were observed.
With the help of a pulsed high-field solenoid magnet from Helmholtz Center Dresden-Rossen- dorf incorporated into the prototype beamline of the LIGHT (Laser Ion Generation, Handling and Transport) collaboration, the efficient collimation and transport as well as the energy selection by means of chromatic focussing of the laser-driven carbon and fluorine ion beams could be achieved. At an average energy of 14.9 MeV a number of 0.99 billion C4+ ions were detected at a distance from the ion source of more than 6.0 m by a combination of radiochromic films and Thomson parabolas.
Challenging problems for the temporal bunch compression of laser-driven heavy ion beams with a three gap spiral resonator as well as viable solutions to these hurdles have been identified and already incorporated into the LIGHT beamline within the scope of this thesis. A first successful proof-of-principle of temporal bunch compression of laser-driven fluorine ion beams resulted in bunches as short as 1.3 ns (FWHM).
By successfully demonstrating the efficient generation, handling and transport of laser-driven heavy ion beams an anticipated laser-driven ion beamline for the investigation of for example the stopping power of ions in dense plasmas is within reach.
Typ des Eintrags: | Dissertation | ||||
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Erschienen: | 2018 | ||||
Autor(en): | Ding, Johannes | ||||
Art des Eintrags: | Erstveröffentlichung | ||||
Titel: | Generation, Handling and Transport of Laser-Driven Heavy Ion Beams | ||||
Sprache: | Englisch | ||||
Referenten: | Roth, Prof. Dr. Markus ; Boine-Frankenheim, Prof. Dr. Oliver | ||||
Publikationsjahr: | 2018 | ||||
Ort: | Darmstadt | ||||
Datum der mündlichen Prüfung: | 29 Oktober 2018 | ||||
URL / URN: | https://tuprints.ulb.tu-darmstadt.de/8214 | ||||
Kurzbeschreibung (Abstract): | The thesis at hand addresses the generation, handling and transport of laser-driven heavy ion beams. The presented research has been conducted within the laser and plasma physics group at the institute of nuclear physics of the Technical University of Darmstadt. The experimental campaigns contributing to the results in this thesis have been carried out at the GSI Helmholtz Center for Heavy Ion Research and were supported by their plasma physics department. The laser-driven ion acceleration scheme target normal sheath acceleration (TNSA) enables the compact generation of intense ion bunches with kinetic energies in the range of 10s of MeV. The laser-accelerated ion beams have unique properties, such as extremely small transverse and longitudinal emittance, high numbers of ions per bunch, but also broad exponentially decaying energy spectra and high divergence. Due to the nature of the acceleration process the composition of ion species in the beam is defined by the atom population in the source area and is generally dominated by protons stemming from ever present hydro-carbon contaminations. Many anticipated applications of laser-driven ion beams rely on the efficient acceleration of heavy ions and on controlling the energy spread and the divergence of the initial TNSA beam. In this work the efficient acceleration of carbon and fluorine ion beams by means of TNSA was demonstrated. The hydrocarbon contaminations on the surface of the coated targets were removed by means of Joule heating. Utilizing this method and the 100 TW beamline of the PHELIX laser system at GSI, kinetic energies of fourfold positively charged carbon ions C4+ of up to 68.5 MeV and of sevenfold positively charged fluorine ions F7+ of up to 180 MeV were observed. With the help of a pulsed high-field solenoid magnet from Helmholtz Center Dresden-Rossen- dorf incorporated into the prototype beamline of the LIGHT (Laser Ion Generation, Handling and Transport) collaboration, the efficient collimation and transport as well as the energy selection by means of chromatic focussing of the laser-driven carbon and fluorine ion beams could be achieved. At an average energy of 14.9 MeV a number of 0.99 billion C4+ ions were detected at a distance from the ion source of more than 6.0 m by a combination of radiochromic films and Thomson parabolas. Challenging problems for the temporal bunch compression of laser-driven heavy ion beams with a three gap spiral resonator as well as viable solutions to these hurdles have been identified and already incorporated into the LIGHT beamline within the scope of this thesis. A first successful proof-of-principle of temporal bunch compression of laser-driven fluorine ion beams resulted in bunches as short as 1.3 ns (FWHM). By successfully demonstrating the efficient generation, handling and transport of laser-driven heavy ion beams an anticipated laser-driven ion beamline for the investigation of for example the stopping power of ions in dense plasmas is within reach. |
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URN: | urn:nbn:de:tuda-tuprints-82148 | ||||
Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 500 Naturwissenschaften und Mathematik > 530 Physik | ||||
Fachbereich(e)/-gebiet(e): | 05 Fachbereich Physik 05 Fachbereich Physik > Institut für Kernphysik 05 Fachbereich Physik > Institut für Kernphysik > Experimentelle Kernphysik 05 Fachbereich Physik > Institut für Kernphysik > Experimentelle Kernphysik > Laser- und Plasmaphysik |
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Hinterlegungsdatum: | 02 Dez 2018 20:55 | ||||
Letzte Änderung: | 02 Dez 2018 20:55 | ||||
PPN: | |||||
Referenten: | Roth, Prof. Dr. Markus ; Boine-Frankenheim, Prof. Dr. Oliver | ||||
Datum der mündlichen Prüfung / Verteidigung / mdl. Prüfung: | 29 Oktober 2018 | ||||
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