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Littérature scientifique sur le sujet « Laser-based ion acceleration »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 10 mars 2023

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Articles de revues sur le sujet "Laser-based ion acceleration"

Sommer, P., J. Metzkes-Ng, F.-E. Brack, T. E. Cowan, S. D. Kraft, L. Obst, M. Rehwald, H.-P. Schlenvoigt, U. Schramm et K. Zeil. « Laser-ablation-based ion source characterization and manipulation for laser-driven ion acceleration ». Plasma Physics and Controlled Fusion 60, n^o 5 (16 mars 2018) : 054002. http://dx.doi.org/10.1088/1361-6587/aab21e.

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Tayyab, M., S. Bagchi, J. A. Chakera, D. K. Avasthi, R. Ramis, A. Upadhyay, B. Ramakrishna, T. Mandal et P. A. Naik. « Mono-energetic heavy ion acceleration from laser plasma based composite nano-accelerator ». Physics of Plasmas 25, n^o 12 (décembre 2018) : 123102. http://dx.doi.org/10.1063/1.5053640.

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Uesaka, Mitsuru, et Kazuyoshi Koyama. « Advanced Accelerators for Medical Applications ». Reviews of Accelerator Science and Technology 09 (janvier 2016) : 235–60. http://dx.doi.org/10.1142/s1793626816300115.

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We review advanced accelerators for medical applications with respect to the following key technologies: (i) higher RF electron linear accelerator (hereafter “linac”); (ii) optimization of alignment for the proton linac, cyclotron and synchrotron; (iii) superconducting magnet; (iv) laser technology. Advanced accelerators for medical applications are categorized into two groups. The first group consists of compact medical linacs with high RF, cyclotrons and synchrotrons downsized by optimization of alignment and superconducting magnets. The second group comprises laser-based acceleration systems aimed of medical applications in the future. Laser plasma electron/ion accelerating systems for cancer therapy and laser dielectric accelerating systems for radiation biology are mentioned. Since the second group has important potential for a compact system, the current status of the established energy and intensity and of the required stability are given.

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Torrisi, Lorenzo, Lucia Calcagno, Mariapompea Cutroneo, Jan Badziak, Marcin Rosinski, Agnieszka Zaras-Szydlowska et Alfio Torrisi. « Nanostructured targets for TNSA laser ion acceleration ». Nukleonika 61, n^o 2 (1 juin 2016) : 103–8. http://dx.doi.org/10.1515/nuka-2016-0018.

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AbstractNanostructured targets, based on hydrogenated polymers with embedded nanostructures, were prepared as thin micrometric foils for high-intensity laser irradiation in TNSA regime to produce high-ion acceleration. Experiments were performed at the PALS facility, in Prague, by using 1315 nm wavelength, 300 ps pulse duration and an intensity of 1016W/cm2and at the IPPLM, in Warsaw, by using 800 nm wavelength, 40 fs pulse duration, and an intensity of 1019W/cm2. Forward plasma diagnostic mainly uses SiC detectors and ion collectors in time of flight (TOF) configuration. At these intensities, ions can be accelerated at energies above 1 MeV per nucleon. In presence of Au nanoparticles, and/or under particular irradiation conditions, effects of resonant absorption can induce ion acceleration enhancement up to values of the order of 4 MeV per nucleon.

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Weichman, K., A. P. L. Robinson, M. Murakami, J. J. Santos, S. Fujioka, T. Toncian, J. P. Palastro et A. V. Arefiev. « Progress in relativistic laser–plasma interaction with kilotesla-level applied magnetic fields ». Physics of Plasmas 29, n^o 5 (mai 2022) : 053104. http://dx.doi.org/10.1063/5.0089781.

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We report on progress in the understanding of the effects of kilotesla-level applied magnetic fields on relativistic laser–plasma interactions. Ongoing advances in magnetic-field–generation techniques enable new and highly desirable phenomena, including magnetic-field–amplification platforms with reversible sign, focusing ion acceleration, and bulk-relativistic plasma heating. Building on recent advancements in laser–plasma interactions with applied magnetic fields, we introduce simple models for evaluating the effects of applied magnetic fields in magnetic-field amplification, sheath-based ion acceleration, and direct laser acceleration. These models indicate the feasibility of observing beneficial magnetic-field effects under experimentally relevant conditions and offer a starting point for future experimental design.

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Schumacher, D. W., P. L. Poole, C. Willis, G. E. Cochran, R. Daskalova, J. Purcell et R. Heery. « Liquid Crystal Targets and Plasma Mirrors For Laser Based Ion Acceleration ». Journal of Instrumentation 12, n^o 04 (27 avril 2017) : C04023. http://dx.doi.org/10.1088/1748-0221/12/04/c04023.

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Cutroneo, Mariapompea, Lorenzo Torrisi, Jan Badziak, Marcin Rosinski, Vladimir Havranek, Anna Mackova, Petr Malinsky et al. « Graphite oxide based targets applied in laser matter interaction ». EPJ Web of Conferences 167 (2018) : 02004. http://dx.doi.org/10.1051/epjconf/201816702004.

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In the present work, we propose the production of a hybrid graphene based material suitable to be laser irradiated with the aim to produce quasi-monoenergetic proton beams using a femtosecond laser system. The unique lattice structure of the irradiated solid thin target can affect the inside electron propagation, their outgoing from the rear side of a thin foil, and subsequently the plasma ion acceleration. The produced targets, have been characterized in composition, roughness and structure and for completeness irradiated. The yield and energy of the ions emitted from the laser-generated plasma have been monitored and the emission of proton stream profile exhibited an acceleration of the order of several MeVs/charge state.

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Chagovets, Timofej, Stanislav Stanček, Lorenzo Giuffrida, Andriy Velyhan, Maksym Tryus, Filip Grepl, Valeriia Istokskaia et al. « Automation of Target Delivery and Diagnostic Systems for High Repetition Rate Laser-Plasma Acceleration ». Applied Sciences 11, n^o 4 (13 février 2021) : 1680. http://dx.doi.org/10.3390/app11041680.

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Fast solid target delivery and plasma-ion detection systems have been designed and developed to be used in high intensity laser-matter interaction experiments. We report on recent progress in the development and testing of automated systems to refresh solid targets at a high repetition rate during high peak power laser operation (>1 Hz), along with ion diagnostics and corresponding data collection and real-time analysis methods implemented for future use in a plasma-based ion acceleration beamline for multidisciplinary user applications.

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Torrisi, Lorenzo, Mariapompea Cutroneo et Jiri Ullschmied. « HYDROGENATED TARGETS FOR HIGH ENERGY PROTON GENERATION FROM LASER IRRADIATING IN TNSA REGIME ». Acta Polytechnica 55, n^o 3 (30 juin 2015) : 199–202. http://dx.doi.org/10.14311/ap.2015.55.0199.

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<p>Polyethylene-based thin targets were irradiated in high vacuum in the TNSA (Target Normal Sheath Acceleration) regime using the PALS laser facility. The plasmais produced in forward direction depending on the laser irradiation conditions, the composition of the target and the geometry. The optical properties of the polymer use nanostructures to increase the laser absorbance. Proton kinetic energies from hundreds keV up to about 3MeV were obtained for optimal conditions enhancing the electric field driving the ion acceleration.</p>

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Li, Dongyu, Tang Yang, Minjian Wu, Zhusong Mei, Kedong Wang, Chunyang Lu, Yanying Zhao et al. « Introduction of Research Work on Laser Proton Acceleration and Its Application Carried out on Compact Laser–Plasma Accelerator at Peking University ». Photonics 10, n^o 2 (28 janvier 2023) : 132. http://dx.doi.org/10.3390/photonics10020132.

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Laser plasma acceleration has made remarkable progress in the last few decades, but it also faces many challenges. Although the high gradient is a great potential advantage, the beam quality of the laser accelerator has a certain gap, or it is different from that of traditional accelerators. Therefore, it is important to explore and utilize its own features. In this article, some recent research progress on laser proton acceleration and its irradiation application, which was carried out on the compact laser plasma accelerator (CLAPA) platform at Peking University, have been introduced. By combining a TW laser accelerator and a monoenergetic beamline, proton beams with energies of less than 10 MeV, an energy spread of less than 1%, and with several to tens of pC charge, have been stably produced and transported in CLAPA. The beamline is an object–image point analyzing system, which ensures the transmission efficiency and the energy selection accuracy for proton beams with large initial divergence angle and energy spread. A spread-out Bragg peak (SOBP) is produced with high precision beam control, which preliminarily proved the feasibility of the laser accelerator for radiotherapy. Some application experiments based on laser-accelerated proton beams have also been carried out, such as proton radiograph, preparation of graphene on SiC, ultra-high dose FLASH radiation of cancer cells, and ion-beam trace probes for plasma diagnosis. The above applications take advantage of the unique characteristics of laser-driven protons, such as a micron scale point source, an ultra-short pulse duration, a wide energy spectrum, etc. A new laser-driven proton therapy facility (CLAPA II) is being designed and is under construction at Peking University. The 100 MeV proton beams will be produced via laser–plasma interaction by using a 2-PW laser, which may promote the real-world applications of laser accelerators in malignant tumor treatment soon.

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Thèses sur le sujet "Laser-based ion acceleration"

PEREGO, CLAUDIO. « Target normal sheath acceleration for laser-driven ion generation : advances in theoretical modeling ». Doctoral thesis, Università degli Studi di Milano-Bicocca, 2013. http://hdl.handle.net/10281/41758.

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Recently, ultra-intense laser-driven ion acceleration has turned out to be an extremely interesting phenomenon, capable to produce ion beams which could potentially be suitable for applications as hadron therapy or dense matter diagnostics. The present PhD thesis is addressed to the study of Target Normal Sheath Acceleration (TNSA), namely the laser-based ion acceleration mechanism which dominates the presently accessible experimental conditions. The work is focused in particular on the theoretical modeling of TNSA, motivated by the need for an effective description which, by adopting proper approximations that can limit the required computational efforts, is capable to provide reliable predictions on the resulting ion beam features, given an initial laser-target configuration. Indeed, the development of a robust TNSA theoretical model would mean a deeper comprehension of the key physical factors governing the process, allowing at the same time to draw guidelines for potential experiments in the next future. In this dissertation, in order to achieve a significant advancement in the TNSA modeling field, the results of two original works are reported, the first is focused on a critical, quantitative analysis of existing descriptions, and the second, starting from the conclusions of such an analysis, is dedicated to the extension of a specific model, aiming at the inclusion of further, crucial, TNSA aspects. The quantitative analysis consists in the comparison of six well-known published descriptions, relying on their capability in estimating the maximum ion energy, which is tested over an extensive database of published TNSA experimental results, covering a wide range of laser-target conditions. Such a comparative study, despite the technical issues to be faced in order to reduce the arbitrariness of the results, allows to draw some interesting conclusions about the effectiveness of the six models considered and about TNSA effective modeling in general. According to the results, the quasi-static model proposed by M. Passoni and M. Lontano turns out to be the most reliable in predicting the ion cut-off energy, at the same time achieving such estimates through a self-consistent treatment of the accelerating potential. This work highlights also the limits of such a TNSA model, and of the main approximations usually adopted to obtain the different maximum ion energy estimates. Thus, starting from such considerations, an extension of this Passoni-Lontano model is proposed, including new crucial elements of TNSA physics within the description. In particular, further insights of the hot electron population dynamics are implemented, leading to a refined maximum energy prediction, which exhibits more solid theoretical bases, and which broadens the predicting capability of the original model to a larger range of system parameters. The resulting estimates are validated by means of literature experimental data and numerical simulations, demonstrating a remarkable agreement in most of the cases. The achieved model turns out to be particularly suitable in reproducing the maximum ion energy dependence on the target thickness, while some promising insights are obtained in the Mass Limited Targets (MLT) case. Nonetheless, further theoretical work is still required to attain a quantitative agreement with recently published experimental results on MLTs.

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Gangolf, Thomas. « Intense laser-plasma interactions with gaseous targets for energy transfer and particle acceleration ». Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLX110.

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Le plus fréquemment, l’interaction laser-matière est étudiée avec des lasers ayant des longueurs d’onde dans l’infrarouge proche (PIR), car ce sont les lasers qui peuvent générer les impulsions les plus intenses. Pour ces lasers, des cibles de densité allant de 0,05 à 2,5 fois la densité critique sont difficiles à créer mais elles offrent des perspectives intéressantes. Dans cette thèse, des jets d’hydrogène ayant de densité dans ce domaine sont utilisées dans le contexte de deux applications :Premièrement, des ions sont accélérées par choc non-collisionnel (collisionless shock acceleration, CSA). Lors de l’interaction d’une impulsion laser PIR avec une cible légè- rement sur-critique, un faisceau de protons est généré. Il est collimé, dirigé vers l’avant et quasiment monoénergetique. Des simulations indiquent que cela est lié à la formation d’un choc non-collisionnel et à l’accélération des protons par ce choc, en sus de leur accélération par le processus standard dit ”target normal sheath acceleration (TNSA)” qui est effectif en face arrière de la cible. Pour beaucoup d’applications, ces faisceaux de particules quasi-monoénergetiques sont plus appropriés que ceux à spectre large qui sont générés de façon routinière par TNSA.Deuxièmement, de l’énergie est transférée d’une impulsion laser (pump) vers une autre en contrepropagation (seed), par rétrodiffusion Brillouin stimulée, dans le régime de couplage fort (strong coupling-SBS), à des densités entre 0,05 et 0,2 fois la densité critique. Pour des impulsions à large bande (60 nanomètres), le rôle de la pré-ionisation sur la propagation et la rétrodiffusion Brillouin spontanée et stimulée est étudié, en incluant l’influence du chirp. Pour des lasers à bande plus étroite, il est démontré que l’impulsion seed peut être amplifiée par des dizaines de milliJoules, et des signatures d’amplification efficace et d’affaiblissement de l’impulsion laser pompe sont trouvées. Ce concept vise à l’amplification des impulsions laser à des puissances au-delà du seuil de dommage des amplificateurs laser basés sur des matériaux solides
Laser-matter interaction is studied mostly with near-infrared (NIR) lasers as they can generate the most intense pulses. For these lasers, targets between 0.05 to 2.5 times the critical density are challenging to create but offer interesting prospects. In this thesis, novel high-density Hydrogen gas jet targets with densities in this range are used in view of two applications:First, ions are accelerated by collisionless shock acceleration (CSA). Upon interaction of a NIR laser with a slightly overcritical gas jet target, a collimated, quasi-monoenergetic proton beam is generated in forward direction. Simulations indicate the formation of a collisionless shock and acceleration of protons both by the shock and target normal sheath acceleration (TNSA) on the target rear surface under these conditions. These directed, monoenergetic particle bunches are more suitable for many applications than the broadband particle beams already generated routinely.Second, at densities between 0.05 and 0.2 times the critical density, energy is transferred from one laser pulse (pump) to a counterpropagating pulse (seed), via Stimulated Brillouin Backscattering in the strongly-coupled regime (sc-SBS). For the case of broad- band (60 nanometers) pulses, the role of the preionization for pulse propagation and both spontaneous and stimulated Brillouin backscattering are studied, including the influence of the chirp. It is shown that for narrower bandwidths, the seed pulse is ampli- fied by tens of millijoules, and signatures of efficient amplification and pump depletion are found. This concept aims at amplifying laser pulses to powers above the damage thresholds of solid state amplifiers

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Kiefer, Thomas [Verfasser], Malte C. [Akademischer Betreuer] Kaluza, Stefan [Akademischer Betreuer] Skupin, Patrick [Akademischer Betreuer] Mora et Vladimir T. [Akademischer Betreuer] Tikhonchuk. « Investigation of the laser-based Target Normal Sheath Acceleration (TNSA) process for high-energy ions : an analytical and numerical study / Thomas Kiefer. Gutachter : Malte C. Kaluza ; Stefan Skupin ; Patrick Mora ; Vladimir T. Tikhonchuk ». Jena : Thüringer Universitäts- und Landesbibliothek Jena, 2014. http://d-nb.info/1050977742/34.

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Popov, Konstantin. « Laser based acceleration of charged particles ». Phd thesis, 2009. http://hdl.handle.net/10048/791.

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Thesis (Ph. D.)--University of Alberta, 2009.
Title from pdf file main screen (viewed on Jan. 5, 2010). "A thesis submitted to the Faculty of Graduate Studies and Research in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Physics, Department of Physics, University of Alberta." Includes bibliographical references.

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Chapitres de livres sur le sujet "Laser-based ion acceleration"

Ji, Liangliang. « Extreme Light Field Generation I : Quasi-Single-Cycle Relativistic Laser Pulse ». Dans Ion acceleration and extreme light field generation based on ultra-short and ultra–intense lasers, 57–64. Berlin, Heidelberg : Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-54007-3_4.

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Ji, Liangliang. « Extreme Light Field Generation II : Short-Wavelength Single-Cycle Ultra-Intense Laser Pulse ». Dans Ion acceleration and extreme light field generation based on ultra-short and ultra–intense lasers, 65–72. Berlin, Heidelberg : Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-54007-3_5.

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Schlenvoigt, Hans-Peter, Oliver Jckel, Sebastian M. et Malte C. « Laser-based Particle Acceleration ». Dans Advances in Solid State Lasers Development and Applications. InTech, 2010. http://dx.doi.org/10.5772/7965.

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Liu, Yi. « Urban Land Subsidence Analysis Based on Oblique Photogrammetry 3D Models and InSAR Technology ». Dans Advances in Transdisciplinary Engineering. IOS Press, 2022. http://dx.doi.org/10.3233/atde220881.

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With the rapid socio-economic development in the past three decades, the pace of urban construction in Shenzhen has been accelerating, and the ground subsidence phenomenon in Shenzhen has been intensifying. The widespread ground subsidence in Shenzhen produces important hazards to the urban environment and important urban infrastructures, leading to disasters such as tilting and collapse of buildings, and back-up of seawater. In this paper, based on satellite synthetic aperture radar interferometry (InSAR) technology to obtain the overall subsidence information in Nanshan District, Shenzhen, we use high-precision laser point cloud, 3D building model and other data to monitor the specific subsidence information of buildings and carry out the risk assessment of housing buildings in Nanshan District to provide scientific decision-making basis for its subsidence cause analysis and prevention and control.

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Mohamed, Zulkifli, et Genci Capi. « Assistive Intelligent Humanoid Robot in Human Environment ». Dans Rapid Automation, 887–915. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-8060-7.ch040.

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The number of robots operating in human environments is increasing every day. In order to operate in such environments, the robot must be able to navigate, interact with human, pick and place different objects. This chapter presents a mobile humanoid robot that is able to localize itself, navigate to the target location, and generates the arm motion based on the specific task. The robot utilizes the Laser Range Finder, camera and compass sensor for localization and navigation. In addition, the robot generates the arm motion satisfying multiple motion criteria, simultaneously. This chapter evolves neural controllers that generate the humanoid robot arm motion in dynamic environment optimizing three different objective functions: minimum time, distance and acceleration. In a single ran of Multi-Objective Genetic Algorithm, multiple neural controllers are generate and the same neural controller can be employed to generate the robot motion for a wide range of initial and goal positions.

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Knabe, Annike, Manuel Schilling, Hu Wu, Alireza HosseiniArani, Jürgen Müller, Quentin Beaufils et Franck Pereira dos Santos. « The Benefit of Accelerometers Based on Cold Atom Interferometry for Future Satellite Gravity Missions ». Dans International Association of Geodesy Symposia. Berlin, Heidelberg : Springer Berlin Heidelberg, 2022. http://dx.doi.org/10.1007/1345_2022_151.

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AbstractSatellite gravity missions, like GRACE and GRACE Follow-On, successfully map the Earth’s gravity field and its change over time. With the addition of the laser ranging interferometer (LRI) to GRACE-FO, a significant improvement over GRACE for inter-satellite ranging was achieved. One of the limiting factors is the accelerometer for measuring the non-gravitational forces acting on the satellite. The classical electrostatic accelerometers are affected by a drift at low frequencies. This drawback can be counterbalanced by adding an accelerometer based on cold atom interferometry (CAI) due to its high long-term stability. The CAI concept has already been successfully demonstrated in ground experiments and is expected to show an even higher sensitivity in space.In order to investigate the potential of the CAI concept for future satellite gravity missions, a closed-loop simulation is performed in the context of GRACE-FO like missions. The sensitivity of the CAI accelerometer is estimated based on state-of-the-art ground sensors and predictions for space applications. The sensor performance is tested for different scenarios and the benefits to the gravity field solutions are quantitatively evaluated. It is shown that a classical accelerometer aided by CAI technology improves the results of the gravity field recovery especially in reducing the striping effects. The non-gravitational accelerations are modelled using a detailed surface model of a GRACE-like satellite body. This is required for a realistic determination of the variations of the non-gravitational accelerations during one interferometer cycle. It is demonstrated that the estimated error due to this variation is significant. We consider different orbit altitudes and also analyze the effect of drag compensation.

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Kumar Mitra, Rajib, et Dipak Kumar Palit. « Probing Biological Water Using Terahertz Absorption Spectroscopy ». Dans Terahertz Technology [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.97603.

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Hydrogen bonding properties of water molecules, which are confined in microcavities of biological interfaces, are significantly different from those of bulk water and drive most of the complex biological processes. While NMR, X-ray and UV–vis-IR spectroscopic techniques have been found inadequate for describing the dynamics of the thick (20–40 Å) sheath of hydration layer around biomolecules, recently developed THz spectroscopy has emerged as a powerful technique to directly probe the collective dynamics of hydrogen bonds in the hydration layer, which control all important functions of the biomolecules in life. Both laser and accelerator-based THz sources are intense enough to penetrate up to about 100 μm thick water samples, which makes THz transmission and/or dielectric relaxation measurements possible in aqueous solutions. These measurements provide valuable information about the rattling and rotational motions of hydrated ions, making, breaking and rearrangement of hydrogen bonds in hydration layer as well as hydrophilic and hydrophobic interactions between biomolecule and water. THz spectroscopy has also been successfully applied to study the effect of modulation of the physical conditions, like temperature, pH, concentration of proteins and chemical additives, on the structure and dynamics of hydration layer. THz spectroscopy has also been applied to study the processes of denaturation, unfolding and aggregation of biomolecules.

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Actes de conférences sur le sujet "Laser-based ion acceleration"

Thirolf, P. G., D. Habs, M. Gross, K. Allinger, J. Bin, A. Henig, D. Kiefer et al. « Fission-Fusion : A new reaction mechanism for nuclear astrophysics based on laser-ion acceleration ». Dans FRONTIERS IN NUCLEAR STRUCTURE, ASTROPHYSICS, AND REACTIONS : FINUSTAR 3. AIP, 2011. http://dx.doi.org/10.1063/1.3628362.

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Knaak, K. M., K. Wendt et H. J. Kluge. « A Laser Operated Precision DC HV Voltmeter ». Dans The European Conference on Lasers and Electro-Optics. Washington, D.C. : Optica Publishing Group, 1998. http://dx.doi.org/10.1364/cleo_europe.1998.cwc6.

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The precision of HV voltmeters based on voltage dividers is limited by the systematic errors induced by nonlinear currents and resistive drift. Therefore we take a different approach by accelerating ions with the potential to be measured. The resulting fast ion beam is collinearily superposed with a diode laser beam tuned to an optical resonance of the ions. Comparison to a cesium stabilized reference laser yields the absolute laser frequency to within a MHz. Now the accelerating voltage can be determined via the dopplershift of the optical resonance. Thus collinear laser spectroscopy [1] translates the voltage measurement to an absolute determination of an optical frequency.

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Seimetz, M., P. Bellido, F. Sanchez, R. Lera, A. Ruiz-de la Cruz, S. Torres-Peiro, L. Roso et al. « Detailed requirements for a laser-based proton/ion accelerator for radioisotope production ». Dans 2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC). IEEE, 2015. http://dx.doi.org/10.1109/nssmic.2015.7582187.

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Pomerantz, Ishay, Itay Kishon, Annika Kleinschmidt, Victor A. Schanz, Alexandra Tebartz, Juan Carlos Fernández, Donald C. Gautier et al. « Laser-based fast-neutron spectroscopy (Conference Presentation) ». Dans Laser Acceleration of Electrons, Protons, and Ions, sous la direction de Eric Esarey, Carl B. Schroeder et Florian J. Grüner. SPIE, 2017. http://dx.doi.org/10.1117/12.2264955.

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LaBerge, Maxwell, Omid Zarini, Alex H. Lumpkin, Alexander Debus, Andrea Hannasch, Jurjen Couperus Cabadağ, Brant Bowers et al. « Coherent-transition-radiation-based reconstruction of laser plasma accelerated electron bunches ». Dans Laser Acceleration of Electrons, Protons, and Ions VI, sous la direction de Stepan S. Bulanov, Carl B. Schroeder et Jörg Schreiber. SPIE, 2021. http://dx.doi.org/10.1117/12.2592306.

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Spielmann, Christian. « Laser-Plasma-Based Secondary Sources : Accelerating Particles and Light ». Dans Frontiers in Optics. Washington, D.C. : OSA, 2015. http://dx.doi.org/10.1364/fio.2015.fm2a.1.

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Ghebregziabher, I., S. Chen, N. D. Powers, C. M. Maharjan, C. Liu, G. Golovin, S. Banerjee et al. « Bright γ-Ray Beam Source Based on Laser Wakefield Accelerator and Laser Undulator ». Dans Frontiers in Optics. Washington, D.C. : OSA, 2012. http://dx.doi.org/10.1364/fio.2012.fth1b.3.

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Barry, Michael. « Design of Apparatus for Studying Aerodynamics of Voice Production ». Dans ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-61822.

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The design and testing of an experimental apparatus for in vitro study of phonatory aerodynamics (voice production) in humans is presented. The presentation includes not only the details of apparatus design, but flow visualization and Digital Particle Image Velocimetry (DPIV) measurements of the developing flow that occurs during the opening of the constriction from complete closure. The main features of the phonation process have long been understood. A proper combination of air flow from the lungs and of vocal fold tension initiates a vibration of the vocal folds, which in turn valves the airflow. The resulting periodic acceleration of the airstream through the glottis excites the acoustic modes of the vocal tract. It is further understood that the pressure gradient driving glottal flow is related to flow separation on the downstream side of the vocal folds. However, the details of this process and how it may contribute to effects such as aperiodicity of the voice and energy losses in voiced sound production are still not fully grasped. The experimental apparatus described in this paper is designed to address these issues. The apparatus itself consists of a scaled-up duct in which water flows through a constriction whose width is modulated by motion of the duct wall in a manner mimicking vocal fold vibration. Scaling the duct up 10 times and using water as the working fluid allows temporally and spatially resolved measurements of the dynamically similar flow velocity field using DPIV at video standard framing rates (15Hz). Dynamic similarity is ensured by matching the Reynolds number (based on glottal flow speed and glottis width) of 8000, and by varying the Strouhal number (based on vocal fold length, glottal flow speed, and a time scale characterizing the motion of the vocal folds) ranging from 0.01 to 0.1. The walls of the 28 cm × 28 cm test section and the vocal fold pieces are made of clear cast acrylic to allow optical access. The vocal fold pieces are 12.7 cm × 14 cm × 28 cm and are rectangular in shape, except for the surfaces which form the glottis, which are 6.35 cm radius half-circles. Dye injection slots are placed on the upstream side of both vocal field pieces to allow flow visualization. Prescribed motion of the vocal folds is provided by two linear stages. Linear bearings ensure smooth execution of the motion prescribed using a computer interface. Measurements described here use the Laser-Induced Fluorescence (LIF) flow visualization and DPIV techniques and are performed for two Strouhal numbers to assess the effect of opening time on the development of the glottal jet. These measurements are conducted on a plane oriented perpendicular to the glottis, at the duct midplane. LIF measurements use a 5W Argon ion laser to produce a light sheet, which illuminates the dye injected through a slot in each vocal fold piece. Two dye colors are used, one for each side. Quantitative information about the velocity and vorticity fields are obtained through DPIV measurements at the same location as the LIF measurements.

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Zhou, Minchuan, Zifan Zhou, Mohammad Fouda, Jacob Scheuer et Selim M. Shahriar. « Fast-light Enhanced Brillouin Laser Based Active Fiber Optics Sensor for Simultaneous Measurement of Rotation and Acceleration ». Dans Frontiers in Optics. Washington, D.C. : OSA, 2016. http://dx.doi.org/10.1364/fio.2016.ff1b.2.

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Lin, Bin, Harry H. Cheng, Benjamin D. Shaw, Bo Chen et Joe Palen. « Optical and Mechanical Design of a Laser-Based Non-Intrusive Vehicle Delineation Detection System ». Dans ASME 2001 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/detc2001/cie-21668.

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Abstract A field prototype of a laser-based non-intrusive vehicle detection system has been developed for measurement of delineations of moving vehicles on the highway. This prototype is based on our previous research on the principle of the measurement. The detection system uses two laser lines that are projected onto the ground as probes. The reflected light is collected and focused onto a photodiode array by an optical system. Vehicle presence is detected based on the absence of reflected laser light. By placing two identical laser/sensor pairs at a known distance apart, the speed of both the front and rear of a vehicle can be calculated based on the times when each sensor is triggered. The detector data are acquired and processed by a real-time system to obtain speed, acceleration, and length of a detected vehicle. The travel time of a vehicle can be acquired by detecting a vehicle at the beginning of a link and re-identifying the same vehicle at the end of link. Several tests have been done with the field prototype system on the highway. The testing results show that the system can obtain the accuracy of measurement necessary to distinguish between moving vehicles on the highway. This article describes the design and implementation of each functional component of an advanced version of the field prototype system.

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Rapports d'organisations sur le sujet "Laser-based ion acceleration"

Baral, Aniruddha, Jeffery Roesler et Junryu Fu. Early-age Properties of High-volume Fly Ash Concrete Mixes for Pavement : Volume 2. Illinois Center for Transportation, septembre 2021. http://dx.doi.org/10.36501/0197-9191/21-031.

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High-volume fly ash concrete (HVFAC) is more cost-efficient, sustainable, and durable than conventional concrete. This report presents a state-of-the-art review of HVFAC properties and different fly ash characterization methods. The main challenges identified for HVFAC for pavements are its early-age properties such as air entrainment, setting time, and strength gain, which are the focus of this research. Five fly ash sources in Illinois have been repeatedly characterized through x-ray diffraction, x-ray fluorescence, and laser diffraction over time. The fly ash oxide compositions from the same source but different quarterly samples were overall consistent with most variations observed in SO3 and MgO content. The minerals present in various fly ash sources were similar over multiple quarters, with the mineral content varying. The types of carbon present in the fly ash were also characterized through x-ray photoelectron spectroscopy, loss on ignition, and foam index tests. A new computer vision–based digital foam index test was developed to automatically capture and quantify a video of the foam layer for better operator and laboratory reliability. The heat of hydration and setting times of HVFAC mixes for different cement and fly ash sources as well as chemical admixtures were investigated using an isothermal calorimeter. Class C HVFAC mixes had a higher sulfate imbalance than Class F mixes. The addition of chemical admixtures (both PCE- and lignosulfonate-based) delayed the hydration, with the delay higher for the PCE-based admixture. Both micro- and nano-limestone replacement were successful in accelerating the setting times, with nano-limestone being more effective than micro-limestone. A field test section constructed of HVFAC showed the feasibility and importance of using the noncontact ultrasound device to measure the final setting time as well as determine the saw-cutting time. Moreover, field implementation of the maturity method based on wireless thermal sensors demonstrated its viability for early opening strength, and only a few sensors with pavement depth are needed to estimate the field maturity.

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