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Relevant bibliographies by topics / OPTICALLY THICK PLASMA

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Academic literature on the topic 'OPTICALLY THICK PLASMA'

Author: Grafiati

Published: 4 June 2021

Last updated: 15 February 2022

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Journal articles on the topic "OPTICALLY THICK PLASMA"

1

Mahdavi, M., T. Koohrokhi, and Z. Barfami. "The Effect of Energy Leakage Probability on Burn Propagation in an Optically Thick Fusion Plasma." ISRN High Energy Physics 2012 (2012): 1–10. http://dx.doi.org/10.5402/2012/838394.

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In an optically thick plasma, the mean free path of bremsstrahlung photons is smaller than the plasma radius, and radiation can be treated as a photon gas in thermal equilibrium. In these conditions, the black body radiation spectrum exceeds the number of hot photons, and reabsorption processes such as inverse bremsstrahlung radiation and inverse Compton scattering become important. It has been shown that a dense fusion plasma like the one being used in ICF method is initially optically thick. When the fuel pellet is burning, the temperature of its electrons rises (approximately greater than 90 KeV), and the pellet becomes rapidly optically thin. In this paper, we have shown that the energy leakage probability makes electron temperature remain low (approximately smaller than 55 KeV), and as a result the fuel pellet remains optically thick during burning.

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Rodger, A. S., and N. Labrosse. "Spectral gradient of the thermal millimetre continuum as a diagnostic for optical thickness in the solar atmosphere." Astronomy & Astrophysics 617 (September 2018): L6. http://dx.doi.org/10.1051/0004-6361/201833848.

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Aims. In this Letter we aim to show how the gradient of the thermal millimetre continuum spectrum, as emitted from the quiet solar atmosphere, may be used as a diagnostic for the optical thickness regime at the centre of the observing frequency band. Methods. We show the theoretical derivation of the gradient of the millimetre continuum for both logarithmic- and linear-scale spectra. We compare this expression with the empirical relationship between the slope of the millimetre continuum spectrum and the plasma optical thickness computed from both isothermal and multi-thermal two-dimensional cylindrical radiative transfer models. Results. It is found that the logarithmic-scale spectral gradient provides a clear diagnostic for the optical thickness regime for both isothermal and multi-thermal plasmas, provided that a suitable correction is made for a non-constant gaunt factor over the frequency band. For the use of observers we present values for this correction at all ALMA bands and at a wide range of electron temperatures. Conclusions. We find that the spectral gradient can be used to find (a) whether the source is fully optically thin, (b) the optical thickness of the source if it lies within the transitional regime between optically thin and thick plasma (τ ≈ 10−1−101), or (c) whether the source is fully optically thick for an isothermal plasma. A multi-thermal plasma will act the same as an isothermal plasma for case (a), however, the transitional regime will only extend from τ ≈ 10−1 to τ ≈ 100. Above τ = 1 the slope of the continuum will depend increasingly on the temperature gradient, as well as the optical thickness, reducing the reliability of the diagnostic.

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Bakshi, V., and W. C. Nunnally. "Measurement of temperatures in optically thick railgun plasma armatures." IEEE Transactions on Magnetics 31, no. 1 (January 1995): 673–77. http://dx.doi.org/10.1109/20.364613.

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4

Shikhovtseva, E. S. "Equilibrium x-ray emission of an optically thick plasma." Astrophysics 28, no. 3 (1988): 392–99. http://dx.doi.org/10.1007/bf01112979.

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5

Zhen, Zhiqiang, and Jian He. "Opacity of Krypton X-ray lines in high-temperature plasma implosion." Modern Physics Letters B 33, no. 33 (November 30, 2019): 1950418. http://dx.doi.org/10.1142/s0217984919504189.

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For accurate electron temperature and density diagnostics in laser high-temperature plasma implosion, opacity of Krypton (Kr) helium-[Formula: see text] and Balmer-[Formula: see text] lines are discussed, and ratio of escape factor of the two X-rays are calculated, both for Gaussian and Holtzmarkian profiles. Finally, the line ratios of the two X-ray lines are analyzed for optically thin and thick plasmas. Results indicate that for the Gaussian profile, the line ratio varies greatly with the opacity of the Kr helium-[Formula: see text] line, which provides excellent source for temperature and electron density diagnostics; while for the Holtzmarkian profile, the line ratio varies less with the opacity of the Kr helium-[Formula: see text] line, which can be used for escape factor diagnostics. This method is significant in accurate plasma diagnostics using X-rays under the condition of optically thick.

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Pawelec, E., V. Caubet-Hilloutou, and S. Mazouffre. "Fabry–Pérot lineshape analysis in an optically thick expanding plasma." Plasma Sources Science and Technology 16, no. 3 (August 1, 2007): 635–42. http://dx.doi.org/10.1088/0963-0252/16/3/024.

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Orlov, N. Yu, S. Yu Gus'kov, S. A. Pikuz, V. B. Rozanov, T. A. Shelkovenko, N. V. Zmitrenko, and D. A. Hammer. "Theoretical and experimental studies of the radiative properties of hot dense matter for optimizing soft X-ray sources." Laser and Particle Beams 25, no. 3 (July 20, 2007): 415–23. http://dx.doi.org/10.1017/s0263034607000535.

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Theoretical and experimental studies of radiative properties of hot dense plasmas that are used as soft X-ray sources have been carried out depending on the plasma composition. Important features of the theoretical model, which can be used for complex materials, are discussed. An optimizing procedure that can determine an effective complex material to produce optically thick plasma by laser interaction with a thick solid target is applied. The efficiency of the resulting material is compared with the efficiency of other composite materials that have previously been evaluated theoretically. It is shown that the optimizing procedure does, in practice, find higher radiation efficiency materials than have been found by previous authors. Similar theoretical research is performed for the optically thin plasma produced from exploding wires. Theoretical estimations of radiative efficiency are compared with experimental data that are obtained from measurements of X-pinch radiation energy yield using two exploding wire materials, NiCr and Alloy 188. It is shown that theoretical calculations agree well with the experimental data.

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SAWADA, Keiji, Yusuke YAMADA, Takamasa MIYACHIKA, Naomichi EZUMI, Atsushi IWAMAE, and Motoshi GOTO. "Collisional-Radiative Model for Spectroscopic Diagnostic of Optically Thick Helium Plasma." Plasma and Fusion Research 5 (2010): 001. http://dx.doi.org/10.1585/pfr.5.001.

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9

Karabourniotis, D., E. Drakakis, and B. Zacharopoulos. "Electron and population temperatures in a non-LTE optically thick plasma." Journal of Physics D: Applied Physics 25, no. 2 (February 14, 1992): 188–94. http://dx.doi.org/10.1088/0022-3727/25/2/009.

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Liao, Lamei, and Jian He. "Discussion on laser-induced plasma diagnostics under condition of optically thick." Optik 127, no. 11 (June 2016): 4878–80. http://dx.doi.org/10.1016/j.ijleo.2016.02.037.

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Dissertations / Theses on the topic "OPTICALLY THICK PLASMA"

1

Fischbacher, Gordon Anderson. "Diagnosis and modelling of optically thick structures in the lower solar atmosphere." Thesis, University of Strathclyde, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366870.

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Patel, Pravesh K. "X-ray line transfer in rapidly expanding laser-produced plasmas." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298648.

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Book chapters on the topic "OPTICALLY THICK PLASMA"

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Rebetzky, A., H. Herold, T. Maile, H. Ruder, and K. Wolf. "Radiative transfer in optically thick plasmas of accretion columns." In Timing Neutron Stars, 743–47. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-2273-0_59.

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ARKHANGELSKAJA, I. V., and I. E. PANCHENKO. "MODELING GRBs SPECTRA BY OPTICALLY THICK EXPANDING PLASMA SHELLS." In The Ninth Marcel Grossmann Meeting, 2463–64. World Scientific Publishing Company, 2002. http://dx.doi.org/10.1142/9789812777386_0613.

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Rezaei, Fatemeh. "Optically Thick Laser-Induced Plasmas in Spectroscopic Analysis." In Plasma Science and Technology - Progress in Physical States and Chemical Reactions. InTech, 2016. http://dx.doi.org/10.5772/61941.

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4

"Numerical Validation of a Self Absorption Model for Optically Thick Plasmas." In Light Sources 2004 Proceedings of the 10th International Symposium on the Science and Technology of Light Sources, 659. CRC Press, 2004. http://dx.doi.org/10.1201/9781482269178-246.

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Conference papers on the topic "OPTICALLY THICK PLASMA"

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Gornushkin, Igor, C. L. Stevenson, B. W. Smith, N. Omenetto, and J. D. Winefordner. "Semiempirical model of an optically thick laser induced plasma." In Laser Induced Plasma Spectroscopy and Applications. Washington, D.C.: OSA, 2002. http://dx.doi.org/10.1364/libs.2002.thc4.

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Sharma, S., D. L. Sutar, R. K. Pensia, and A. Patidar. "Effect of electron inertia on radiative instability of optically thick plasma." In PROF. DINESH VARSHNEY MEMORIAL NATIONAL CONFERENCE ON PHYSICS AND CHEMISTRY OF MATERIALS: NCPCM 2018. Author(s), 2019. http://dx.doi.org/10.1063/1.5098559.

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Kaneko, Tsuyoshi, Satoshi Nomura, Kimiya Komurasaki, and Hiroyuki Koizumi. "Laser Induced Fluorescence Combined with Laser Absorption Spectroscopy for Optically Thick Plasma Diagnostics." In 28th Aerodynamic Measurement Technology, Ground Testing, and Flight Testing Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2012. http://dx.doi.org/10.2514/6.2012-2653.

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Pensia, R. K., D. L. Sutar, and S. Sharma. "Analysis of Jeans instability of optically thick quantum plasma under the effect of modified Ohms law." In 2ND INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC 2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5032775.

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Kumar, A., and R. K. Pensia. "Effect of rotation on gravitational instability of optically thick magnetized quantum plasma in the presence of radiation." In 2ND INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC 2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5033236.

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Sako, Masao. "X-ray Line Emission from Optically-Thick Astrophysical Media." In ATOMIC PROCESSES IN PLASMAS: 14th APS Topical Conference on Atomic Processes in Plasmas. AIP, 2004. http://dx.doi.org/10.1063/1.1824863.

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7

Morvan, D., F. Krayem, S. Magnaval, S. F. Miralai, J. Amouroux, D. Ballutaud, S. Dresvin, and S. Nguen Kuok Shy. "Deposition of Thick Silicon Layers Using a Radio-Frequency Thermal Plasma." In ITSC 1998, edited by Christian Coddet. ASM International, 1998. http://dx.doi.org/10.31399/asm.cp.itsc1998p0511.

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Abstract RF Ar-H2 plasma spraying of metallurgical grade silicon particles (80-125 µm) was used in order to combine the purification and the deposition process of silicon particles with a high deposition rate (300 - 600 µm). The hydrogen and oxygen content of the plasma gas turned out to be of a great importance to purify metallurgical silicon powders. The whole process was investigated through ex-situ characterisation of the deposits and on-line diagnostics of the plasma which results matched quite well with the mathematical modelling. The deposits were characterised using SEM, EDX analysis, SIMS, XPS in order to explain the composition and overall properties of the layers in view of their use in photovoltaic applications. Characterisation of silicon deposits was completed by the hydrogen rate analysis using exodiffusion method. Hydrogen trapping in plasma sprayed deposits was found in order of 1019 at/cm3. The oxygen contained in the original powders (30%) was decreased down to 3 - 5% in the deposits. Finally, the on-line diagnostics of the plasma used was : Laser Doppler Anemometry (LDA), Laser Doppler Granulometry (LDG) and Optical Emission Spectroscopy (OES). The mean velocity and surface temperature of particles was found to be in agreement with modelling results.

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Wright, R. N., and W. D. Swank. "Microstructure Effects on Stainless Steel Substrates from Deposition of Plasma Spray Coatings." In ITSC 2000, edited by Christopher C. Berndt. ASM International, 2000. http://dx.doi.org/10.31399/asm.cp.itsc2000p0423.

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Abstract Cold work and heat treatment influence the mechanical properties, residual stress-state, and corrosion resistance of austenitic stainless steels. In this study we have examined changes in the defect substructure and microstructure of Type 304 stainless steel resulting from surface preparation, and deposition of bond coats and thick ceramic coatings using plasma spray methods. The structure of the stainless steel was examined as a function of depth from the coating surface using optical and transmission electron microscopy, and x-ray diffraction. Grit blasting was found to severely cold work the material to a depth of tens of microns, and the amount of cold work varied with measured abrasive particle velocity. The heat input to the surface as a result of depositing a metallic bond coat or thick ceramic coating resulted in substantial annealing of the cold work imparted into the substrate by surface preparation. There was, however, no evidence of change in grain size near the substrate-coating interface that could be attributed to recrystallization or grain growth in the substrate.

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Aryasomayajula, Aditya, Mohit Kumar Gupta, and Santhosh Kumar Janarthanaam. "Studies on Tantalum Nitride (TaN) Hard Coatings on Turning Tools by DC Magnetron Sputtering Technique." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-80176.

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Tantalum nitride (TaN) thin films were coated at room temperature (30°C) on carbide turning inserts using DC magnetron sputtering technique. The mechanical properties like adhesion and hardness of these coating have been evaluated by Scratch tester; the thickness is estimated by Ball and Crater method. The properties of the films are studied by X-Ray diffraction (XRD) technique. The Optical Emission Spectroscopy (OES) has been employed to analyze the sputtering plasma to understand the reaction kinetics of tantalum nitride formation. The surface of the substrates: tools, glass and single crystal silicon, has been treated with plasma for better adhesion. A 2 μm thick TaN was deposited on the turning inserts. The coated inserts withstood a load of 20 N. The preliminary results reported are quite encouraging.

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Lu, Jian, Xiao-Wu Ni, and Anzhi He. "Equal-thick-fringe F-P interferometer for the high-speed interference recording of laser plasma at the initial stage." In SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, edited by Ryszard J. Pryputniewicz, Gordon M. Brown, and Werner P. O. Jueptner. SPIE, 1995. http://dx.doi.org/10.1117/12.212644.

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