翻訳と辞書 Words near each other ・ Plasma frozen within 24 hours ・ Plasma fusion preface ・ Plasma gasification ・ Plasma gasification commercialization ・ Plasma globe ・ Plasma kallikrein ・ Plasma lamp ・ Plasma medicine ・ Plasma membrane Ca2+ ATPase ・ Plasma membrane monoamine transporter ・ Plasma membrane transformation ・ Plasma modeling ・ Plasma needling ・ Plasma oscillation ・ Plasma osmolality ・ Plasma parameter ・ Plasma parameters ・ Plasma pencil ・ Plasma Physics Laboratory (Saskatchewan) ・ Plasma polymerization ・ Plasma Pong ・ Plasma Pool ・ Plasma processing ・ Plasma propulsion engine ・ Plasma protein binding ・ Plasma railgun ・ Plasma receiver ・ Plasma recombination ・ Plasma Records ・ Plasma renin activity Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Plasma parameter ： ウィキペディア英語版 Plasma parameter The ''plasma parameter'' is a dimensionless number, denoted by capital Lambda, Λ. The plasma parameter is usually interpreted to be the argument of the Coulomb logarithm, which is the ratio of the maximum impact parameter to the classical distance of closest approach in Coulomb scattering. In this case, the plasma parameter is given by:〔Chen, F.F., Introduction to Plasma Physics and Controlled Fusion, (Springer, New York, 2006)〕 :$\backslash Lambda\; =\; 4\backslash pi\; n\; \backslash lambda\_D^3$ where :''n'' is the number density of electrons, :λD is the Debye length. This expression is typically valid for a plasma in which ion thermal velocities are much less than electron thermal velocities. A detailed discussion of the Coulomb logarithm is available in the ''NRL Plasma Formulary'', pages 34–35. Note that the word parameter is usually used in plasma physics to refer to bulk plasma properties in general: see plasma parameters. An alternative definition of this parameter is given by the average number of electrons in a plasma contained within a Debye sphere (a sphere of radius the Debye length). This definition of the plasma parameter is more frequently (and appropriately) called the Debye number, and is denoted $N\_D$. In this context, the plasma parameter is defined as :$N\_D\; =\; \backslash frac\; n\; \backslash lambda\_D^3$ Since these two definitions differ only by a factor of three, they are frequently used interchangeably. Often the factor of $4\backslash pi/3$ is dropped. When the Debye length is given by $\backslash lambda\_D\; =\; \backslash sqrt\}$, the plasma parameter is given by〔Miyamoto, K., Fundamentals of Plasma Physics and Controlled Fusion, (Iwanami, Tokyo, 1997)〕 :$N\_D\; =\; \backslash frac\}$ where : ε0 is the permittivity of free space, : ''k'' is Boltzmann's constant, : ''q''''e'' is the electron charge, : ''Te''is the electron temperature. Confusingly, some authors define the plasma parameter as : :$\backslash epsilon\_p\; =\; \backslash Lambda^\backslash$. == Coupling parameter == A closely related parameter is the plasma coupling $\backslash Gamma$, defined as a ratio of the Coulomb energy to the thermal one: :$\backslash Gamma\; =\; \backslash frac$. The Coulomb energy (per particle) is :$E\_\backslash mathrm\; =\; \backslash frac$, where for the typical inter-particle distance $\backslash langle\; r\; \backslash rangle$ usually is taken the Wigner-Seitz radius. Therefore, :$\backslash Gamma\; =\; \backslash frac\backslash sqrt()\}$. Clearly, up to a numeric factor of the order of unity, :$\backslash Gamma\; \backslash sim\; \backslash Lambda^\backslash$. In general, for multicomponent plasmas one defines the coupling parameter for each species ''s'' separately: :$\backslash Gamma\_s\; =\; \backslash frac\backslash sqrt()\}$. Here, ''s'' stands for either electrons or (a type of) ions. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Plasma parameter」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.