Beam-plasma dielectric tensor with Mathematica

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• 作者：A. Bret
• 关键词：Plasma physics ; Dielectric tensor ; Fluid equations ; Instabilities
• 刊名：Computer Physics Communications
• 出版年：2007
• 期刊代码：30_00104655
• 类别：cp
• 出版时间：1 March 2007
• 卷：176
• 期：5
• 页码：362-366
• 文件大小：131 K

摘要

We present a Mathematica notebook allowing for the symbolic calculation of the f="/science?_ob=MathURL&_method=retrieve&_udi=B6TJ5-4MSHTG1-1&_mathId=mml1&_user=10&_cdi=5301&_rdoc=5&_acct=C000050221&_version=1&_userid=10&md5=6b7ffa25f14c14ca2330345c1aa474df" title="Click to view the MathML source">3×3 dielectric tensor of an electron-beam plasma system in the fluid approximation. Calculation is detailed for a cold relativistic electron beam entering a cold magnetized plasma, and for arbitrarily oriented wave vectors. We show how one can elaborate on this example to account for temperatures, arbitrarily oriented magnetic field or a different kind of plasma.

Program summary

Title of program: Tensor

Catalog identifier: ADYT_v1_0

Program summary URL: http://cpc.cs.qub.ac.uk/summaries/ADYT_v1_0

Program obtainable from: CPC Program Library, Queen's University of Belfast, N. Ireland

Computer for which the program is designed and others on which it has been tested: Computers: Any computer running Mathematica 4.1. Tested on DELL Dimension 5100 and IBM ThinkPad T42. Installations: ETSI Industriales, Universidad Castilla la Mancha, Ciudad Real, Spain

Operating system under which the program has been tested: Windows XP Pro

Programming language used: Mathematica 4.1

Memory required to execute with typical data: 7.17 Mbytes

No. of bytes in distributed program, including test data, etc.: 33 439

No. of lines in distributed program, including test data, etc.: 3169

Distribution format: tar.gz

Nature of the physical problem: The dielectric tensor of a relativistic beam plasma system may be quite involved to calculate symbolically when considering a magnetized plasma, kinetic pressure, collisions between species, and so on. The present Mathematica notebook performs the symbolic computation in terms of some usual dimensionless variables.

Method of solution: The linearized relativistic fluid equations are directly entered and solved by Mathematica to express the first-order expression of the current. This expression is then introduced into a combination of Faraday and Ampère–Maxwell's equations to give the dielectric tensor. Some additional manipulations are needed to express the result in terms of the dimensionless variables.

Restrictions on the complexity of the problem: Temperature effects are limited to small, i.e. non-relativistic, temperatures. The kinetic counterpart of the present Mathematica will usually not compute the required integrals.

Typical running time: About 1 minute on a Intel Centrino 1.5 GHz Laptop with 512 MB of RAM.

Unusual features of the program: None.