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This thesis is dealing with the acceleration of protons during the interaction of relativistic laser pulses with plasmas. The focus was directed on the measurement and the improvement of the properties of the proton beam and the enhancement of the conversion efficiency of the laser-pulse energy into kinetic energy of the protons. Here, the investigation of the generation of energetic protons from water micro-droplets identified the temporal intensity contrast of the laser pulse as one of the causes for the present limitation of the maximal obtainable particle energy. By controlling this property, an increase by a factor of 10 in the motional energy of the protons in comparison to earlier experiments could be achieved. Furthermore, the realisation of proton pulses at high repetition rate could be demonstrated by continuous generation of the water micro-droplets. Additionally, filaments of solid hydrogen for the production of proton beams with high-intensity lasers were investigated in detail in this thesis. Here, the evaporation of the hydrogen leads to the formation of a corona which in uences the acceleration mechanism. The plasma expansion of the filament is inducing a shock wave in the corona leading to a distinct modulation of the energy spectrum of the protons. Furthermore, it could be demonstrated that the conversion eciency of laser pulse energy into proton energy for a 10-TW-class laser is increased to a few percent which so far only could be shown with high-energy lasers, providing several 100's of Joule of pulse energy. The implementation of a process for the continuous monitoring of the proton-beam profile exhibited a dependency of the structures within the beam on the dimensionality of the target. The efficient generation of energetic proton beams at high repetition rate demonstrated in this thesis, is of great interest in the view of applications in the area of accelerator technology, material science and medical physics.
Buchkauf
Laser proton acceleration from water micro-droplets and solid hydrogen targets, Jens Polz
- Sprache
- Erscheinungsdatum
- 2017
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- Titel
- Laser proton acceleration from water micro-droplets and solid hydrogen targets
- Sprache
- Englisch
- Autor*innen
- Jens Polz
- Verlag
- mbv
- Erscheinungsdatum
- 2017
- ISBN10
- 3863878388
- ISBN13
- 9783863878382
- Reihe
- Physics
- Kategorie
- Physik
- Beschreibung
- This thesis is dealing with the acceleration of protons during the interaction of relativistic laser pulses with plasmas. The focus was directed on the measurement and the improvement of the properties of the proton beam and the enhancement of the conversion efficiency of the laser-pulse energy into kinetic energy of the protons. Here, the investigation of the generation of energetic protons from water micro-droplets identified the temporal intensity contrast of the laser pulse as one of the causes for the present limitation of the maximal obtainable particle energy. By controlling this property, an increase by a factor of 10 in the motional energy of the protons in comparison to earlier experiments could be achieved. Furthermore, the realisation of proton pulses at high repetition rate could be demonstrated by continuous generation of the water micro-droplets. Additionally, filaments of solid hydrogen for the production of proton beams with high-intensity lasers were investigated in detail in this thesis. Here, the evaporation of the hydrogen leads to the formation of a corona which in uences the acceleration mechanism. The plasma expansion of the filament is inducing a shock wave in the corona leading to a distinct modulation of the energy spectrum of the protons. Furthermore, it could be demonstrated that the conversion eciency of laser pulse energy into proton energy for a 10-TW-class laser is increased to a few percent which so far only could be shown with high-energy lasers, providing several 100's of Joule of pulse energy. The implementation of a process for the continuous monitoring of the proton-beam profile exhibited a dependency of the structures within the beam on the dimensionality of the target. The efficient generation of energetic proton beams at high repetition rate demonstrated in this thesis, is of great interest in the view of applications in the area of accelerator technology, material science and medical physics.