Driscoll, C. F.
Most widely held works by
C. F Driscoll
Nonneutral plasma physics : Washington, DC, 1988 by Nonneutral Plasma Physics Symposium (
Book
)
10
editions published
between
1988
and
1989
in
English
and held by
208
libraries
worldwide
Nonneutral plasma physics IV : Workshop on NonNeutral Plasmas : San Diego, California, 30 July2 August 2001 by Workshop on NonNeutral Plasmas (
Book
)
3
editions published
between
2001
and
2002
in
English
and held by
110
libraries
worldwide
Instability in nonlinear solitary wave systems by C. F Driscoll (
file
)
2
editions published
in
1976
in
English
and held by
4
libraries
worldwide
Transport of Nonneutral Plasmas
(
Book
)
1
edition published
in
1990
in
English
and held by
1
library
worldwide
The research program includes both ongoing experiments and theory on transport in pure electron plasmas; and the design, construction and operation of a new pure ion plasma apparatus. Recent experiments on the electron apparatus have elucidated the transport and turbulence associated with diocotron instabilities and vortex structures, and have measured the vortex pairing instability in detail. Recent theory work has analyzed the newly observed diocotron instability, analyzed negative temperature 2D thermal equilibria, and investigated the crystalline equilibria of cold ion clusters. The characteristics of the new ion apparatus have been determined, the major components have been designed, and purchasing and construction is underway. (jhd)
Experimental Observation of Fluid Echoes in a NonNeutral Plasma
(
Book
)
1
edition published
in
2002
in
English
and held by
1
library
worldwide
Experimental observation of a nonlinear fluid echo is presented which demonstrates the reversible nature of spatial Landau damping, and that nonneutral plasmas behave as nearly ideal 2D fluids. These experiments are performed on UCSD's CamV PenningMalmberg trap with magnetized electron plasmas. An initial m (sub i) = 2 diocotron wave is excited, and the received wall signal damps away in about 5 wave periods. The density perturbation filaments are observed to wrap up as the wave is spatially Landau damped. An m (sub t) = 4 "tickler" wave is then excited, and this wave also Landau damps. The echo consists of a spontaneous appearance of a third m (sub e) = 2 wave after the responses to the first two waves have inviscidly damped away. The appearance time of the echo agrees with theory, and data suggests the echo is destroyed at least partly due to saturation
Thermal Excitation of TrivelpieceGould 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, nearthermalequilibrium 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 nondestructive temperature diagnostic agrees well with standard diagnostics, and may be useful for expensive species such as antimatter
Trapped Particle Asymmetry Modes in NonNeutral Plasmas
(
Book
)
1
edition published
in
2002
in
English
and held by
1
library
worldwide
Novel trapped particle asymmetry modes propagate on cylindrical electron columns when axial variations in the wall voltage cause particle trapping. These modes consist of E x B drifts of edgetrapped particles, partially shielded by axial flows of interior untrapped particles. A simple theory model agrees well with the observed frequencies and eigenfunctions; but the strong mode damping is as yet unexplained. These modes may be important in coupling trap asymmetries to particle motions and low frequency E x B drift modes
Landau Damping of Electron Plasma Waves in the Linear and Trapping Regimes
(
Book
)
1
edition published
in
2002
in
English
and held by
1
library
worldwide
Linear Landau damping and nonlinear waveparticle trapping oscillations are observed with m(sub theta) = 0 standing plasma waves (TrivelpieceGould 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
Pure Electron Plasmas near Thermal Equilibrium
(
Book
)
2
editions published
between
1990
and
1996
in
English
and held by
1
library
worldwide
Plasmas are the central element in many physical systems, including devices to generate radiation or high tensity beams of particles. Plasma effects are important in modern high current accelerator concepts, especially collective effect accelerators. They are central to the thermonuclear reactor problem, and of course outdoor plasmas dominate the physics of a large portion of the known universe. The physics of these systems can be very complex, and most of the devious ways by which plasmas manage to cross magnetic fields are not yet well understood. The research seeks to obtain tests of plasma theory under the simplest possible circumstances, and when the theory is inadequate, to develop it further. The ultimate motivation of the work has been to improve our understanding for application to a variety of physical systems. The direction for the program has been determined by the apparatus and by the internal logic of the science which we are attempting to expand. Research results: The Electron Containment Apparatus, Transport to Equilibrium; Experiments, Transport to Equilibrium Theory, Anisotropic Temperature Relaxation, Strongly Correlated State and Normal Modes, Fluid Instabilities and Turbulence, Vortex Dynamics, Negative Temperature Equilibria, IonElectron Scaling, Plasmas Near the Brillouin Limit, Induced Wave Damping and Transport, Nonlinear and Finite Length Diocotron Modes
Shear Reduction of 2D Point Vortex Diffusion
(
Book
)
1
edition published
in
2002
in
English
and held by
1
library
worldwide
Theory and simulations establish the effects of shear on the collisional diffusion of a 2D point vortex gas. For finite shear, the diffusion is considerably smaller than previous zeroshear theories predict, scaling inversely with the shear. Surprisingly, changing the sign of the applied shear changes the diffusion by an order of magnitude
ShearLimited Test Particle Diffusion in 2Dimensional Plasmas
(
Book
)
1
edition published
in
2002
in
English
and held by
1
library
worldwide
Measurements of testparticle 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 "longrange" ionion collisions in the quiescent, steadystate 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 longrange 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 TaylorMcNamara estimates for a shearfree 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 TaylorMcNamara limit
NonNeutral Plasma Physics 4. Workshop on NonNeutral Plasmas (2001) Held in San Diego, California on 30 July2 August 2001
(
file
)
1
edition published
in
2002
in
English
and held by
0
libraries
worldwide
The preface summarizes workshop content and activities. The 89 scientific articles describe current nonneutral plasma research in the areas of antimatter plasmas, strongly coupled plasmas, beams, waves, transport, 2D fluids, general theory, experimental devices, and toroidal systems
Transport in Nonneutral Plasmas
(
file
)
1
edition published
in
1996
in
English
and held by
0
libraries
worldwide
The AASERT supplement N000149310824 provided partial support for three graduate students. The students performed research on an existing pure electron plasma containment apparatus, on a new laser diagnosed ion plasma apparatus, and on a new camera diagnosed electron apparatus. The transport experiments recently demonstrated that energy and particle transfer across magnetic fields can be greatly enhanced due to long range interparticle collisions, stimulating new theory work. The experiments on collective plasma flows relate directly to conventional fluids, and demonstrated the spontaneous formation of 'vortex crystal' states during the relaxation of 2D turbulence. These experiments are also relevant to the technologies of ion cluster traps used for spectroscopic studies (EBIT) and time standards (Penning Traps)
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Alternative Names
Driscoll, Charles Fredrick
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