Готові списки джерел за темами / Multi-photon component

Добірка наукової літератури з теми "Multi-photon component"

Автор: Grafiati

Опубліковано: 14 березня 2023

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Статті в журналах з теми "Multi-photon component"

Pumpe, Daniel, Martin Reinecke, and Torsten A. Enßlin. "Denoising, deconvolving, and decomposing multi-domain photon observations." Astronomy & Astrophysics 619 (November 2018): A119. http://dx.doi.org/10.1051/0004-6361/201832781.

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Astronomical imaging based on photon count data is a non-trivial task. In this context we show how to denoise, deconvolve, and decompose multi-domain photon observations. The primary objective is to incorporate accurate and well motivated likelihood and prior models in order to give reliable estimates about morphologically different but superimposed photon flux components present in the data set. Thereby we denoise and deconvolve photon counts, while simultaneously decomposing them into diffuse, point-like and uninteresting background radiation fluxes. The decomposition is based on a probabilistic hierarchical Bayesian parameter model within the framework of information field theory (IFT). In contrast to its predecessor D3PO, D4PO reconstructs multi-domain components. Thereby each component is defined over its own direct product of multiple independent domains, for example location and energy. D4PO has the capability to reconstruct correlation structures over each of the sub-domains of a component separately. Thereby the inferred correlations implicitly define the morphologically different source components, except for the spatial correlations of the point-like flux. Point-like source fluxes are spatially uncorrelated by definition. The capabilities of the algorithm are demonstrated by means of a synthetic, but realistic, mock data set, providing spectral and spatial information about each detected photon. D4PO successfully denoised, deconvolved, and decomposed a photon count image into diffuse, point-like and background flux, each being functions of location as well as energy. Moreover, uncertainty estimates of the reconstructed fields as well as of their correlation structure are provided employing their posterior density function and accounting for the manifolds the domains reside on.

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Li, Wei, Ling Lin, Lei Bao, Longfei Zhao, and Gang Li. "Monte Carlo simulation of photon migration in multi-component media." Optical and Quantum Electronics 47, no. 7 (November 8, 2014): 1919–31. http://dx.doi.org/10.1007/s11082-014-0058-1.

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Huang, Ying, Yusheng Zhang, Yuming Su, Zhenghao Zhai, Jiawei Chen, and Cheng Wang. "Two-photon induced polymerization in a porous polymer film to create multi-layer structures." Chemical Communications 57, no. 37 (2021): 4516–19. http://dx.doi.org/10.1039/d1cc01383a.

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Kastner, Alexander, Greta Koumarianou, Pavle Glodic, Peter C. Samartzis, Nicolas Ladda, Simon T. Ranecky, Tom Ring, et al. "High-resolution resonance-enhanced multiphoton photoelectron circular dichroism." Physical Chemistry Chemical Physics 22, no. 14 (2020): 7404–11. http://dx.doi.org/10.1039/d0cp00470g.

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By combining molecular beam techniques with high resolution resonance enhanced multi photon ionization followed by angular resolved photoelectron detection we pave the way for enantiomer specific molecular identification in multi-component mixtures.

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Rebufello, E., F. Piacentini, M. López, R. A. Kirkwood, I. Ruo Berchera, M. Gramegna, G. Brida, et al. "Towards a standard procedure for the measurement of the multi-photon component in a CW telecom heralded single-photon source." Metrologia 56, no. 2 (February 22, 2019): 025004. http://dx.doi.org/10.1088/1681-7575/ab022e.

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Streed, E. W., B. G. Norton, J. J. Chapman, and D. Kielpinski. "Scalable, efficient ion-photon coupling with phase Fresnel lenses for large-scale quantum computing." Quantum Information and Computation 9, no. 3&4 (March 2009): 203–14. http://dx.doi.org/10.26421/qic9.3-4-2.

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Efficient ion-photon coupling is an important component for large-scale ion-trap quantum computing. We propose that arrays of phase Fresnel lenses (PFLs) are a favorable optical coupling technology to match with multi-zone ion traps. Both are scalable technologies based on conventional micro-fabrication techniques. The large numerical apertures (NAs) possible with PFLs can reduce the readout time for ion qubits. PFLs also provide good coherent ion-photon coupling by matching a large fraction of an ion's emission pattern to a single optical propagation mode (TEM$_{00}$). To this end we have optically characterized a large numerical aperture phase Fresnel lens (NA=0.64) designed for use at 369.5 nm, the principal fluorescence detection transition for Yb$^+$ ions. A diffraction-limited spot $w_0=350\pm15$ nm ($1/e^2$ waist) with mode quality $M^2= 1.08\pm0.05$ was measured with this PFL. From this we estimate the minimum expected free space coherent ion-photon coupling to be 0.64\%, which is twice the best previous experimental measurement using a conventional multi-element lens. We also evaluate two techniques for improving the entanglement fidelity between the ion state and photon polarization with large numerical aperture lenses.

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Kamada, Ayuki, Hee Jung Kim, Jong-Chul Park, and Seodong Shin. "Manifesting hidden dynamics of a sub-component dark matter." Journal of Cosmology and Astroparticle Physics 2022, no. 10 (October 1, 2022): 052. http://dx.doi.org/10.1088/1475-7516/2022/10/052.

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Abstract We emphasize the distinctive cosmological dynamics in multi-component dark-matter scenarios and their impact on probing a sub-dominant component of dark matter. The dynamics originate from the conversion among different dark-matter components. We find that the temperature of the self-interacting sub-component dark matter is significantly enhanced by the dark-matter annihilation into the sub-component. The same annihilation sharply increases the required annihilation cross section for the sub-component as we consider a smaller relative abundance fraction among the dark-matter species. Because of the enhanced temperature and couplings of the sub-component, contrary to a naive expectation, the sub-component with smaller abundance fractions tends to be disfavored by dark-matter direct/indirect-detection experiments and cosmological observations. We demonstrate this by taking a dark photon portal scenario for the sub-component at the sub-GeV mass scale. For the abundance fraction ≳ 10 %, the enhanced temperature of the sub-component is subject to warm dark matter constraints which are complementary to the parameter space probed by accelerator-based experiments. Smaller abundance fractions tend to be disfavored by accelerator-based experiments due to the enhanced coupling to Standard Model particles.

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Nash, B., D. T. Abell, R. Nagler, P. Moeller, M. Keilman, I. Pogorelov, N. Goldring, et al. "Combining diagnostics, modeling, and control systems for automated alignment of the TES beamline." Journal of Physics: Conference Series 2380, no. 1 (December 1, 2022): 012103. http://dx.doi.org/10.1088/1742-6596/2380/1/012103.

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Abstract X-ray beamlines are essential components of all synchrotron light sources. Practical operations involve frequent variation in beamline component positions and orientation, particularly when photon beam parameters shift due to experimental needs, or due to variations in the incoming photon beam. The alignment process can be time consuming and takes away from valuable beam time for experimental data collection. We describe progress in the automation of certain alignment tasks on the tender-energy X-ray spectroscopy (TES) beamline at the National Synchrotron Light Source II (NSLS-II). The beamline is controlled using the BlueSky software in which high level experimental plans guide the beamline components during an experiment. Numerous software packages exist for beamline modeling, and they may be tied to the beamline control system using a package we are continuing to develop called Sirepo-Bluesky. The photon beam distribution may be measured with fluorescent screens, and a relation between beam and machine state can be found by varying the mirror and aperture settings over a multi-dimensional range. We describe the results of such parameter varying measurements and how we are combining Sirepo-Bluesky with machine learning methods and reduced models to automate mirror alignment on the TES beamline.

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KODAMA, HIDEO, and MISAO SASAKI. "EVOLUTION OF ISOCURVATURE PERTURBATIONS II: RADIATION-DUST UNIVERSE." International Journal of Modern Physics A 02, no. 02 (April 1987): 491–560. http://dx.doi.org/10.1142/s0217751x8700020x.

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Density perturbations in a universe in which matter consists of noninteracting nonrelativistic particles(dust) and strongly coupled photon-baryon fluid(radiation) are analyzed in terms of the gauge-invariant formalism extended to a multi-component system. Detailed analytic estimate is presented for the time evolution of both primordially adiabatic and primordially isocurvature perturbations. In particular, analytic formulas for characteristic scales appearing in the transfer functions are derived. The evolutionary behavior of these two types of perturbations are compared and the origins of their differences and similarities are clarified.

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Liprandi, Silvia, Michael Mayerhofer, Saad Aldawood, Tim Binder, George Dedes, Agnese Miani, Dennis R. Schaart, Ingrid I. Valencia Lozano, Katia Parodi, and Peter G. Thirolf. "Sub-3mm spatial resolution from a large monolithic LaBr3 (Ce) scintillator." Current Directions in Biomedical Engineering 3, no. 2 (September 7, 2017): 655–59. http://dx.doi.org/10.1515/cdbme-2017-0138.

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AbstractA Compton camera prototype for ion beam range monitoring via prompt (< 1 ns) gamma detection in hadron therapy is being developed and characterized at the Medical Physics Department of LMU Munich. The system consists of a large (50x50x30 mm3) monolithic LaBr3(Ce) scintillation crystal as absorber component to detect the multi-MeV Compton scattered photons, together with a stack of 6 double-sided silicon strip detectors (DSSSD) acting as scatterer component. Key ingredient of the γ-source reconstruction is the determination of the γ-ray interaction position in the scintillator, which is read out by a 256-fold segmented multi-anode photomultiplier tube (PMT). From simulations an angular resolution of about 1.5o for the photon source reconstruction can be expected for the energy range around 3 – 5 MeV, provided that a spatial resolution of 3 mm can be reached in the absorbing scintillator [1]. Therefore, particular effort was dedicated to characterize this latter property as a function of the γ-ray energy. Intense, tightly collimated 137Cs and 60Co photon sources were used for 2D irradiation scans (step size 0.5 mm) as prerequisite for studying the performance of the “k-Nearest-Neighbors” algorithm developed at TU Delft [2] (together with its variant ”Categorical Average Pattern”, CAP) and extending its applicability into the energy range beyond the original 511 keV. In this paper we present our most recent interaction position analysis in the absorbing scintillator, leading to a considerably improved value for the spatial resolution: systematic studies were performed as a function of the k-NN parameters and the PMT segmentation. A trend of improving spatial resolution with increasing photon energy was confirmed, resulting in the realization of the presently optimum spatial resolution of 2.9(1) mm @1.3 MeV, thus reaching the design specifications of the Compton camera absorber. The specification goal was reached also for a reduced PMT segmentation of 8x8 anode segments (each with 6x6 mm2 active area), thus allowing to reduce the complexity of the signal processing while preserving the performance.

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Частини книг з теми "Multi-photon component"

Chouhan, Er R. K., and Manish Mudgal. "Novel Radiation Shielding Concrete Utilizing Industrial Waste for Gamma-Ray Shielding." In Smart Materials Design for Electromagnetic Interference Shielding Applications, 527–54. BENTHAM SCIENCE PUBLISHERS, 2022. http://dx.doi.org/10.2174/9789815036428122010015.

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For the first time, the capability of red mud waste has been explored for the development of advanced synthetic radiation shielding aggregate and radiation shielding concrete. Red mud, an aluminium industry waste, consists of multi.component and multi-elemental characteristics. Approximately two tons of red mud are generated for every ton of aluminium production. There are about 85 alumina plants all over the world, thus leading to the generation of about 77 million tons of highly alkaline waste annually. The major mineral content of red mud waste includes hematite, anatase, and cancrinite, thus making red mud waste the most suitable multi.component resource material for developing multi phases containing shielding aggregate. Further, these multi-elements in the red mud are present in the form of oxide, oxy-hydroxide, and hydroxides, having low as well as high atomic number elements, namely sodium, iron, titanium compounds, respectively, and are non-toxic in nature. The concrete possessing specific gravity higher than 2600 kg/m3 is known as heavyweight concrete, and aggregate with specific gravities higher than 3000 kg/m3 is called heavyweight aggregate as per TS EN 206-1 (2002). The shielding aggregate contains both naturally occurring as well as some of the artificial aggregate. The natural aggregate includes hematite, magnetite, limonite barite, etc., which are non.replenishable and are useful for many other important applications, and the artificial aggregate includes the use of iron shots and steel filing and in some cases, lead shots, etc. The use of lead shots makes the material toxic in nature, therefore, there is a need to avoid the use of lead-based materials for shielding applications, as it ranks second in the list of hazardous materials. Apart from toxicity associated with lead, the low melting point of lead is also prohibitive as the shielding concrete should be preferably heat and fire-resistant. Further, all the natural minerals inherently contain only a single shielding phase, therefore, conventionally shielding concretes are developed by a combination of various natural minerals, which leads to an inhomogeneous radiation shielding matrix in the developed conventional radiation shielding concrete. In view of the above, there is an urgent need to develop advanced non-toxic synthetic shielding aggregate capable of providing homogeneous radiation shielding matrix preferably obviating the use of toxic lead and conventional non-replenishable natural minerals resources. In this chapter, aluminium industrial waste, i.e., red mud, has been utilized. Chemical formulation and mineralogical designing of the red mud has been done by ceramic processing using appropriate reducing agents and additives. The chemical analysis, SEM microphotographs, and XRD analysis confirm the presence of multi-component, multi shielding, and multi-layered phases in developed advanced synthetic radiation shielding aggregate. The maximum density of developed synthetic aggregate is found to be 4.16 g/cc. The mechanical properties, namely aggregate impact value, aggregate crushing value, and aggregate abrasion value, have been evaluated and was compared with hematite ore aggregate and found to be an excellent material useful for making advanced radiation shielding concrete for the construction of nuclear power plants and other radiation installations. For the first time, the development and design mix of novel radiation shielding concrete using innovative red mud-based synthetic shielding aggregates have been carried out in which the heavy density shielding aggregates are developed using red mud and are basically ceramic materials consisting of shielding phases, namely barium silicate (san-bornite), barium iron titanium silicate (bafertisite), barium aluminium silicate, iron titanium oxide (pseudorutile), barium titanate, barium iron titanium oxide, barium aluminium oxide, and magnetite, which are multi-elemental, multi phases, multi-layered crystal structures, therefore, they are excellent shielding materials. The radiation shielding concrete was made using developed synthetic shielding aggregates adopting IS 10262-2009 standard for grade designation of M-30 concrete. The reference hematite ore concrete and developed concrete tested for radiation shielding attenuation properties for gamma rays using 137Cs (of photon energy 662 keV) and 241Am (of photon energy 60 keV) were found to possess highly effective shielding properties. The developed novel design mix concrete achieved an attenuation factor of 5.8 as compared to 5.1 attenuation factor for reference hematite ore concrete. The developed radiation shielding concrete using red mud-based synthetic shielding aggregates possess a broad application spectrum ranging from the construction of diagnostic X-ray, CT scanner rooms, and storing radioactive waste to nuclear power plants.

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Тези доповідей конференцій з теми "Multi-photon component"

Naitoh, K., T. Ishii, and J. I. Mitsuhashi. "Investigation of Multi-Level Metallization ULSls by Light Emission from the Back-Side and Front-Side of the Chip." In ISTFA 1997. ASM International, 1997. http://dx.doi.org/10.31399/asm.cp.istfa1997p0145.

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Abstract Advanced ASIC devices with multi-level metallization and high density DRAMs with lead-on-chip (LOC) packages are becoming more difficult to analyze using emission microscopy from the Front-side of the chip (Front-side EMS). In this paper, we have found that evaluation of the wavelength spectrum from the back-side of the chip (Back-side EMS) could be used as easily as Front-side EMS. We investigated the wavelength spectrum of light emitted from the backside of the chip and the front-side of the chip, and calculated a photon counting ratio of the Back-side EMS and Front-side EMS for several different failure mechanisms. The wavelength spectra also showed that all light emissions had a component of Infrared (IR) light with wavelength longer than 900nm. The minimum ratio in the various failure mechanisms is 40%. From these data, Back-side EMS can be applied to the analysis of various failure mechanisms. Although the thickness of silicon substrate using for the spectrum measurement is from 204um to 380um, the measured values are not affected by the thickness. Therefore, in the Back-side EMS, the light emission can be detected without strict control of chip thinning.

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Bravo, Luis, Qingluan Xue, Sibendu Som, Christopher Powell, and Chol-Bum M. Kweon. "Fuel Effects on Nozzle Flow and Spray Using Fully Coupled Eulerian Simulations." In ASME 2015 Power Conference collocated with the ASME 2015 9th International Conference on Energy Sustainability, the ASME 2015 13th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2015 Nuclear Forum. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/power2015-49554.

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The objective of this study is to examine the impact of single and multi-component surrogate fuel mixtures on the atomization and mixing characteristics of non-reacting isothermal diesel engine sprays. An Eulerian modeling approach was adopted to simulate both the internal nozzle flow dynamics and the emerging turbulent spray in the near nozzle region in a fully-coupled manner. The Volume of Fluids (VoF) methodology was utilized to treat the two-phase flow dynamics including a Homogenous Relaxation approach to account for nozzle cavitation effects. To enable accurate simulations, the nozzle geometry and in-situ multi-dimensional needle lift and off-axis motion profiles have been characterized via the X-ray phase-contrast technique at Argonne National Laboratory. The flow turbulence is treated via the classical k–ϵ Reynolds Average Navier Stoke (RANS) model with in-nozzle and near field resolution of 30 μm. Several multi-component surrogate mixtures were implemented using linear blending rules to examine the behavior of petroleum, and alternative fuels including: JP-8, JP-5, Hydro-treated Renewable Jet (HRJ), Iso-Paraffinic Kerosene (IPK) with comparison to single-component n-dodecane fuel on ECN Spray A nozzle spray dynamics. The results were validated using transient rate-of-injection measurements from the Army Research Laboratory at Spray A conditions as well as projected density fields obtained from the line-of-sight measurements from X-ray radiography measurements at The Advanced Photon Source at Argonne National Laboratory. The conditions correspond to injection pressure, nominal fuel temperature, and ambient density of 1500 bar, 363 K, and 22.8 kg/m3, respectively. The simulation results provide a unique high-fidelity contribution to the effects of fuels on the spray mixing dynamics. The results can lead to improvements in fuel mixture distributions enhancing performance of military vehicles.

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Godfrey, Stephen, and Alexandre Poulin. "Multi-component dark matter from a hidden gauged SU(3)." In XXIX International Symposium on Lepton Photon Interactions at High Energies. Trieste, Italy: Sissa Medialab, 2019. http://dx.doi.org/10.22323/1.367.0111.

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PUENTES, G., L. ZHANG, H. COLDENSTRODT-RONGE, O. COHEN, B. J. SMITH, N. THOMAS-PETER, and I. A. WALMSLEY. "COMPONENTS FOR MULTI-PHOTON NON-CLASSICAL STATE PREPARATION AND MEASUREMENT." In Proceedings of the XIX International Conference. WORLD SCIENTIFIC, 2010. http://dx.doi.org/10.1142/9789814282345_0014.

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Song, Feng, Kang Zhang, Lin Han, Jing Su, Shibin Jiang, and Jianguo Tian. "Analysis into different multi-photon processes participating in upconversion luminescence of Er: NaY(WO." In Optical Components and Materials IV. SPIE, 2007. http://dx.doi.org/10.1117/12.707904.

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Rohlfing, E. A., and D. W. Chandler. "Laser spectroscopy of jet-cooled chlorinated aromatic hydrocarbons." In International Laser Science Conference. Washington, D.C.: Optica Publishing Group, 1986. http://dx.doi.org/10.1364/ils.1986.tue5.

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The ultrasensitive and isomerically selective detection of chlorinated aromatic hydrocarbons is currently a problem of particular concern due to the toxic and/or carcinogenic nature of these species and their widespread presence in the environment. In this work laser-induced fluorescence and resonantly enhanced multi photon ionization (REMPI) are applied to a series of mono- and dichloronaphthalenes that are rotationally cooled in a free jet expansion. Both techniques provide isomeric selectivity in the S1-S0 spectral region; however 1 + 2 REMPI is more sensitive. In the REMPI spectra of the dichloronapthalenes (DCNs) the S1-S0 origins of different positional isomers are separated by as much as 424 cm-1. Low resolution time-of-flight (TOF) mass spectra of the DCNs show the REMPI ion fragmentation pattern to be isomer dependent. The additional selectivity that isomer-dependent frag mentation provides is demonstrated by the different relative intensities observed in the parent and fragment ion REMPI spectra of a three-component DCN mixture. Possible extensions of the REMPI technique, including two-color, 1 + 1 REMPI for enhanced sensitivity and high-resolution TOF mass spectrometry for enhanced isomeric selectivy, are discussed.

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Schumacher, D. W., F. Weihe, H. G. Muller, and P. H. Bucksbaum. "Phase-dependent ionization by using an intense two-color light field with a calibrated phase difference." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1993. http://dx.doi.org/10.1364/oam.1993.ws.7.

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We report the first study of Multi-Photon Ionization (MPI) using an intense two-color light field whose relative phase is known. The light field was produced by overlapped 80 ps pulses of 1.06 µm and .532 µm at various intensities and the phase difference was measured using non-linear mixing in KD*P. The light was focused into a chamber backfilled with Krypton gas, and the photoelectron energy spectrum was measured. We observed periodic variation of the MPI photoelectron peaks as a function of phase; moreover, the variation was seen to be asymmetric with respect to a change of sign in phase. The degree of asymmetry varied in a regular way as a function of intensity and peak energy. In general, the peak ionization rate was not observed to occur at the phase difference that produced the peak field. These effects were predicted for Hydrogen by Schaffer et al.,1 and are believed to be general in nature. We also report the effect of adding a small circular polarization component to the light field and the implications for a theory recently advanced by Corkum.2E Finally, we discuss the origin of these effects.

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Kathaperumal, Mohan, Bai Nie, Pragna Bhaskar, Christopher Blancher, Pratik Nimbalkar, Fuhan Liu, and Madhavan Swaminathan. "Two-/Multi-Photon Imaging for Characterization of Fine Line Features and Microvias in Advanced Packaging." In 2022 IEEE 72nd Electronic Components and Technology Conference (ECTC). IEEE, 2022. http://dx.doi.org/10.1109/ectc51906.2022.00264.

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Wiseall, S. S., R. Thomas, and P. Butler. "The Application of a Laser Doppler Anemometer system to a high speed multi-stage Compressor using a Digital Burst Correlator." In Photon Correlation and Scattering. Washington, D.C.: Optica Publishing Group, 1996. http://dx.doi.org/10.1364/pcs.1996.tha.1.

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Two component LDA velocity measurements have been made in three axial planes: just downstream of the Inlet Guide Vanes, (IGVs); the rotor and stators of a high speed aeroengine Compressor. At each axial stage circumferential measurements over a 22.5 degree arc were made in 0.25 degree interval steps at 21 radial heights between 2% and 98 %. The latter corresponds to high quality velocity measurement data less than 0.5 mm from the rig window. Overall, the data collection corresponds to over 10,000 2D velocity measurements with between 3-7000 velocity samples per spatial location. Some of these data are illustrated in the 3D contour plots shown of the measured IGV velocity magnitude and the flow angle. These data and other similar data at the other axial locations have been used to help develop new blade designs and validate Computational Fluid Dynamic codes. The sharp IGV wakes were resolved in 0.05 degree angular steps, each wake being some 0.4 degrees wide. The results show the very severe velocity gradient through the wake and the significant variation in flow angle in the boundary layer, (up to 20 % annulus height and above 80 % annulus height). The stability of the LDA system and the measurement rig was such that circumferential velocity profiles measured 12 days apart deviated at most by less than 0.5 %. Comparison with conventional instrumentation in measurement regions where this was valid has shown agreement to within 0.2 %.

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Basdogan, Ipek, Thomas J. Royston, Juan Barraza, Deming Shu, and Tuncer M. Kuzay. "A Theoretical and Experimental Study of the Vibratory Behavior of a High-Precision Optical Positioning Table." In ASME 1997 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/detc97/vib-4215.

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Abstract At the Advanced Photon Source (APS), a state-of-the-art synchrotron radiation facility at Argonne National Laboratory (ANL), high-precision optical positioning systems are needed to conduct a wide range of experiments utilizing the high-brilliance x-ray beam. The high-precision, multi-dimensional positioning capability required for these positioning systems may be compromised by vibratory motion. The vibratory dynamics of the complex kinematic joints and components that comprise these multibody structures are not easily described by simple theoretical models. A combined experimental and theoretical approach has been developed to predict the dynamic properties of the individual components and joints and of the assembled multibody system. A prototypical optical table has been analyzed as an example case.

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