C. F. Driscoll
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View article: Nonlinear beat wave decay of Kelvin/diocotron waves on a two-dimensional vortex
Nonlinear beat wave decay of Kelvin/diocotron waves on a two-dimensional vortex Open
We describe theory and experiments investigating nonlinear beat wave decay of diocotron modes on a nonneutral plasma column (or Kelvin waves on a vortex). Specifically, a Kelvin/diocotron pump wave varying as Ap exp [i(lpθ−ωpt)] decays int…
View article: The electric fields and “lightning jets” of the Sun and solar wind
The electric fields and “lightning jets” of the Sun and solar wind Open
A model of electric energization of the solar wind and corona is developed, including electro-magnetic particle effects precluded by traditional magneto-hydro (MHD) assumptions. Using standard 1D radial solar models for particle density an…
View article: The Electric Fields and "Lightning Jets" of the Sun and Solar Wind
The Electric Fields and "Lightning Jets" of the Sun and Solar Wind Open
A model of electric energization of the Solar Wind and Corona is developed, including electro-magnetic (EM) particle effects precluded by traditional magneto-hydro (MHD) assumptions. Using standard 1-D radial Solar models for particle dens…
View article: Fluid and kinetic nonlinearities of near-acoustic plasma waves
Fluid and kinetic nonlinearities of near-acoustic plasma waves Open
Large amplitude, near-acoustic plasma waves have a temperature-dependent harmonic content and nonlinear frequency shifts. On cold plasmas, experiments show that fluid nonlinearities dominate, and the observed harmonic content is well predi…
View article: Trapped Particle Effects in the Parametric Instability of Near-Acoustic Plasma Waves
Trapped Particle Effects in the Parametric Instability of Near-Acoustic Plasma Waves Open
Quantitative experiments on the parametric decay instability of near-acoustic plasma waves provide strong evidence that trapped particles reduce the instability threshold below fluid models. At low temperatures, the broad characteristics o…
View article: Final Report : Experiments and Theory on Nonlinear Wave Couplings and the Saltpeter Screening Effect
Final Report : Experiments and Theory on Nonlinear Wave Couplings and the Saltpeter Screening Effect Open
This Final Technical Report gives a brief overview of the apparatus upgrades, experimental results, and theory development which was funded by DOE grant DE-SC0008693 from 1-Aug-2012 to 31-Jul-2018. Experiments were performed on the "IV" ap…
View article: Measurements of long-range enhanced collisional velocity drag through plasma wave damping
Measurements of long-range enhanced collisional velocity drag through plasma wave damping Open
We present damping measurements of axial plasma waves in magnetized, multispecies ion plasmas. At high temperatures T≳10−2 eV, collisionless Landau damping dominates, whereas, at lower temperatures T≲10−2 eV, the damping arises from inters…
View article: Fundamental Processes in Plasmas
Fundamental Processes in Plasmas Open
This Final Technical Report gives brief summaries of the plasma physics results developed under DOE grant DE-SC0002451; and provides reference to the published journal articles giving full scientific descriptions. General topics include 1)…
View article: Measurements of correlations enhanced collision rates in the mildly correlated regime (Γ ∼ 1)
Measurements of correlations enhanced collision rates in the mildly correlated regime (Γ ∼ 1) Open
We measure the perpendicular-to-parallel collision rate ν⊥|| in laser cooled, magnetized ion plasmas in the mildly correlated regime of Γ∼ 1 and find collision rates enhanced by exp(Γ). This ν⊥|| enhancement due to correlations is directly…
View article: First Test of Long-Range Collisional Drag via Plasma Wave Damping
First Test of Long-Range Collisional Drag via Plasma Wave Damping Open
This paper presents the first experimental confirmation of a new theory predicting enhanced drag due to long-range collisions in a magnetized plasma. The experiments measure damping of Langmuir waves in a multispecies pure ion plasma, whic…
View article: Cyclotron mode frequencies and resonant absorption in multi-species ion plasmas
Cyclotron mode frequencies and resonant absorption in multi-species ion plasmas Open
Cyclotron mode frequencies are studied on trapped rigid-rotor multi-species ion plasmas. Collective effects and radial electric fields shift the mode frequencies away from the “bare” cyclotron frequencies 2πFc(s)≡(qsB/Msc) for each species…
View article: TG wave autoresonant control of plasma temperature
TG wave autoresonant control of plasma temperature Open
The thermal correction term in the Trivelpiece-Gould (TG) wave's frequency has been used to accurately control the temperature of electron plasma, by applying a swept-frequency continuous drive autoresonantly locked in balance with the cyc…