An Introduction to the Linear Theories and Methods of by W. D. Jones, H. J. Doucet, J. M. Buzzi (auth.)

By W. D. Jones, H. J. Doucet, J. M. Buzzi (auth.)

Modern plasma physics, encompassing wave-particle interactions and collec­ tive phenomena attribute of the collision-free nature of scorching plasmas, was once based in 1946 whilst 1. D. Landau released his research of linear (small­ amplitude) waves in such plasmas. It used to be now not until eventually a few ten to 20 years later, even if, with impetus from the then quickly constructing managed­ fusion box, that adequate recognition used to be dedicated, in either theoretical and experimental study, to explain the significance and ramifications of Landau's unique paintings. in view that then, with advances in laboratory, fusion, house, and astrophysical plasma examine, we've witnessed vital devel­ opments towards the certainty of various linear in addition to nonlinear plasma phenomena, together with plasma turbulence. this present day, plasma physics stands as a well-developed self-discipline containing a unified physique of robust theoretical and experimental suggestions and together with a variety of appli­ cations. As such, it truly is now usually brought in college physics and engineering curricula on the senior and first-year-graduate degrees. an important prerequisite for all of recent plasma stories is the below­ status oflinear waves in a temporally and spatially dispersive medium equivalent to a plasma, together with the kinetic (Landau) thought description of such waves. educating adventure has frequently proven that scholars (seniors and first-year graduates), whilst first uncovered to the kinetic idea of plasma waves, have problems in facing the necessary sophistication in multidimensional complicated variable (singular) integrals and transforms.

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Extra resources for An Introduction to the Linear Theories and Methods of Electrostatic Waves in Plasmas

Example text

Although all derived from the same formal Hilbert transform, are not the same function. - (z) are analytic in the upper and lower complex-z planes, respectively. 136) Integration of Eq. + = f+oo ~du. ± (z) when Im(z) ~ O. 138) lim Q- (z) = QO(z) - i1t

L. 73), and as we will show in the next section is due to the loss of the transient motion in Eq. (1. 73). Our conclusion is that, in contrast to a Fourier transform in time, a Laplace transform in time yields to causal solutions of linear differential equations describing nondissipative systems. 2. Causality and Transient Motion In this section, we will show more precisely how causality is related to the transient motion in a nondissipative system. Let us consider Eq. 64) again, which is the causal solution of the differential equation, Eq.

We see that these equations are linear with respect to the various fields, and that neither the space coordinate r(x,y,z) nor time t appears explicitly in these equations. Thus, we can use Fourier and Laplace transforms in space and time, respectively, to transform the above set of linear partial differential equations into a set of linear algebraic equations. After verification that the quantity under consideration is "well-behaved" at infinity, and that its initial value is zero (see Chapter 1), we can, via Fourier and Laplace transforms, effectively replace the space differential operator V by ik and the time differential operator by - iw.

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