Titel: Laser-Driven Anti-Resonant Fibers: Acceleration and Phase Space Manipulation of Relativistic Electron Beams
Sprache: Englisch
Autor*in: Genovese, Luca
Erscheinungsdatum: 2022
Tag der mündlichen Prüfung: 2022-07-26
In this work of thesis, applications of photonic crystal fiber to advanced accelerator concepts are investigated. Due to the high damage threshold of dielectric material in the optical regime, dielectric laser accelerators can support $\mathcal{O}$(GV/m) as accelerating field which motivates to investigate laser-driven dielectric structures.

Laser-driven hollow core photonic bandgap (PBG) fibers were proposed by Lin in 2001 as high-gradient accelerators. The central defect in the transversely periodic lattice supports an accelerating mode which collinearly propagates with the ultra-relativistic electron beam for synchronous acceleration. The optical frequencies in such dielectric laser accelerators motivate a sensitivity and tolerance study to overcome manufacturing imperfections. Moreover, the defining a tolerance range in which the modes properties in the fiber can be recovered tuning the laser wavelength seems to be very useful for the manufacturing where a tolerance range of 10$\%$ is generally required. Finally, in this thesis, the propagation characteristics of Lin fibers are discussed and it is found that small-bandwidth ($\approx$ ns) pulses would be needed for efficient acceleration over longer distances.

However, the central core diameter is comparable to the driving wavelength which makes both the technical manufacturing of the fiber and its use with conventional charged beams challenging. In behalf of the collaboration established with Philipp Russell division at Max Planck Institute in Erlangen, more recent anti-resonant fibers (ARFs) were investigated.

In conventional beam manipulation techniques, the interaction between electron beams and laser is provided by magnetic undulators which unfortunately require a balance between the electron beam energy, undulator parameters and laser wavelength.
In this thesis we propose a novel scheme using laser-driven large-core anti-resonant optical fibers to manipulate electron beams. The accelerating TM$_{01}$ and the dipole HE$_{11}$ mode are investigated. In the former case, energy gain and large keV-level energy modulations can be achieved while maintaining the overall electron beam quality. Further, it is shown that with larger field strengths $\mathcal{O}$(100 MV/m) the resulting transverse forces can lead to the production of microbunch trains with a periodicity of the driving wavelength. Also, we investigate the application of the transverse dipole HE$_{11}$ mode and find it suitable to support time-domain electron beam diagnostics with sub-attosecond resolutions.

Finally, a preliminary test of the feasibility of this novel beam manipulation techniques has been performed. At ARES/SINBAD laser laboratory, an experimental optical setup was implemented to investigate the laser beam coupling efficiency and laser induced damage threshold of the end-face of the ARF.
URL: https://ediss.sub.uni-hamburg.de/handle/ediss/9859
URN: urn:nbn:de:gbv:18-ediss-103727
Dokumenttyp: Dissertation
Betreuer*in: Aßmann, Ralph
Hillert, Wolfgang
Enthalten in den Sammlungen:Elektronische Dissertationen und Habilitationen

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