The Vicar of Wakefield is neither a sensational novel directed toward the reform of mankind nor does it mark an advance in fictional techniques. Rather, it is conventional both in form and substance. Despite this literary orthodoxy, the novel has remained popular with critics and the reading public for two centuries. Previous plot studies of The Vicar have concentrated principally on Goldsmithss failure to utilize adequately the cause-effect relationship. With few exceptions, all scholars who have studied this plot find coincidence and accidental meeting the novel's greatest weakness. Most character analyses of the narrative have centered on the chief character. While one critic attributes "typical human naturalness" to the Vicar, another finds him "an impossible mixture of folly and wisdom" and "an inadequate cog in a poorly designed machine.." In thematic studies of The Vicar, critics have attempted with little success to define the major theme. Those themes which have received most extensive treatment are the contrast of appearance and reality, the innate goodness of man, the limitations of contemporary literature, the corruption in government, and the ideal nature of rural life. A few stylistic studies of the novel have concentrated their praise on Goldsmith's spontaneity, some, contradictorily, on his careful diction, and others on his success in handling both humor and pathos.

Includes the actual sketch plan for Wakefield and vicinity. / Digitized by Kansas State University Libraries

Typescript (photocopy). / Digitized by Kansas Correctional Industries

We report the status of two-color high intensity laser-plasma interaction experiments on the UT³ laser system at the University of Texas at Austin. After an outline of the experimental apparatus, an overview of the motivating theoretical work, and a characterization of the performance of our Chirped Pulse Raman Amplification system (CPRA) we report the status of our most recent experiment. We have attempted to seed the growth of the Raman Forward Scattering (RFS) instability in order to produce electrons at lower driving pulse power than is conventionally needed. We have been unsuccessful, and provide reasons why and recommendations for future modifications to the experimental apparatus. The most significant conclusion is that the CPRA system as it is now is not appropriate for this experiment because the observed RFS spectrum is at higher wavelength than our system. Possible future changes include either amplifying a separate barium nitrate sideband at 938 nm through the CPRA system or using a different Raman active medium after the main 800 nm UT³ pulse is compressed. The feasibility study of these possible modifications is not yet complete. / text

Plasma-based accelerators aim to efficiently generate relativistic electrons by exciting plasma waves using a laser or particle beam driver, and "surfing" electrons on the resulting wakefields. In the blowout regime of such wakefield acceleration techniques, the intense laser radiation pressure or beam fields expel all of the plasma electrons transversely, forming a region completely devoid of electrons ("bubble") that co-propagates behind the driver. Injection, where initially quiescent background plasma electrons become trapped inside of the plasma bubble, can be caused by a variety of mechanisms such as bubble expansion, field ionization or collision between pump and injector pulses. This work will present a study of the injection phenomenon through analytic modeling and particle-in-cell (PIC) simulations. First, an idealized model of a slowly expanding spherical bubble propagating at relativistic speeds is used to demonstrate the importance of the bubble's structural dynamics in self-injection. This physical picture of injection is verified though a reduced PIC approach which makes possible the modeling of problem sizes intractable to first-principles codes. A more realistic analytic model which takes into account the effects of the detailed structure of the fields surrounding the bubble in the injection process is also derived. Bubble expansion rates sufficient to cause injection are characterized. A new mechanism for generation of quasi-monoenergetic electron beams through field ionization induced injection is presented, and simulation results are compared to recent experimental results. Finally, a technique for frequency-domain holographic imaging of the evolving bubble is analyzed using PIC as well as a novel simulation method for laser probe beam propagation. / text

Thesis (B.A. Hons.)--University of Adel., 1967. / [Typescript].

In this thesis electron generation is studied via laser plasma interaction known as laser wakefield acceleration in two regimes of weakly relativistic and highly relativistic laser intensity regimes. The plasma targets consisted of gas jets photonionized by rising edge of the laser pulse to densities as high as 10^20cm3. In the weakly relativistic regime, 210 mJ at 33 fs were focused to intensities of up to 310^18 Wcm2 on the gas targets of 2.4 mm length. In the highly relativistic regime, 3 J of energy compressed in 30 fs were delivered at intensity as high as 6.5 10^18 Wcm2 on targets of 2.4, 5, and 10 mm. Monoenergetic electrons in tens of MeV were observed in weakly relativistic regime, while electron energies as high as 300 MeV were observed in highly relativistic regime. Higher input laser intensity and prepulse levels were found to enhance electron production. Scaling of energy and stability of electron generation were also studied. / Photonics and Plasmas

No description available.

texte remanié de: Th.--Lettres--Paris, 1904. / Notes bibliogr. Bibliogr. p. 113-116.

Linear colliders are an option for lepton collision at several TeV. The Compact Linear Collider (CLIC) aims at electron and positron collisions at a centre of mass energy of 3 TeV. In CLIC, the main accelerating structures are designed to operate at an X-band frequency of 12 GHz with an accelerating gradient of 100 MV/m. Two significant issues in linear accelerators that can prevent high gradient being achieved are electrical breakdown and wakefields. The baseline design for the CLIC main linacs relies on a small aperture size to reduce the breakdown probability and a strong damping scheme to suppress the wakefields. The strong damping scheme may have a higher possibility of electrical breakdown. In this thesis an alternative design for the main accelerating structures of CLIC is studied and various aspects of this design are discussed. This design is known as a Damped and Detuned Structure (DDS) which relies on moderate damping and strong detuning of the higher order modes (HOMs). The broad idea of DDS is based upon the Next Linear Collider (NLC) design. The advantages of this design are: well damped wakefields, minimised rf breakdown probability and reduced size of the structure compared to the strong damping design. Procedures necessary to minimise the rf monopole fields and enhance the wakefield suppression are discussed. The rf as well as mechanical designs of a test structure are presented. This unique design forms the basis of this research and allows both the electrical breakdown and beam dynamics constraints to be simultaneously satisfied.