Computer simulations of absorption and scattering

1986 ◽  
Vol 64 (8) ◽  
pp. 993-997 ◽  
Author(s):  
A. Bruce Langdon
Keyword(s):  
Computer Simulation ◽  
Mathematical Modelling ◽  
Computer Simulations ◽  
Laser Light ◽  
Inertial Confinement ◽  
Particle In Cell ◽  
Cell Simulation ◽  
External Sources ◽  
Principal Tool ◽  
Current Densities

This paper discusses computer simulation of absorption and scattering of laser light, under conditions relevant to laboratory achievement of thermonuclear fusion by laser-driven inertial-confinement methods. We enumerate the principal absorption and scattering processes and their requirements for accurate mathematical modelling. The principal tool, so-called particle-in-cell simulation, tracks particles through electromagnetic fields calculated self-consistently from the charge and current densities of the particles themselves, external sources, and boundaries. Many references are given. Special attention is given to two-plasmon decay.

scholarly journals Transformation of Gear Inter-Teeth Forces into Acceleration and Velocity

1999 ◽  
Vol 5 (3) ◽  
pp. 203-218 ◽  
Author(s):  
Walter Bartelmus
Keyword(s):  
Computer Simulation ◽  
Mathematical Modelling ◽  
Computer Simulations ◽  
Production Technology ◽  
Vibration Acceleration ◽  
Acceleration Signal ◽  
Field Practice ◽  
Design Production ◽  
Extended Interpretation

The paper deals with mathematical modelling and computer simulation of a gearbox system. Results of computer simulation show new possibilities of extended interpretation of a diagnostic acceleration signal if signal is obtained by synchronous summation. Four groups of factors: design, production technology, operation, change of gear condition are discussed. Results of computer simulations give the relation between inter-teeth forces and vibration (acceleration, velocity). Some results of computer simulations are referred to the results obtained in rig measurements and in field practice. The paper shows a way of increasing the expert's knowledge on the diagnostic signal, which is generated by a gearbox system, on a base of mathematical modelling and computer simulation.

scholarly journals Modeling of Planar Plasma Diode

2013 ◽  
Vol 13 ◽  
pp. 220-242
Author(s):  
K.A.I.L. Wijewardena Gamalath ◽  
A.M. Samarakoon
Keyword(s):  
Electric Fields ◽  
Current Density ◽  
Plasma Boundary ◽  
Particle In Cell ◽  
External Electric Fields ◽  
Cell Simulation ◽  
Planar Plasma ◽  
Plasma Diode ◽  
Current Densities ◽  
Diode System

To investigate the dynamics of a planar plasma diode system (PDS), a model based on the current density equilibrium at the interface was developed. The current densities and plasma boundary variations with the potential fields were obtained by simulating a single square pulse. The variation of an observed overshoot current density with the applied voltage is presented. Planar plasma diode system was also simulated for periodic, sine, square, triangular and saw tooth voltage patterns by varying the amplitude and frequencies. A method to find the lower bound of the electron density of plasma for a specified PDS is presented. Particle-In-Cell simulation technique was used to investigate the plasma particles and electric field distributions over the anode cathode gap for different intensities of external electric fields. The system became stable after few time steps and this time depends upon the intensity and polarization of the external field.

scholarly journals Trapping of electromagnetic radiation in self-generated and preformed cavities

2013 ◽  
Vol 31 (4) ◽  
pp. 589-595 ◽  
Author(s):  
Shixia Luan ◽  
Wei Yu ◽  
Jingwei Wang ◽  
Mingyang Yu ◽  
Suming Weng ◽  
...  
Keyword(s):  
Laser Light ◽  
Ponderomotive Force ◽  
Light Trapping ◽  
Critical Density ◽  
Half Cycle ◽  
Particle In Cell ◽  
Peak Structure ◽  
Cell Simulation ◽  
Overdense Plasma ◽  
Vacuum Cavity

AbstractLaser light trapping in cavities in near-critical density plasmas is studied by two-dimensional particle-in-cell simulation. The laser ponderomotive force can create in the plasma a vacuum cavity bounded by a thin overcritical-density wall. The laser light is self-consistently trapped as a half-cycle electromagnetic wave in the form of an oscillon-caviton structure until it is slowly depleted through interaction with the cavity wall. When the near-critical density plasma contains a preformed cavity, laser light can become a standing wave in the latter. The trapped light is characterized as multi-peak structure. The overdense plasma wall around the self-generated and preformed cavities induced by the laser ponderomotive force is found to be crucial for pulse trapping. Once this wall forms, the trapped pulse can hardly penetrate.

Particle-In-Cell Simulation for Breakdown Phenomena in Vacuum

2020 ◽  
Vol 140 (6) ◽  
pp. 318-324
Author(s):  
Haruki Ejiri ◽  
Takashi Fujii ◽  
Akiko Kumada ◽  
Kunihiko Hidaka
Keyword(s):  
Particle In Cell ◽  
Cell Simulation

A Computer Simulation Approach for Engineering Air-Jet Spun Yarns

1997 ◽  
Vol 67 (3) ◽  
pp. 223-230 ◽  
Author(s):  
Rangaswamy Rajamanickam ◽  
Steven M. Hansen ◽  
Sundaresan Jayaraman
Keyword(s):  
Computer Simulation ◽  
Computer Simulations ◽  
Fiber Length ◽  
Experimental Investigations ◽  
Simulation Approach ◽  
Air Jet ◽  
Fiber Fineness ◽  
Spun Yarns ◽  
Yarn Count ◽  
Wrap Angle

A computer simulation approach for engineering air-jet spun yarns is proposed, and the advantages of computer simulations over experimental investigations and stand-alone mathematical models are discussed. Interactions of the following factors in air-jet spun yarns are analyzed using computer simulations: yarn count and fiber fineness, fiber tenacity and fiber friction, fiber length and fiber friction, and number of wrapper fibers and wrap angle. Based on the results of these simulations, yarn engineering approaches to optimize strength are suggested.

scholarly journals A generalized weight-based particle-in-cell simulation scheme

2011 ◽  
Vol 182 (3) ◽  
pp. 564-569 ◽  
Author(s):  
W.W. Lee ◽  
T.G. Jenkins ◽  
S. Ethier
Keyword(s):  
Particle In Cell ◽  
Cell Simulation ◽  
Simulation Scheme
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