scholarly journals Peculiar properties of the electron beam dynamics simulation by particle-particle methods taking into account delay effects

2019 ◽  
Vol 30 ◽  
pp. 09005
Author(s):  
Sergey Alikov ◽  
Alexandr Shein
Keyword(s):  
Electron Beam ◽  
Simulation Method ◽  
Interaction Space ◽  
Beam Dynamics ◽  
Particle Simulation ◽  
Dynamics Simulation ◽  
Particle Methods ◽  
Particle Simulation Method ◽  
Beam Dynamics Simulation ◽  
Electron Beam Dynamics

An analysis of the plane influence separating the interaction space from the electron beam-forming region is made by the particle-particle simulation method with the delay effect. During the simulation, it was shown that the boundary conditions on the surface have a significant effect on the electron beam dynamics in a longitudinal magnetic field and affect the time of formation of the virtual cathode and the particle velocity in the interaction space.

Variance Reduction in Particle Methods for Solving the Boltzmann Equation

2006 ◽  
Author(s):  
Lowell L. Baker ◽  
Nicolas G. Hadjiconstantinou
Keyword(s):  
Boltzmann Equation ◽  
Shear Flow ◽  
Variance Reduction ◽  
Simulation Method ◽  
Reduction Technique ◽  
Particle Simulation ◽  
Time Dependent ◽  
Particle Methods ◽  
The Boltzmann Equation ◽  
Particle Simulation Method

We present a new particle scheme for solving the Boltzmann equation; this scheme incorporates a recently developed variance reduction technique discussed in [L. L. Baker and N. G. Hadjiconstantinou, Physics of Fluids, vol. 17, art. no 051703, 2005] which exhibits a significant computational efficiency advantage for low speed flows, compared to traditional particle methods. This paper describes how this variance reduction approach, achieved by simulating only the deviation from equilibrium, can be implemented as a particle simulation method. The new scheme is validated using time dependent shear flow calculations.

Thermo-mechanical coupling particle simulation of three-dimensional large-scale non-isothermal problems

2017 ◽  
Vol 34 (5) ◽  
pp. 1551-1571 ◽  
Author(s):  
Ming Xia
Keyword(s):  
Large Scale ◽  
Three Dimensional ◽  
Simulation Method ◽  
Particle Simulation ◽  
Similarity Criteria ◽  
Particle Model ◽  
Length Scale ◽  
Content Type ◽  
Mechanical Coupling ◽  
Particle Simulation Method

Purpose The main purpose of this paper is to present a comprehensive upscale theory of the thermo-mechanical coupling particle simulation for three-dimensional (3D) large-scale non-isothermal problems, so that a small 3D length-scale particle model can exactly reproduce the same mechanical and thermal results with that of a large 3D length-scale one. Design/methodology/approach The objective is achieved by following the scaling methodology proposed by Feng and Owen (2014). Findings After four basic physical quantities and their similarity-ratios are chosen, the derived quantities and its similarity-ratios can be derived from its dimensions. As the proposed comprehensive 3D upscale theory contains five similarity criteria, it reveals the intrinsic relationship between the particle-simulation solution obtained from a small 3D length-scale (e.g. a laboratory length-scale) model and that obtained from a large 3D length-scale (e.g. a geological length-scale) one. The scale invariance of the 3D interaction law in the thermo-mechanical coupled particle model is examined. The proposed 3D upscale theory is tested through two typical examples. Finally, a practical application example of 3D transient heat flow in a solid with constant heat flux is given to illustrate the performance of the proposed 3D upscale theory in the thermo-mechanical coupling particle simulation of 3D large-scale non-isothermal problems. Both the benchmark tests and application example are provided to demonstrate the correctness and usefulness of the proposed 3D upscale theory for simulating 3D non-isothermal problems using the particle simulation method. Originality/value The paper provides some important theoretical guidance to modeling 3D large-scale non-isothermal problems at both the engineering length-scale (i.e. the meter-scale) and the geological length-scale (i.e. the kilometer-scale) using the particle simulation method directly.

Electron beam dynamics in an ultrafast transmission electron microscope with Wehnelt electrode

2016 ◽  
Vol 171 ◽  
pp. 8-18 ◽  
Author(s):  
K. Bücker ◽  
M. Picher ◽  
O. Crégut ◽  
T. LaGrange ◽  
B.W. Reed ◽  
...  
Keyword(s):  
Electron Beam ◽  
Electron Microscope ◽  
Transmission Electron Microscope ◽  
Beam Dynamics ◽  
Transmission Electron ◽  
Electron Beam Dynamics
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