Effective Electromagnetic Media for FDTD-PIC
(0) Simulation and modelling using Finite Difference-Time Domain Particle-in-Cell (FDTD-PIC) techniques often requires the utilization of various electromagnetic field-material response properties to provide high-fidelity results. The various property models available have practical limitations, particularly when employed in problems which require the participation of ambient plasmas. The authors discuss some of the techniques and issues that must be addressed in obtaining robust simulations suitable for engineering design and demonstration while faithfully enforcing physical principles. Simulations are used to provide insight into physical processes and guide the design and development of a variety of technologies. Historically, this approach has been applied in the domain of vacuum electronic devices; however, the methodology spans a much broader range of applications, which includes areas such as: bio-electric effects, bio-medical, radar cross sections, and high power microwave devices. The trademarked ATK software package, commercially known as the MAGIC Tool Suite, is a widely used FDTD-PIC software suite. The basic approach for FDTD-PIC is well known and the literature contains the basic equations and descriptions for the solution of Maxwells equations. The FDTD method is very attractive because of its computational efficiency and relative ease of implementation. As is well known, two of the principle challenges to the correct modelling of any electromagnetic field-material interaction lie in (1) the adequate representation of the model boundary conditions (BC), and (2) the representation of dynamic or frequency dependent material properties. Simple BC idealizations, such as the perfect conductor, the periodic, or mirror symmetric boundaries are readily treated. However, the open boundary termination is one which many researchers have devoted enormous amounts of energy in perfecting. The basic issue is the completion of the simulation domain with a one-sided wave equation. There are in fact two complementary aspects that are of value in MAGIC. These are the scattered wave component and the incident wave component. In addition, there is the issue of modelling interior domains with permittivity and conductivity. Simulations are widely used and often misused. Novice users of this approach often fail to understand fundamental issues and constraints in the application of the various models and how they may interact. In this paper, the authors will address some of the FDTD-PIC constraints associated with the following algorithms: · The use of interior electric and magnetic conductivity models for representing effective absorbers and mimicking Field Effect Transistors (FETs). · Conductor surface loss models and the side effects. · Matched Phase Velocity method for bounding a domain and the introduction of an electro-magnetic pulse into the interior. · The optimized free space impedance matching method, or the lazy mans version of PML What are its advantages and disadvantages? · The use of the Convolutional Perfectly Matched Layer (CPML) method and the caveats when applied to non-plasma free problems.
Lars D.Ludeking Andrew J.Woods
ATK-Mission Systems Group,Newington,Va 22122,USA
国际会议
Progress in Electromagnetics Research Symposium 2009(2009年电磁学研究新进展学术研讨会)(PIERS 2009)
北京
英文
1647-1651
2009-03-23（万方平台首次上网日期，不代表论文的发表时间）