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Showing 1 to 17 of 17 for “"ablation rate"”.
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Pellet ablation in Tokamak reactors
… cloud model for the simulation of pellet ablation in a Tokamak reactor. We have shown that the ablation rate in the rotational cloud model converges quickly to a steady state value independent of the plasma warmup time. In contrast, the ablation rate in the non-rotating cloud model …
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Ultrashort laser pulse-matter interaction: Fundamentals and early stage plasma dynamics
… comprehensive hydrodynamic model for USLP ablation of metals and semiconductors is developed in this study. The model comprises a two-temperature model and a hydrodynamic model supplemented with a quotidian equation of state model, considering the relevant multiphysical phenomena during the …
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Synthesis and Characterization of Nanocrystalline Niobium Aluminides by Laser Ablation Technique
… of nanocrystalline Nb-aluminides by laser ablation in an ambient gas atmosphere. The goal of this work is to establish the science base for the nanocrystalline synthesis by this method by studying the relationships between processing conditions and physical characteristics of products. …
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Design, modeling and construction of a novel ablative fast pyrolysis reactor and product collection system
… from one module being the input to the next. Separate modules were developed for the determination of the biomass ablation rate, specification of the reactor capacity, cyclone design, quench column design and electrostatic precipitator design. These models enabled a rigorous design protocol to be …
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Examining ablation efficiency in alumina ceramics utilizing femtosecond laser with mhz/ghz burst regime /
… accuracy. Laser processing has been integrated into industrial processes for some time due to its ability to process various materials, including ceramics, while avoiding the drawbacks of mechanical processing. Femtosecond laser processing is a suitable technology for processing hard and …
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Theoretical Study on Magnetic Shielding of an Ablating Solid Hydrogen Pellet in a Plasma and Hydrogen Pellet Production and Injection Into the Apex Tokamak
The ablation rate of a solid hydrogen pellet in a plasma is the critical factor in determining the feasibility of pellet refueling of toroidal magnetically confined thermonuclear reactors. Initial experiments at Oak Ridge National Laboratory involving small pellets (diameter of order 200 (mu)m) and …
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Comparative Investigation of LIBS Spectra and Crater Morphology During Laser Ablation of Eutectic BiSn Alloys
… unknown processes that occur during the laser ablation, the ability to control the resultant thin-film stoichiometry remains a significant challenge. Unfortunately, resolving those problems is hindered by additional critical gaps in our knowledge such as the evolution of the crater morphology, …
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Ablative pyrolysis of biomass
… this work were to design, construct, test and operate a novel ablative pyrolysis reactor and product recovery system. Other key objectives included the development of an ablative pyrolysis reactor design methodology, mathematical modelling of the ablation process and measurement of empirical …
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Ocular biomaterials and the anterior eye
… that could be applied to the eye prior to ablation to create a smooth surface. Factors that may influence ablation rate were explored, Soft contact lenses can be used as a probe to study the interaction between synthetic materials and the biological constituents of tears. This has lead to …
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Production of uniform micropellets of hydrogen and hydrogen pellet injection on ORMAK
… four frames. A model was developed in which the ablation rate of the pellets was regulated by the dynamic formation of a dense shielding cloud surrounding the pellet. The cloud thickness is such that the electrons from the plasma lose most of their energy before striking the pellet surface. The …
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CHAOS: A multi-GPU PIC-DSMC solver for modeling gas and plasma flows
… gases as well as pyrolysis by-products to penetrate in and flow out of the material. Quantifying bulk transport properties of these materials is essential for accurate prediction of the macroscopic ablation rate. The second application that CHAOS is being used with is the modeling of ion …
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Highly Efficient Thermal Ablation of Silicon and Ablation in Other Materials
… Inherent stochastic variations from thermal ablation along with detrimental heat effects, however, limit the feasibility of achieving high precision. The high number of control parameters that make laser micromachining versatile also hinders optimization due to high exploration time. The …
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Lithium pellet injection into high pressure magnetically confined plasmas
The ablation of solid pellets injected into high temperature magnetically confined plasmas is characterized by rapid oscillations in the ablation rate, and the formation of field aligned filaments in the ablatant. High speed imaging of the ablation (> 250, 000 frames/second) during the 2003-2004 …
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DIAGNOSTICS AND REAL-TIME MONITORING OF PULSED LASER ABLATION
… and real-time monitoring during pulsed laser ablation of solid materials are investigated. It is found that acoustic, optical and electric signals generated are closely related to laser processing conditions, material surface and bulk properties. A wide band microphone is used to record …
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BioLaser: Establishing a High-Resolution Laser Ablation Tomography Platform for UK Bioimaging Research
… the type of imaging contrast required to generate useful data. In response to these requirements a novel proof-of-concept ultrafast laser ablation tomography system named “BioLaser” was proposed. A proof-of-concept BioLaser system has been built using an existing ultrafast laser platform as a …
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Microwave Remote Sensing of the Greenland Ice Sheet: Models and Applications
… azimuth angle, spatial gradient, and temporal rate of change. The individual model parameters are discussed in depth with examples using data from the NASA Scatterometer (NSCAT) and from the ERS. The model may be applied for increased accuracy in scatterometer, SAR, and wide-angle SAR studies. …
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Interaction Between a High Density-Low Temperature Plasma and a Frozen Hydrogen Pellet in a Railgun Injector
Made available in DSpace on 2017-07-06T18:48:16Z (GMT). No. of bitstreams: 3 Grapperhaus_Michael_J_MS.pdf: 45697939 bytes, checksum: d3a56621b6f53381ba45ac0e8453ed77 (MD5) Grapperhaus_Michael_J_MS_ABS.pdf: 460664 bytes, checksum: 47d9b30f2141b65647b9fa3241f13603 (MD5) license.txt: 4813 bytes, …