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Relativistically Intense Laser–Microplasma Interactions
Af: Tobias Ostermayr Engelsk Paperback
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kr 253
Relativistically Intense Laser–Microplasma Interactions
Af: Tobias Ostermayr Engelsk Paperback
This dissertation covers several important aspects of relativistically intense laser-microplasma interactions and some potential applications. A Paul-trap based target system was developed to provide fully isolated, well defined and well positioned micro-sphere-targets for experiments with focused peta-watt laser pulses. The laser interaction turned such targets into microplasmas, emitting proton beams with kinetic energies exceeding 10 MeV. The proton beam kinetic energy spectrum and spatial distribution were tuned by variation of the acceleration mechanism, reaching from broadly distributed spectra in relatively cold plasma expansions to spectra with relative energy spread as small as 20% in spherical multi-species Coulomb explosions and in directed acceleration processes. Numerical simulations and analytical calculations support these experimental findings and show how microplasmas may be used to engineer laser-driven proton sources.
 
In a second effort, tungsten micro-needle-targets were used at a peta-watt laser to produce few-keV x-rays and 10-MeV-level proton beams simultaneously, both measured to have only few-µm effective source-size. This source was used to demonstrate single-shot simultaneous radiographic imaging with x-rays and protons of biological and technological samples. 

Finally, the dissertation discusses future perspectives and directions for laser-microplasma interactions including non-spherical target shapes, as well as thoughts on experimental techniques and advanced quantitative image evaluation for the laser driven radiography.

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This dissertation covers several important aspects of relativistically intense laser-microplasma interactions and some potential applications. A Paul-trap based target system was developed to provide fully isolated, well defined and well positioned micro-sphere-targets for experiments with focused peta-watt laser pulses. The laser interaction turned such targets into microplasmas, emitting proton beams with kinetic energies exceeding 10 MeV. The proton beam kinetic energy spectrum and spatial distribution were tuned by variation of the acceleration mechanism, reaching from broadly distributed spectra in relatively cold plasma expansions to spectra with relative energy spread as small as 20% in spherical multi-species Coulomb explosions and in directed acceleration processes. Numerical simulations and analytical calculations support these experimental findings and show how microplasmas may be used to engineer laser-driven proton sources.
 
In a second effort, tungsten micro-needle-targets were used at a peta-watt laser to produce few-keV x-rays and 10-MeV-level proton beams simultaneously, both measured to have only few-µm effective source-size. This source was used to demonstrate single-shot simultaneous radiographic imaging with x-rays and protons of biological and technological samples. 

Finally, the dissertation discusses future perspectives and directions for laser-microplasma interactions including non-spherical target shapes, as well as thoughts on experimental techniques and advanced quantitative image evaluation for the laser driven radiography.

Produktdetaljer
Sprog: Engelsk
Sider: 166
ISBN-13: 9783030222109
Indbinding: Paperback
Udgave:
ISBN-10: 3030222101
Kategori: Plasmafysik
Udg. Dato: 14 aug 2020
Længde: 0mm
Bredde: 235mm
Højde: 155mm
Oplagsdato: 14 aug 2020
Forfatter(e): Tobias Ostermayr
Forfatter(e) Tobias Ostermayr


Kategori Plasmafysik


Sprog Engelsk


Indbinding Paperback


Sider 166


Udgave


Længde 0mm


Bredde 235mm


Højde 155mm

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