e-book

Reviews of Plasma Physics. Volume 24

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The “Reviews of Plasma Physics”, Vol. 24, contains two reviews. This book, as well
as the previous volumes, presents reviews for specialists interested in plasma physics
theory. In the review by V.A. Rozhansky, the problem of currents and self-consistent
electric fields in the magnetized fully ionized plasma is considered. The situation
in fully ionized plasma is completely different from that in solid state, gases, or
partially ionized plasmas, where the current density is proportional to the electric
field. In contrast, in a fully ionized magnetized plasma, a homogeneous electric field
causes drift both for electrons and ions, while a current in the direction of the electric
field is absent. A perpendicular current arises when the electric field is temporary or
spatially dependent. Various mechanisms, when the perpendicular currents are driven
by inertia, collisions with neutrals and different components of viscosity tensor are
analyzed in the review. Current systems in a vicinity of a biased electrode are studied
in connection with such applications as probes, unipolar arc formation, pellets, where
two-dimensional or three-dimensional currents systems determine plasma dynamics,
shielding properties, and current–voltage characteristics.

Since the end of 80th it became clear that self-consistent electric fields play the
key role in the formation of improved confinement regimes (H-regimes) in tokamaks
and stellarators. The poloidal drifts suppress the turbulence and hence the turbulent
transport coefficients so that the transport barriers with steep density and temperature
gradients and reduced transport coefficients are created. It is demonstrated that the
electric field structure is consistent with the experimental observations.

More complicated issues when a radial current is generated in fusion devices are
also considered. In a group of experiments performed on several tokamaks, an electrode
was installed into the plasma (inside the separatrix or last closed flux surface),
and the voltage was applied between this electrode and limiter or divertor plates. The
current–voltage characteristic of such a system, the value of the effective transverse
conductivity, and related problem of toroidal rotation generation in the plasma are analyzed
in the review. In the last few years, new methods of radial current generation
are widely discussed. One of them is connected with the formation of a stochastic
magnetic layer in a separatrix vicinity by special coils (resonance magnetic perturbations).
The aim is to suppress the edge localized modes, and this issue is rather
critical for the successful operation of the International Thermonuclear Experimental
Reactor (ITER). A radial current of electrons in a stochastic magnetic field should
be accompanied by the same radial current of ions similar to the biasing experiments.
As a result, the radial electric field, density, and temperature profiles are significantly
modified, and edge modes are stabilized. The effective electron perpendicular conductivity
in a stochastic magnetic field and the ion perpendicular conductivity, which
are the key players in this situation, are also discussed in the review.

In the second review “Correlations and anomalous transport models” by
O.G. Bakunin, numerous aspects of turbulent transport are considered. This review
is intended to summarize the recent results from the multidisciplinary field of anomalous
diffusion in turbulent plasma. A description of turbulent transport in the presence
of coherent structures, convective rolls, zonal flows, and stochastic magnetic
fields is a very complex problem.

From the methodological point of view, this review focuses on the general use
of correlation estimates, quasilinear equations, and continuous-time random walk approach.
The structure of some derivations, when they may be useful for more general
purposes, is given in detail. Thus, the review provides a fairly informative treatment
of seed diffusion effects in the framework of the correlation description. The relationship
between Lagrangian and Eulerian correlation functions is discussed, and
the problem of relations between stochastic instability and transport effects in a stochastic
magnetic field is analyzed.

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Informasi Detail

Judul Seri

Reviews of Plasma Physics 24

No. Panggil

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Penerbit

New York : Springer-Verlag Berlin Heidelberg., 2008

Deskripsi Fisik

x, 203 hlm.

Bahasa

English

ISBN/ISSN

9783540745761

Klasifikasi

537.532

Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

Volume 24

Subjek

FISIKA PLASMA

Info Detail Spesifik

-

Pernyataan Tanggungjawab

agus

Versi lain/terkait

Lampiran Berkas

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