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Academic literature on the topic 'Interferometry diagnostics'

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Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Interferometry diagnostics"

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Trolinger, James D., Amit Lal, Joshua Jo, and Stephen Kupiec. "Programmable Holographic Optical Elements as Adaptive Optics in Optical Diagnostics Devices." Key Engineering Materials 437 (May 2010): 108–12. http://dx.doi.org/10.4028/www.scientific.net/kem.437.108.

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This paper reports a combined, Hartmann/Digital Holographic interferometry inspection system for inspecting optical components that do not easily lend themselves to conventional interferometric or Hartmann inspection. A programmable holographic optical element (HOE) preconditions wavefronts to extend the dynamic range of interferometry measurements and also transforms the same system into a scanning Hartmann operation, which has lower resolution but higher dynamic range. Inspecting aspherical surfaces with existing interferometers requires special, computer generated holographic optical elements to transform the wavefront to within the dynamic range of the interferometer. The Hartmann measurement provides the information required to precondition a reference wave that avails the measurement process to the more precise phase shifting interferometry. The SLM offers yet other benefits including a method for minimizing the effects of speckle on the measurement. The paper provides example measurements, discusses the limitations, and suggests other potential applications.
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Drozd, Alexey, and Dmitriy Sergeev. "Design of a phasemeter for real-time measurements of the average plasma density with the microwave interferometer of the tokamak T-15MD." Review of Scientific Instruments 93, no. 6 (June 1, 2022): 063501. http://dx.doi.org/10.1063/5.0087847.

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Interferometry is one of the key diagnostics for fusion research. This diagnostic measures electron plasma density. Interferometers that work on an intermediate frequency are widespread nowadays. The phase shift between interferometer signals has to be measured. The use of a microwave interferometer on machines, such as a tokamak, leads to challenging requirements for the phasemeter operation. We present a method to provide real-time measurements of phase shifts with values much higher than 2[Formula: see text]. The phasemeter has been designed for the microwave interferometer of the T-15MD tokamak. It is based on microcircuits AD8302. Two signals with frequencies of 5 and 10 MHz are used as interferometer outputs. The phasemeter output will be used to create a feedback loop for the working gas injection into the tokamak chamber to control the plasma density. The phasemeter has been successfully tested. The typical phase error and non-linearity of the device are 1° and 5 × 10−4, respectively.
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Dugin, N., A. Antipenko, V. Bezrukovs, V. Gavrilenko, A. Dementjev, A. Lesins, M. Nechaeva, et al. "Radio Interferometric Research of Ionosphere by Signals of Space Satellites." Open Astronomy 22, no. 1 (March 1, 2013): 25–33. http://dx.doi.org/10.1515/astro-2017-0144.

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AbstractSince 2012, the Radiophysical Research Institute and the Lobachevsky State University at Nizhny Novgorod, Russia and the Ventspils International Radio Astronomy Centre at Irbene, Latvia are making radio interferometric experiments on study of ionosphere parameters in a quiet (natural) state of medium and research of artificial turbulence of the ionosphere, heated by the emission from the SURA facility. Remote diagnostics of the ionosphere is implemented using a method of radio sounding by signals of navigation satellites in combination with the Very Long Baseline Interferometry (VLBI) method. As a result of spectral and correlation analysis, interferometric responses of the two-element (RRI–UNN) and three-element (RRI–UNN–Irbene) interferometers were received by observations of 12 satellites of the navigation systems GLONASS and GPS. Here the first results are reported.
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Stoller, P. C., J. Carstensen, B. Galletti, C. B. Doiron, and A. Sokolov. "Optical Diagnostics of Switching Arcs Near Current-zero: Speckle Imaging and Interferometry." PLASMA PHYSICS AND TECHNOLOGY 4, no. 1 (2017): 44–47. http://dx.doi.org/10.14311/ppt.2017.1.44.

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Optical diagnostics can be used to obtain spatially resolved measurements of the density, temperature, conductivity, and electron density of circuit breaker arcs embedded in transonic flows; these can be used to validate the results of simulations, the accuracy of which can currently be assessed in only a limited way. We compare speckle imaging and an interferometric approach. Both use a pulsed nanosecond laser. The speckle imaging setup does not require a reference beam, but only yields information about the gradient of the refractive index. Its accuracy is sensitive to the alignment of the optical components. Interferometry directly yields high resolution images of the index of refraction, from which the density can be calculated using the Gladstone-Dale relation. By using two laser beams, interferometry provides spatially resolved information about the electron density. Such measurements are a significant step towards more accurate CFD models.
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Chizhov, P., V. Bukin, and S. Garnov. "Interferometry in Femtosecond Laser Plasma Diagnostics." Physics Procedia 71 (2015): 222–26. http://dx.doi.org/10.1016/j.phpro.2015.08.363.

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Hojo, H., and A. Mase. "Fabry-Pérot interferometry for microplasma diagnostics." Review of Scientific Instruments 77, no. 10 (October 2006): 10F329. http://dx.doi.org/10.1063/1.2351910.

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Cotton, W., G. Perrin, R. Millan-Gabet, O. Delaa, and B. Mennesson. "High Resolution Radio and IR Observations of AGB Stars." Proceedings of the International Astronomical Union 8, S287 (January 2012): 245–49. http://dx.doi.org/10.1017/s1743921312007041.

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AbstractAsymptotic Giant Branch Stars (AGB) are evolved, mass losing red giants with tenuous molecular envelopes which have been the subject of much recent study using infrared and radio interferometers. In oxygen rich stars, radio SiO masers form in the outer regions of the molecular envelopes and are powerful diagnostics of the extent of these envelopes. Spectroscopically resolved infrared interferometry helps constrain the extent of various species in the molecular layer. We made VLBA 7 mm SiO maser, Keck Interferometer near IR and VLTI/MIDI mid IR high resolution observations of the stars U Ari, W Cnc, RX Tau, RT Aql, S Ser and V Mon. This paper presents evidence that the SiO is depleted from the gas phase and speculate that it is frozen onto Al2O3 grains and that radiation pressure on these grains help drive the outflow.
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Spolladore, Luca, Ivan Wyss, Riccardo Rossi, and Pasquale Gaudio. "A Multiphysics Ray Optics Model for the Propagation of Electromagnetic Waves in Plasmas and the Design of Laser-Based Diagnostics in Nuclear Fusion Reactors." Applied Sciences 11, no. 1 (January 4, 2021): 434. http://dx.doi.org/10.3390/app11010434.

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Laser-based methods are widely used techniques for thermonuclear plasma diagnostics, since they can probe the internal of the plasma, being contactless and non-invasive. The interferometer, the polarimeter and Thomson scattering are the most widespread techniques, providing line-integral information of the electron density and the magnetic field (interferometer–polarimeter) and local information of the electron density and temperature (Thomson scattering). The design of the diagnostics is a fundamental step, which usually requires an iterative process to maximise the performances of the diagnostics and their durability. In the future reactors, such as ITER and DEMO, the working environment will be much challenging, due to the various electro-mechanical, thermal and nuclear loads which may affect the life of the components and degrade the performances of the diagnostics. This work aims to present the modelling of plasma interferometry, polarimetry and Thomson scattering applied to a ray optics code. The model, developed on the COMSOL Multiphysics software, can be easily interfaced with multiphysics problems, allowing the possibility to test the performances of the diagnostics in several conditions.
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Kubes, P., M. Paduch, S. Auluck, M. J. Sadowski, J. Cikhardt, D. Klir, J. Kravarik, et al. "Observation of filaments in mega-ampere dense plasma focus within pure deuterium by means of simultaneous schlieren and interferometry diagnostics." Physics of Plasmas 30, no. 1 (January 2023): 012710. http://dx.doi.org/10.1063/5.0124093.

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Fifteen-frames interferometric diagnostics at the PF-1000 facility was enhanced by adding four frames of the schlieren diagnostics and by splitting of four channels in the optical delay line. This setup enabled the visualization of gradients in the plasma density perpendicular to the direction of the diagnostic laser beam, and their relationship with larger structures visualized by using laser interferometry. The schlieren pictures showed filamentary structures of submillimeter 200–300 μm diameter in shots performed with pure deuterium filling. Filaments were observed in a thin (millimeter-thick) lateral-boundary layer, in lobules, and in internal fast transforming regions of the dense plasma column. Their high-density gradients and location in the regions of recorded (or inferred) currents indicated local concentrations of the magnetic field and current distribution. Millimeter- and submillimeter-size sources of fast charged particles, which were identified in the recorded ion pinhole pictures, have been conjectured to be a manifestation of high local concentrations of the magnetic energy.
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Buccellato, R., P. F. Cunningham, M. M. Michaelis, and A. Prause. "Comparative electron density measurements for the refractive fringe diagnostic and Nomarski interferometry." Laser and Particle Beams 10, no. 4 (December 1992): 697–706. http://dx.doi.org/10.1017/s0263034600004638.

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Massive carbon targets were irradiated with a pulsed ruby laser and the laser-produced plasma electron densities were simultaneously evaluated using Nomarski interferometry and the refractive fringe diagnostic. An agreement of half an order of magnitude between the two diagnostics was obtained.
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Dissertations / Theses on the topic "Interferometry diagnostics"

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Bishop, Alexis Ivan. "Spectrally selective holographic interferometry techniques for flow diagnostics /." [St. Lucia, Qld.], 2001. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16305.pdf.

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Austin, Dane R. "High-resolution interferometric diagnostics for ultrashort pulses." Thesis, University of Oxford, 2010. http://ora.ox.ac.uk/objects/uuid:03ff32ea-c82a-4a42-9c6b-11e42ddb1e67.

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I present several new methods for the characterisation of ultrashort pulses using interferometry. A generalisation of the concatenation algorithm for spectral shearing interferometry enables interferograms taken at multiple shears to be combined. This improves the precision of the reconstructed phase in the presence of detector noise, and enables the relative phase between disjoint spectral components to be obtained without decreasing the spectral resolution. The algorithm is applied to experimental data from two different implementations of spectral shearing interferometry for ultrashort optical pulses. In one, the shears are acquired sequentially, and in the other they are acquired simultaneously. I develop a form of spatio-temporal ultrashort pulse characterisation which performs both spatial and spectral shearing interferometry simultaneously. It requires a similar geometrical setup to common implementations of spectral phase interferometry for direct electric-field reconstruction, but provides complete amplitude and phase characterisation in time and one spatial dimension. I develop the theory of lateral shearing interferometry for spectrally resolved wavefront sensing of extended ultraviolet and soft x-ray pulses generated using high-harmonic generation. A comprehensive set of wavefront measurements of harmonics 13-25 in Krypton show good agreement with theory, validating the technique. I propose and numerically demonstrate quantum-path interferometry mediated by a weak control field for high harmonic generation. This is a general technique for measuring the amplitude and relative phases of each contributing quantum path. The control field perturbatively modulates the phase of each path. The differing sensitivity of each path to the parameters of the control field allows their contributions to be distinguished from one another.
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Lwin, Mark. "A novel velocity interferometer using polarisation multiplexing and an extended source." Thesis, Queensland University of Technology, 2002.

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Boniface, Claude. "Modélisation et diagnostics d'un propulseur à effet Hall pour satellites : configuration magnétique et nouveaux concepts." Toulouse 3, 2006. http://www.theses.fr/2006TOU30016.

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Le Propulseur à Effet Hall est un moteur sans grille, dans lequel un champ magnétique radial confine les électrons d'un plasma formé entre deux cylindres coaxiaux diélectriques. La chute de la conductivité électronique qui en résulte permet l'établissement d'un champ électrique axial pour extraire les ions. La relativement faible poussée (100 mN) et la forte impulsion spécifique (vitesse des ions éjectés de 20 km/s) rendent le propulseur bien adapté aux tâches de maintien sur orbite des satellites ou de petits transferts d'orbite. L'étude porte sur la modélisation des phénomènes physiques dans le propulseur associée à une étude expérimentale, plus limitée, et destinée à valider ou compléter les modèles. La modélisation est basée sur une description des phénomènes de transport des particules (électrons, ions, neutres) en champs électrique et magnétique croisés. Un modèle développé au CPAT a été complété et utilisé pour chercher les conditions optimales de fonctionnement, en particulier l'étude de la configuration magnétique des moteurs à Effet Hall existants. De plus, nous avons développé un modèle pour étudier de nouveaux concepts de moteurs à Effet Hall, en particulier un moteur à Effet Hall à Double Etage, dans lequel on cherche à contrôler séparément la génération du plasma et l'accélération des ions. La partie expérimentale a consisté à utiliser des techniques de diagnostics plasma (interférométrie de Fabry-Pérot) permettant de mesurer la distribution du champ électrique dans le système, résultant de la présence du plasma et des tensions appliquées aux électrodes. Les mesures ont été effectuées sur le moyen d'essai PIVOINE installé à Orléans. La confrontation systématique des résultats expérimentaux et de simulation a permis de mieux définir les possibilités et les limites du modèle et d'en améliorer ses capacités prédictives
Hall Effect Thrusters (HETs) are gridless ion engines where a magnetic field barrier is used to impede the electron motion toward the anode and generate a large electric field that provides collisionless ion acceleration. The thrust is about 100 mN and the specific impulse of HETs is in the range 1600-2000 s (i. E. The velocity of ejected xenon ions is on the order of 16-20 km/s). The thrust and the specific impulse of standard Single Stage HETs are well adapted to the missions of orbit correction and station keeping. The goal here is to model the physical phenomena occurring in such a thruster, and, in correlation with experimental studies, to validate and/or improve the assumptions of the model. The model describes the transport of the electrons, ions, and neutrals in crossed electric and magnetic fields. The model developed at CPAT was extended and used to identify conditions for optimal operation of the thruster, with particular attention to the influence of the magnetic field distribution on the thruster operation. In addition, we developed a model to study new thuster concepts such as a Double Stage Hall Effect Thruster, where ionization and acceleration are accomplished in two stages. The experimental study involved using specific plasma diagnostics (Fabry-Perot Interferometry) in order to measure the electric field distribution in the thruster. Measurements were made at the PIVOINE test facility in Orléans. Systematic comparisons between experimental results and simulations allowed us to define more clearly the limits of the model and to improve its predictive ability
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Kline, Loren A. "Microwave Interferometry Diagnostic Applications for Measurements of Explosives." DigitalCommons@CalPoly, 2017. https://digitalcommons.calpoly.edu/theses/1783.

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Microwave interferometry (MI) is a Doppler based diagnostic tool used to measure the detonation velocity of explosives, which has applications to explosive safety. The geometry used in existing MI experiments is cylindrical explosives pellets layered in a cylindrical case. It is of interest to Lawrence Livermore National Labs to measure additional geometries that may be overmoded, meaning that the geometries propagate higher-order transverse electromagnetic waves. The goal of my project is to measure and analyze the input reflection from a novel structure and to find a good frequency to use in an experiment using this structure. Two methods of determining a good frequency are applied to the phase of the input reflection. The first method is R2, used to measure the linearity of input reflection phase. The second is a zero-crossing method that measures how periodic the input reflection phase is. Frequencies with R2 values higher than .995 may be usable for an experiment in the novel structure.
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Kasten, Cale Phillip. "Two-Color interferometry as a fluctuation diagnostic on Alcator C-Mod." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/82457.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Nuclear Science and Engineering, 2013.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 139-147).
The two-color interferometer diagnostic on Alcator C-Mod has been upgraded to measure line-integrated electron density fluctuations for turbulence and transport studies. Heterodyne signals from ten vertical-viewing CO2 laser chords are demodulated relative to a local oscillator using high bandwidth analog in-phase/quadrature electronics, replacing lower bandwidth digital fringe counting electronics. The raw outputs of the high bandwidth electronics, which are proportional to the sine and cosine of the interferometric phase shift, are digitized at up to 10 MHz, which is sufficient for fluctuation analysis. Extraction of the measured phase from the sine and cosine signals is now performed entirely in software, providing the line-integrated electron density at high bandwidth. The interferometer design, calibration, and measurement uncertainty is presented. Measurement uncertainties due to nonlinearities in the analog electronics are found to be comparable to the uncertainties of the previous system. The interferometer can now resolve line-integrated electron density fluctuations with major-radial wavenumbers below ... . The new fluctuation measurement capability is used to partially verify the calibration and low-kR wavenumber response of phase-contrast imaging, to aid in gyrokinetic transport model validation research. Agreement between the two diagnostics is demonstrated for broadband fluctuations and the low-kR component of the quasi-coherent mode, improving confidence in the calibration of the phase-contrast imaging system. Both diagnostics observe a series of fluctuations during quasi-steady periods of minority heated I-mode plasmas with strong off-axis electron heating. The observed fluctuations are localized to the plasma core using Doppler shift analysis and data from edge fluctuation diagnostics. Transport analysis shows that the fluctuations do not correlate with enhanced thermal transport, and gyrokinetic linear stability analysis shows that the plasma is stable to drift wave turbulence, ruling out the possibility that the observed fluctuations are destabilized drift wave turbulence.
by Cale Phillip Kasten.
S.M.
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Lee, Julian 1966. "Development of a broadband microwave interferometer for diagnostic measurements of detonations." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61307.

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In the present study, the microwave interferogram is digitized and analyzed using computer software developed to facilitate the extraction of velocity information from the microwave Doppler interference signals by applying digital signal processing techniques.
The waveguide or detonation tube of the present microwave interferometer consisted of a copper tube 38.4 mm in diameter, 3.5 m long, with a thin wire stretched along the center axis acting as a center conductor for the coaxial configuration. The system was tested at microwave frequencies of 6.70GHz and 9.21GHz by performing a number of detonation experiments in explosive gaseous mixtures of C$ sb2$H$ sb2$ + 2.5O$ sb2$ and C$ sb3$H$ sb8$ + 5O$ sb2$, at low initial pressures (6torr to 80torr). Average velocity measurements obtained by the microwave method generally agreed with independent photodetector measurements to within 2%.
In this study, the present technique has been used to explore unstable detonations near the limit. This demonstrates that the improved microwave Doppler interferometer is particularly well suited for unstable detonations where the large scale velocity fluctuations must be monitored continuously. It may be concluded that the present coaxial configuration microwave Doppler interferometry technique shows promise as a useful diagnostic tool for studying unstable detonations. (Abstract shortened by UMI.)
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Reddington, Alexander P. "Instrument design and optimization of interferometric reflectance imaging sensors for in vitro diagnostics." Thesis, Boston University, 2014. https://hdl.handle.net/2144/11031.

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Thesis (Ph.D.)--Boston University
In the field of drug discovery and disease diagnostics, protein microarrays have generated much enthusiasm for their high-throughput monitoring of biomarkers; however, this technology has yet to translate from research laboratories to commercialization. The hindrance is the considerable uncertainty and skepticism regarding data obtained. The disparity in results from different laboratories performing identical tests is attributed to a lack of assay quality control. Unlike DNA microarrays, protein microarrays have a higher level of bioreceptor immobilization variability and non-specific binding because of the more complex molecular structure and broader physiochemical properties. Traditional assay detection modalities, such as fluorescence microscopy and surface plasmon resonance, are unable to overcome both of these sources of variation. This dissertation describes the hardware and software design and biological validation of three complementary platforms that overcome bioreceptor variability and non-specific binding for diagnostics. In order to quantify the bioreceptor quality, a label-free, nondestructive, low cost, and high-throughput interferometric sensor has been developed as a quality control tool. The quality control tool was combined with a wide-field fluorescence imaging system to improve fluorescence experimental repeatability. Lastly, a novel high-throughput and label-free platform for quality control and specific protein microarray detection is described. This platform overcomes the additional complexities and time required with labeled assays by discriminating between specific and nonspecific detection by including sizing of individual binding events. Protein microarrays may one day emerge as routine clinical laboratory tests; however, it is important that the proper quality control procedures are in place to minimize erroneous results. These platforms provide reliable and repeatable protein microarray measurements for new advancements in disease diagnostics with the potential for drug discovery.
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Trad, Georges. "Développement et optimisation des diagnostiques des faisceaux du LHC et du SPS basé sur le suivi de la lumière synchrotron." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GRENY005/document.

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La mesure de l’émittance transverse du faisceau est fondamentale pour tous les accélérateurs, et en particulier pour les collisionneurs, son évaluation precise étant essentielle pour maximiser la luminosité et ainsi la performance des faisceaux de collision.Le rayonnement synchrotron (SR) est un outil polyvalent pour le diagnostic non-destructif de faisceau, exploité au CERN pour mesurer la taille des faisceaux de protons des deux machines du complexe dont l’énergie est la plus élevée, le SPS et le LHC où l’intensité du faisceau ne permet plus les techniques invasives.Le travail de thèse documenté dans ce rapport s’est concentré sur la conception, le développement, la caractérisation et l’optimisation des moniteurs de taille de faisceau basés sur le SR. Cette étude est fondée sur un ensemble de calculs théoriques, de simulation numériques et d’expériences conduite au sein des laboratoires et accélérateurs du CERN. Un outil de simulation puissant a été développé, combinant des logiciels classiques de simulation de SR et de propagation optique, permettant ainsi la caractérisation complète d’un moniteur SR de la source jusqu’au détecteur.La source SR a pu être entièrement caractérisée par cette technique, puis les résultats validés par observation directe et par la calibration à basse énergie basée sur les mesures effectuées avec les wire-scanners (WS), qui sont la référence en terme de mesure de taille de faisceau, ou telles que la comparaison directe avec la taille des faisceaux obtenue par déconvolution de la luminosité instantanée du LHC.Avec l’augmentation de l’énergie dans le LHC (7TeV), le faisceau verra sa taille diminuer jusqu’à atteindre la limite de la technique d’imagerie du SR. Ainsi, plusieurs solutions ont été investiguées afin d’améliorer la performance du système: la sélection d’une des deux polarisations du SR, la réduction des effets liés à la profondeur de champ par l’utilisation de fentes optiques et l’utilisation d’une longueur d’onde réduite à 250 nm.En parallèle à l’effort de réduction de la diffraction optique, le miroir d’extraction du SR qui s’était avéré être la source principale des aberrations du système a été entièrement reconçu. En effet, la détérioration du miroir a été causée par son couplage EM avec les champs du faisceau, ce qui a conduit à une surchauffe du coating et à sa dégradation. Une nouvelle géométrie de miroir et de son support permettant une douce transition en termes de couplage d’impédance longitudinale dans le beam pipe a été définie et caractérisée par la technique dite du “streched wire”. Egalement, comme méthode alternative à l’imagerie directe, un nouveau moniteur basé sur la technique d’interférométrie à deux fentes du SR, non limité par la diffraction, a également été développé. Le principe de cette méthode est basé sur la relation directe entre la visibilité des franges d’interférence et la taille de faisceau.Comme l’emittance du faisceau est la donnée d’intérêt pour la performance du LHC, il est aussi important de caractériser avec précision l’optique du LHC à la source du SR. Dans ce but, la méthode “K-modulation” a été utilisée pour la première fois au LHC en IR4. Les β ont été mesurés à l’emplacement de tous les quadrupoles et ont été évalués via deux algorithmes de propagation différents au BSRT et au WS
Measuring the beam transverse emittance is fundamental in every accelerator, in particular for colliders, where its precise determination is essential to maximize the luminosity and thus the performance of the colliding beams. Synchrotron Radiation (SR) is a versatile tool for non-destructive beam diagnostics, since its characteristics are closely related to those of the source beam. At CERN, being the only available diagnostics at high beam intensity and energy, SR monitors are exploited as the proton beam size monitor of the two higher energy machines, the Super Proton Synchrotron (SPS) and the Large Hadron Collider (LHC). The thesis work documented in this report focused on the design, development, characterization and optimization of these beam size monitors. Such studies were based on a comprehensive set of theoretical calculations, numerical simulations and experiments.A powerful simulation tool has been developed combining conventional softwares for SR simulation and optics design, thus allowing the description of an SR monitor from its source up to the detector. The simulations were confirmed by direct observations, and a detailed performance studies of the operational SR imaging monitor in the LHC, where different techniques for experimentally validating the system were applied, such as cross-calibrations with the wire scanners at low intensity (that are considered as a reference) and direct comparison with beam sizes de-convoluted from the LHC luminosity measurements.In 2015, the beam sizes to be measured with the further increase of the LHC beam energy to 7 TeV will decrease down to ∼190 μm. In these conditions, the SR imaging technique was found at its limits of applicability since the error on the beam size determination is proportional to the ratio of the system resolution and the measured beam size. Therefore, various solutions were probed to improve the system’s performance such as the choice of one light polarization, the reduction of depth of field effect and the reduction of the imaging wavelength down to 250 nm.In parallel to reducing the diffraction contribution to the resolution broadening, the extraction mirror, found as the main sources of aberrations in the system was redesigned. Its failure was caused by the EM coupling with the beam’s fields that led to overheating and deterioration of the coating. A new system’s geometry featuring a smoother transition in the beam pipe was qualified in terms of longitudinal coupling impedance via the stretched wire technique. A comparison with the older system was carried out and resulted in a reduction of the total power dissipated in the extraction system by at least a factor of four.A new, non-diffraction limited, SR-based monitor based on double slit interferometry was designed as well as an alternative method to the direct imaging. Its principle is based on the direct relation between the interferogram fringes visibility and the beam size.Since the beam emittance is the physical quantity of interest in the performance analysis of the LHC, determining the optical functions at the SR monitors is as relevant as measuring the beam size. The “K-modulation” method for the optical function determination was applied for the first time in the LHC IR4, where most of the profile monitors sit. The βs at the quadrupoles were measured and via two different propagation algorithms the βs at the BSRT and the WS were obtained reducing significantly the uncertainty at the monitors location
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Nikitine, Dmitri. "Optical and X-Ray Diagnostics of the Formation of Laser-Induced Plasmas in Gases and Vacuum." Doctoral thesis, Universitätsbibliothek Chemnitz, 2004. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200401345.

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Die Wechselwirkung intensiver Laserstrahlung mit Festkörperoberflächen ruft oberhalb einer bestimmten Leistungsdichte eine Materialablation hervor und führt schließlich zur Herausbildung sogenannter laserinduzierter Plasmen. In diesem Zusammenhang wird in der Literatur über nichtlinear-optische Phänomene wie Selbstfokussierung und -Kanalisierung der Laserstrahlung, sowie Ausbildung beschleunigter Plasmafragmente berichtet. Gegenstand der vorliegenden Arbeit ist die Untersuchung der Form und der Dynamik solcher laserinduzierten Plasmen an verschiedenen metallischen Targets (Al, Cu, W, Ta) in verschiedenen Umgebungen (Luft, Vakuum, Argon) unter besonderer Berücksichtigung der Vor-pulskonfigurationen des Laserstrahles. Es ist festzustellen, daß sich nach der Einwirkung eines Vorpulses der Energie 10¹²...10¹³ W/cm² auf das metallische Target in Luft und Argon eine Stoßwelle ausbildet, die im Falle von Luft zu einem Plasmakanal der Elektronendichte um 10²º 1/cm³, im Falle von Argon zu mehreren pulsierenden Kanälen führt. In der Arbeitsregime des Lasers mit einigen Vorpulsen wird in Luft und Argon die Herausbildung einer entsprechenden Anzahl von Stoßwellen im Plasma beobachtet. Als Ergebnis der Einwirkung des nachfolgenden Hauptpulses auf die entstandene Stoßwellenstruktur formiert sich ein Plasmakanal. Infolge der komplexen hydrodynamischen Wechselwirkung zwischen dem Hauptpuls und den Stoßwellen, sowie der Einwirkung starker Magnetfelder, erfolgt ein Auswurf von Plasmafragmenten entgegengesetzt dem Vektor der einfallenden Laserstrahlung. Die Fragestellung nach Abhängigkeit der Anzahl der Plasmafragmente von der Anzahl der Stoßwellen und der Pulsenergie des Lasers wird in dieser Arbeit verfolgt. Im Vakuum rufen die Vorpulse dagegen lediglich eine flache Plasmawolke hervor, in der sich als Ergebnis der Einwirkung des Hauptlaserimpulses wiederum eine Stoßwelle bildet. Weiter wird die Herausbildung von Plasmakanälen beobachtet, die in einem stumpfen Winkel zum Vektor des einfallenden Laserausstrahles geneigt sind. Mittels röntgenspektroskopischer Untersuchungen werden für die Plasmakanäle Elektronentemperaturen bis zu 2.7 keV ermittelt, was als Nachweis einer Vorbedingung zur Schaffung eines Röntgenlasers auf der Basis der vorliegenden Effekte gelten kann.
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Books on the topic "Interferometry diagnostics"

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J, Panda, Elam Kristie A, and NASA Glenn Research Center, eds. Rayleigh scattering diagnostic for dynamic measurement of velocity fluctuations in high speed jets. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 2001.

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Retinal Angiography and Optical Coherence Tomography. Springer, 2008.

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Book chapters on the topic "Interferometry diagnostics"

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Allen, G. R., H. P. Davis, L. P. Mix, and J. Chang. "Sub-Nanosecond, Four-Frame, Holographic Interferometry Diagnostics." In Fast Electrical and Optical Measurements, 729–41. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-017-0445-8_25.

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Ursu, I., D. Apostol, M. Stoica, I. Apostol, D. Craciun, A. Hening, I. N. Mihailescu, and V. Stancalie. "Laser Interferometry at 10.6 μm for Plasma Diagnostics." In Trends in Quantum Electronics, 443–62. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-662-10624-2_28.

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Spring, W. Charles, William J. Yanta, Kimberly Gross, and Carlos A. Lopez. "The Use of Holographic Interferometry for Flow Field Diagnostics." In New Trends in Instrumentation for Hypersonic Research, 97–112. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1828-6_9.

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Snider, R. T., T. N. Carlstrom, C. H. Ma, and W. A. Peebles. "Application of Interferometry and Faraday Rotation Techniques for Density Measurements on ITER." In Diagnostics for Experimental Thermonuclear Fusion Reactors, 225–33. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-0369-5_27.

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Yonemura, M., and Y. Yamamoto. "Combustion Diagnostics by Electronic Speckle Pattern Interferometry Using a CCD Image Sensor." In Laser Diagnostics and Modeling of Combustion, 181–86. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-45635-0_23.

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Hergott, J. F. "XUV Interferometry Using High Order Harmonics: Application to Plasma Diagnostics." In Atoms, Solids, and Plasmas in Super-Intense Laser Fields, 401–6. Boston, MA: Springer US, 2001. http://dx.doi.org/10.1007/978-1-4615-1351-3_27.

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Sato, S. "Measurement of Three-Dimensional Flame Temperature Fields by Holographic Interferometry and Computed Tomography." In Laser Diagnostics and Modeling of Combustion, 187–94. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-45635-0_24.

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Trolinger, James D., Ronald K. Hanson, Brandon Yip, and Brett Battles. "Resonant Holographic Interferometry — A Multipoint, Multiparameter Diagnostics Tool for Hypersonic Flow." In New Trends in Instrumentation for Hypersonic Research, 123–34. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1828-6_11.

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Nagashima, Akira, Yasunori Kawano, Takaki Hatae, and Soichi Gunji. "Development of Dual CO2 Laser Interferometer for Large Tokamak." In Diagnostics for Experimental Thermonuclear Fusion Reactors, 235–43. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-0369-5_28.

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Dewey, Daniel. "Data Analysis as a Noise Diagnostic: Looking for Transients in Interferometers." In Gravitational Wave Data Analysis, 255–68. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-1185-7_18.

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Conference papers on the topic "Interferometry diagnostics"

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Trolinger, James Davis, Jian Gao, Cecil F. Hess, and Amit K. Lal. "A new optical diagnostics tools for grading additive manufactured parts." In Interferometry XXI, edited by Michael B. North-Morris, Katherine Creath, and Rosario Porras-Aguilar. SPIE, 2022. http://dx.doi.org/10.1117/12.2633560.

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Ershov, A. I., V. B. Fedorov, and I. V. Fomenkov. "Diagnostics Of Low-Temperature Laser Plasma By Means Of Nonlinear Dispersion And Holographic Interferometry." In Interferometry '89, edited by Zbigniew Jaroszewicz, Maksymilian Pluta, Zbigniew Jaroszewicz, and Maksymilian Pluta. SPIE, 1990. http://dx.doi.org/10.1117/12.961325.

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Rinkevichius, Bronius S., A. V. Stepanov, and A. V. Tolkachev. "Fiber laser Doppler sensors for diagnostics of liquid and gas flows." In International Conference on Interferometry '94, edited by Eric Udd and Ralph P. Tatam. SPIE, 1994. http://dx.doi.org/10.1117/12.195549.

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Thurman, James, Daniel Kenan, and Richard Branam. "Hall Thruster Plume Diagnostics Utilizing Microwave Interferometry." In 48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2010. http://dx.doi.org/10.2514/6.2010-623.

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Blackshire, James L., and Shamachary Sathish. "Microcharacterization of MEMS ultrasonic transducers using laser interferometry." In NDE For Health Monitoring and Diagnostics, edited by Norbert Meyendorf, George Y. Baaklini, and Bernd Michel. SPIE, 2002. http://dx.doi.org/10.1117/12.469622.

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Benedetto, Marcus D. "Optimization of laser interferometry for pre-surgical diagnostics." In ICALEO® ‘87: Proceedings of the Laser Research in Medicine Conference. Laser Institute of America, 1987. http://dx.doi.org/10.2351/1.5057902.

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Buchta, Zdeněk, Bretislav Mikel, Simon Rerucha, Josef Lazar, and Ondrej Cip. "Light source for low-coherence interferometry surface diagnostics." In International Conference on Applications of Optics and Photonics, edited by Manuel F. Costa. SPIE, 2011. http://dx.doi.org/10.1117/12.892226.

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Trolinger, James, and Neal Brock. "New sandwich holographic interferometry techniques for flow diagnostics." In 34th Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1996. http://dx.doi.org/10.2514/6.1996-532.

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Frank, Anna. "Holographic Interferometry In Investigations Of The Current Sheet Plasmas." In 1st EPS conference on Plasma Diagnostics. Trieste, Italy: Sissa Medialab, 2016. http://dx.doi.org/10.22323/1.240.0003.

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Findeis, Dirk M., Jasson Gryzagoridis, and David R. Rowland. "Vibration isolation techniques suitable for portable electronic speckle pattern interferometry." In NDE For Health Monitoring and Diagnostics, edited by Andrew L. Gyekenyesi, Steven M. Shepard, Dryver R. Huston, A. Emin Aktan, and Peter J. Shull. SPIE, 2002. http://dx.doi.org/10.1117/12.470721.

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Reports on the topic "Interferometry diagnostics"

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Tringe, J. W., M. C. Converse, and R. J. Kane. Develop Prototype Microwave Interferometry Diagnostic. Office of Scientific and Technical Information (OSTI), November 2016. http://dx.doi.org/10.2172/1335776.

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Fleming, K. J. Portable, solid state, fiber optic coupled Doppler interferometer system for detonation and shock diagnostics. Office of Scientific and Technical Information (OSTI), August 1994. http://dx.doi.org/10.2172/10172045.

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