Non-neutral plasma physics IV : Workshop on Non-Neutral Plasmas : San Diego, California, 30 July-2 August 2001 by Workshop on Non-Neutral Plasmas

(
Book
)
7
editions published
between
2001
and
2002
in
English and Swedish
and held by
120
libraries
worldwide

Étude expérimentale de la stochasticité intrinsèque dans un plasma magnétisé by François Anderegg

(
Book
)
6
editions published
between
1988
and
1989
in
French and Undetermined
and held by
6
libraries
worldwide

Stochastic particle acceleration in an electrostatic wave by F Skiff

(
Book
)
1
edition published
in
1987
in
English
and held by
2
libraries
worldwide

Shear-Limited Test Particle Diffusion in 2-Dimensional Plasmas
(
Book
)
1
edition published
in
2002
in
English
and held by
1
library
worldwide

Measurements of test-particle diffusion in pure ion plasmas show 2D enhancements over the 3D rates, limited by shear in the plasma rotation omega epsilon (r). The diffusion is due to "long-range" ion-ion collisions in the quiescent, steady-state Mg+ plasma. For short plasma length Lp and low shear S (equivalent to) r partial derivative omega epsilon/partial derivative r, thermal ions bounce axially many times before shear separates them in theta, so the ions move in (r, theta) as bounce averaged "rods" of charge (i.e. 2D point vortices). Experimentally, we vary the number of bounces over the range 0.2 </= N(sub b) </= 10,000. For long plasmas with N (sub b) </= 1, we observe diffusion in quantitative agreement with the 3D theory of long-range E x B drift collisions. For shorter plasmas or lower shear, with N(sub b)> 1, we measure diffusion rates enhanced by up to 100X. For exceedingly small shear, i.e. N(sub b)>/= 1000, we observe diffusion rates consistent with the Taylor-McNamara estimates for a shear-free thermal plasma. Overall, the data shows fair agreement with Dubin's new theory of 2D diffusion in shear, which predicts an enhancement of D(sup 2D)/D(sup 3D) N(sub b) ^ N(sub b) up to the Taylor-McNamara limit

Measurement of Landau damping of electron plasma waves in the linear and trapping regimes by James R Danielson

(
Book
)
1
edition published
in
2002
in
English
and held by
1
library
worldwide

Linear Landau damping and nonlinear wave-particle trapping oscillations are observed with m(sub theta) = 0 standing plasma waves (Trivelpiece-Gould modes) in a trapped pure electron plasma. The measured linear damping rate (10 (exp -3 </^gamma/omega </^ 10 (exp -1) agrees quantitatively with Landau damping theory for moderate plasma temperatures (1 <T <3 eV), and exceedingly low wave amplitudes (delta n/n <10 (exp -6). At larger amplitudes, the wave initially damps at the Landau rate, then develops trapping oscillations at frequency ohm(sub tr), causing the effective damping rate to decrease with amplitude as first predicted by O'Neil in 1965. For comparison, the measured damping rate is observed to decrease dramatically when the resonant particles are eliminated by truncating the nominally Maxwellian velocity distribution

The ponderomotive force in a magnetized plasma : the effect of RF induced magnetization by M. L Sawley

(
Book
)
1
edition published
in
1985
in
English
and held by
1
library
worldwide

Non-Neutral Plasma Physics 4. Workshop on Non-Neutral Plasmas (2001) Held in San Diego, California on 30 July-2 August 2001
(
Book
)
2
editions published
in
2002
in
English
and held by
1
library
worldwide

The preface summarizes workshop content and activities. The 89 scientific articles describe current non-neutral plasma research in the areas of antimatter plasmas, strongly coupled plasmas, beams, waves, transport, 2D fluids, general theory, experimental devices, and toroidal systems

Thermal Excitation of Trivelpiece-Gould Modes in a Pure Electron Plasma
(
Book
)
1
edition published
in
2002
in
English
and held by
1
library
worldwide

Thermally excited plasma modes are observed in trapped, near-thermal-equilibrium pure electron plasmas over a temperature range of 0.05 <T <5 eV. The measured thermal emission spectra together with a separate measurement of the wave absorption coefficient uniquely determines the temperature. Alternately, kinetic theory including the antenna geometry and the measured mode damping (i.e. spectral width) gives the plasma impedance, obviating the reflection measurement. This non-destructive temperature diagnostic agrees well with standard diagnostics, and may be useful for expensive species such as anti-matter

Thermal excitation of Trivelpiece-Gould modes in a pure electron plasma by François Anderegg

(
file
)
1
edition published
in
2002
in
Undetermined
and held by
0
libraries
worldwide

Thermally excited plasma modes are observed in trapped, near-thermal-equilibrium pure electron plasmas over a temperature range of 0.05<T<5 eV. The measured thermal emission spectra together with a separate measurement of the wave absorption coefficient uniquely determines the temperature. Alternately, kinetic theory including the antenna geometry and the measured mode damping (i.e. spectral width) gives the plasma impedance, obviating the reflection measurement. This non-destructive temperature diagnostic agrees well with standard diagnostics, and may be useful for expensive species such as anti-matter