Jason cole | 4 key idea #1: replace accelerator material with a substance which cannot be broken down – plasma laser wakefield accelerators (lwfas) ionisation gas plasma. Improvement of laser-wakefield accelerators: towards a compact free electron laser plasma the three years that i spent working on this thesis were an edifying – and enjoyable – adventure 1one should not forget, however, that the overall size of a laser-wakefield accelerator is not only determined. High-gradient gas-jet targets for laser wakefield acceleration taw wolterink master of science thesis april 2011 university of twente faculty of science and technology laser physics and nonlinear optics graduation committee: prof dr k-j boller dr ing hmj bastiaens prof dr jl herek dr ir eta van der. F brandi et al, real-time monitoring via second-harmonic interferometry of a flow gas cell for laser wakefield acceleration, review of scientific instruments f sylla, ion acceleration from laser-plasma interaction in underdense to near- critical regime: wakefield effects and associated plasma structures, phd thesis, ecole. In this thesis, different solutions to improve thequality of the electron bunch are developed, both analytically and through the use of particle-in-cell (pic) simulations it is shown in particularthat laser-wakefield accelerator could be advantageously combinedwith innovative laser-plasma undulators, in order to produce. 2/κp then the particle-in-cell code osiris is used to simulate this plasma-beam interaction for a range of beam densities and beam lengths, and the amplitude of the resulting wake- field is found to closely agree with the predictions of the model finally a 2d cylindrical simulation of the untreated super proton synchrotron. Injection mechanisms in laser wakefield acceleration dissertation zur erlangung des akademischen grades doctor rerum naturalium (dr rer nat) im fach physik eingereicht an der mathematisch-naturwissenschaftlichen fakultät humboldt universität zu berlin von dipl-phys christian koschitzki präsident der.
2017-05-02dissertation doi: 1018452/17760 injection mechanisms in laser wakefield acceleration koschitzki, christian mathematisch- naturwissenschaftliche fakultät die beschleunigung von elektronen im wechselwirkungsbereich hochintensiver laserfelder mit einem plasma wird als mögliche alternative zu. Abstract this thesis deals with the temporal characterisation of electron bunches produced by a laser plasma accelerator in the so-called laser wakefield acceleration (lwfa) scheme, an ultra-short high-intensity laser pulse excites a plasma wave, which can sustain accelerating electric fields of several hundred gv/m, thus. Thesis submitted to the faculty of the university graduate school in partial fulfillment of the requirements for we model the phase-mixing self-injection of electrons into plasma-wakefield acceleration structures driven in a 14 laser driven “linear” electron wake in 2d cartesian space using particle trap- ping simulations. A scheme for electron self-injection in the laser wakefield acceleration is proposed in this scheme, the transverse wave breaking of the wakefield and the tightly focused geometry of the laser beam play important roles a large number of the background electrons are self-injected into the acceleration phase of the wakefield.
Hollow channel plasma wakefield accelerator a dissertation submitted to the department of physics and the committee on charge for the laser navid vafaei-najafabadi led the way, undeterred by heat exhaustion or lack-of-sleep ken marsh brought some levity to the work. Electron accelerators, with the goal of reducing the energy of the drive laser pulse and enabling higher repetition rate finally, a laser wakefield accelerator at very high plasma density is studied, enabling relativistic electron beam dissertation submitted to the faculty of the graduate school of the university of maryland. Ever since beams of charged particles have been technologically realized towards the end of the 19th century, they have led to many great discoveries in fundamental physics the most recent being the discovery of the higgs boson at cern (cf eg ) as the studied phenomena progressed to smaller and smaller scales.
University-level laboratories this thesis considers relativistic short pulse laser- plasma interactions and important single ultrashort laser pulse the condition for the most efficient wakefield excitation (optimum energy the first topic of this thesis is the study of particle acceleration mechanisms in laser plasma interaction. Plasma channel guided laser wakefield accelerator by cameron guy robinson geddes ba (swarthmore college) 1997 ma (university of california, berkeley) 2003 a dissertation submitted in partial satisfaction of the requirements for the degree of doctor of philosophy in physics in the graduate division of the. In laser wakefield acceleration (lwfa) a high intensity laser pulse is used to excite a plasma density wave with an associated electric field this electric field can be used to accelerate electrons however, to be accelerated the electrons first of all need to enter the plasma wave this process is called injection in this thesis a. This thesis presents a simulation campaign that demonstrates for laser wakefield acceleration (lwfa) wakefield the perturbed plasma electrons form a wakefield that co-propagates with the driving beam an electron between an electron region and ion region will experience a strong longitudinal.
This thesis describes the development and first application of a novel diagnostic for a laser driven wakefield accelerator it is termed few‐cycle microscopy (fcm) and consists of a high-resolution imaging system and probe pulses with a duration of a few optical cycles synchronized to a high intensity laser. In an experiment at the jeti-laser system, the electron density in the plasma has been probed and simultaneously, the electron energy has been measured on this basis, the ideal parameters for laser wakefield acceleration could be determined the present thesis is focused on setup, characterization and application of the. Ion acceleration from laser-plasma interaction in underdense to near-critical regime: wakefield effects and near-critical regime : wakefield effects and associated plasma structures soutenue publiquement le 05 5 conclusion & perspectives 127 51 synopsis of the results obtained in thesis. Found in the first part of the thesis where the basics of laser-wakefield acceleration are discussed in detail i3 methods for x-ray generation while some projects aim at an electron-positron collider based on laser-wakefield accel - eration (similar to the planned ilc ), the more near-term application of this principle.
A dissertation submitted in partial satisfaction of the requirements for the 13 2 review of plasma-based accelerator physics 14 21 single particle dynamics in a wakefield 14 22 laser beams (pwfa) b) laser wakefield accelerator (lwfa) c) plasma beatwave accelerator. External injection of electron bunches into laser-driven plasma wakefields at regae dissertation zur erlangung des doktorgrades an der fakultät für mathematik, informatik und naturwissenschaften abstract laser wakefield acceleration (lwfa) has the potential to become the next-generation acceleration technique. This thesis covers the few-cycle laser-driven acceleration of electrons in a laser- generated plasma this process, known as laser wakefield acceleration (lwfa), relies on strongly driven plasma waves for the generation of accelerating gradients in the vicinity of several 100 gv/m, a value four.
Laser-wakefield accelerators are compact devices capable of delivering ultra- short electron bunches with pc-level charge and mev-gev energy by exploiting the ultra-high electric fields arising from the interaction of intense laser pulses with plasma we show experimentally and through numerical. In this dissertation, the direct laser acceleration (dla) of ionization-injected electrons in a laser wakefield accelerator (lwfa) operating in the quasi-blowout regime has been investigated through experiment and simulation in the blowout regime of lwfa, the radiation pressure of an intense laser pulse can. The resulting plasma wave that is called laser wakefield supports high electric fields, and electrons can be accelerated to high energies in these fields within a very short length the advantage of a laser wakefield accelerator is that plasmas support much higher electric fields compared to conventional accelerators.