Thesis (M.S. in Applied Physics)--Naval Postgraduate School, June 2010. / Thesis Advisor(s): Lewellen, John ; Swent, Richard. "June 2010." Description based on title screen as viewed on July 13, 2010. Author(s) subject terms: Free Electron Lasers, Field Emitter Arrays, Cathode Test Cell, FEL, Diamond Field Emitter Array, Cathode. Includes bibliographical references (p. 71-72). Also available in print.

Thesis (M.S. in Applied Physics)--Naval Postgraduate School, June 2005. / Thesis Advisor(s): William Colson. Includes bibliographical references (p. 97-98). Also available online.

Thesis (M.S. in Applied Physics)--Naval Postgraduate School, June 2007. / Thesis Advisor(s): William B. Colson. "June 2007." Includes bibliographical references (p. 53-54). Also available in print.

Thesis (Ph. D.)--University of Missouri-Columbia, 2000. / Typescript. Vita. Includes bibliographical references. Also available on the Internet.

La spectroscopie infrarouge permet d’identifier la structure 3D de systèmes moléculaires, par comparaison des spectres mesurés et simulés. Nous travaillons en phase gazeuse, où les molécules et clusters sont libres d’interactions intermoléculaires. Notre travail combine les expériences IR-UV ion-dip et le calcul de spectres IR anharmoniques par la méthode DFT-MD. Le spectre IR est calculé pour les structures 3D de plus basses énergies,le meilleur accord donnant la connaissance de la structure présente dans les conditions expérimentales.Nous démontrons que le domaine de l’IR lointain/THz (<800 cm-1, <24 THz) permet d’identifier sans ambiguïté la structure 3D de molécules et clusters en phase gazeuse, là ou les signatures du domaine 1000-4000 cm-1 peuvent être limitées. Les systèmes considérés sont des dipeptides, un modèle de feuillet β, dérivés du phénol (et complexés à l’eau) des paires de bases de l’ADN, dont les structures sont bâties sur des liaisons hydrogène intra/intermoléculaires. / Infrared spectroscopy allows the assignment of three dimensional structures of molecular systems, by comparing experimental and theoretical spectra. Our investigations take place in the gas phase, where molecules and clusters are free of intermolecular interactions.Our work combines experimental IR-UV ion dip spectroscopy and theoretical DFT-MD anharmonic spectroscopy. The infrared spectrum is calculated for low energy 3Dstructures and the best match between theory and experiment provides the information about the structure present in the experimental conditions.We demonstrate for several systems that far infrared/THz spectroscopy (<800 cm-1, <24THz) allows conformational assignment without ambiguities, contrary to the more traditional 1000-4000 cm-1 range. Systems investigated here are dipeptides, a β-sheet model, phenol derivatives (also complexe dwith water molecules), DNA base pairs, all these structures being built on intra-/intermolecular hydrogen bonds.

The free electron laser (FEL) is proposed to meet the Navy's need for a speed-of-light high energy laser weapon capable of engaging a variety of targets including anti-ship cruise missiles, small boats, and theater ballistic missiles. A key attribute of FELs is good optical beam quality; in other words, they operate in only a few of the lowest-order transverse Gaussian modes. For weapons applications, a good mode quality is desired because it delivers the highest intensity on target ensuring a high level of lethality. A few higher-order modes can arise from the interaction of the electron beam with the optical beam, or from misalignments of the electron beam or resonator mirrors. High intensity on FEL optics can lead to mirror distortion due to heating and insufficient cooling of the mirror substrate. Mirror distortions, including astigmatism, can cause higher-order modes to appear affecting FEL performance. Therefore, it is important to quantify these higher-order modes because doing so uniquely identifies the optical field and may allow for corrective optics to single out the best modes for FEL lethality. This thesis will review free electron laser theory, and for the first time develop analytical solutions to quantify Hermite-Gaussian higher-order modes, develop a diagnostic for modal analysis, and determine the tolerance limits on mirror distortions.

The free electron laser (FEL) is among the latest technologies of interest to the U.S. military, in particular, the Navy. In naval applications, FEL laser would serve as a self-defense weapon system, protecting the ship from an array of threats including anti-surface cruise missiles and small boats. This system's potential range and deep magazine makes it ideal as point defense against incoming missiles. Its inexpensive cost of only a few dollars per engagement and multi-mission capability makes this future weapon system superior to the short-range missile-defense systems employed today. The most powerful FEL is currently located in Jefferson Lab, operating at 10 kW, two orders of magnitude short of the 1 MW power level required for weapons application. This thesis will describe the components and theory of operation of the FEL, as well as analyze two competing designs for the next step in the evolution of the future weapon system, the 100 kW FEL, proposed by Brookhaven and Los Alamos National Labs. Due to advances in NPS simulation techniques for the amplifier configuration, a more in depth analysis including the effects of electron beam tilt and shift is performed for the first time on these proposed designs.

Thesis (M.S. in Applied Physics and M.S. in Electrical Engineering)--Naval Postgraduate School, December 2002. / Thesis advisor(s): William B. Colson, Phillip E. Pace. "AD-A411 177." Includes bibliographical references (p. 81-83). Also available online.

Thesis (M.S. in Applied Physics and M.S. in Electrical Engineering)--Naval Postgraduate School, December 2002. / Thesis advisor(s): William B. Colson, Phillip E. Pace. Includes bibliographical references (p. 81-83). Also available online.

Thesis (M.S. in Applied Physics and M.S. in Electrical Engineering)--Naval Postgraduate School, December 2002. / Thesis advisor(s): William B. Colson, Phillip E. Pace. Includes bibliographical references (p. 101-102). Also available online.