970 research outputs found
Comparison of particle trajectories and collision operators for collisional transport in nonaxisymmetric plasmas
In this work, we examine the validity of several common simplifying
assumptions used in numerical neoclassical calculations for nonaxisymmetric
plasmas, both by using a new continuum drift-kinetic code and by considering
analytic properties of the kinetic equation. First, neoclassical phenomena are
computed for the LHD and W7-X stellarators using several versions of the
drift-kinetic equation, including the commonly used incompressible-ExB-drift
approximation and two other variants, corresponding to different effective
particle trajectories. It is found that for electric fields below roughly one
third of the resonant value, the different formulations give nearly identical
results, demonstrating the incompressible ExB-drift approximation is quite
accurate in this regime. However, near the electric field resonance, the models
yield substantially different results. We also compare results for various
collision operators, including the full linearized Fokker-Planck operator. At
low collisionality, the radial transport driven by radial gradients is nearly
identical for the different operators, while in other cases it is found to be
important that collisions conserve momentum
Direct construction of optimized stellarator shapes. III. Omnigenity near the magnetic axis
The condition of omnigenity is investigated, and applied to the near-axis
expansion of Garren and Boozer (1991a). Due in part to the particular
analyticity requirements of the near-axis expansion, we find that, excluding
quasi-symmetric solutions, only one type of omnigenity, namely
quasi-isodynamicity, can be satisfied at first order in the distance from the
magnetic axis. Our construction provides a parameterization of the space of
such solutions, and the cylindrical reformulation and numerical method of
Landreman and Sengupta (2018); Landreman et al. (2019), enables their efficient
numerical construction
A single-field-period quasi-isodynamic stellarator
A single-field-period quasi-isodynamic stellarator configuration is
presented. This configuration, which resembles a twisted strip, is obtained by
the method of direct construction, that is, it is found via an expansion in the
distance from the magnetic axis. Its discovery, however, relied on an
additional step involving numerical optimization, performed within the space of
near-axis configurations defined by a set of adjustable magnetic-field
parameters. This optimization, completed in 30 seconds on a single cpu core
using the SIMSOPT code, yields a solution with excellent confinement, as
measured by the conventional figure of merit for neoclassical transport,
effective ripple, at a modest aspect ratio of eight. The optimization
parameters that led to this configuration are described, its confinement
properties are assessed, and a set of magnetic-field coils is found. The
resulting transport at low collisionality is much smaller than that of W7-X,
and the device needs significantly fewer coils thanks to the reduced number of
field periods.Comment: 13 pages, 9 figure
From Bare Metal Powders to Colloidally Stable TCO Dispersions and Transparent Nanoporous Conducting Metal Oxide Thin Films
Cataloged from PDF version of article.A simple, green, robust, widely applicable, multi-gram and cost-effective 'one-pot' synthesis of aqueous dispersions of colloidally stable 3-6 nm TCO NPs using bare metal powder precursors is described, and their utilization for making TCO high surface area nanoporous films is also demonstrated, which speaks well for their usage in a wide range of possible processes and devices. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Collisional damping rates for plasma waves
The distinction between the plasma dynamics dominated by collisional
transport versus collective processes has never been rigorously addressed until
recently. A recent paper [Yoon et al., Phys. Rev. E 93, 033203 (2016)]
formulates for the first time, a unified kinetic theory in which collective
processes and collisional dynamics are systematically incorporated from first
principles. One of the outcomes of such a formalism is the rigorous derivation
of collisional damping rates for Langmuir and ion-acoustic waves, which can be
contrasted to the heuristic customary approach. However, the results are given
only in formal mathematical expressions. The present Brief Communication
numerically evaluates the rigorous collisional damping rates by considering the
case of plasma particles with Maxwellian velocity distribution function so as
to assess the consequence of the rigorous formalism in a quantitative manner.
Comparison with the heuristic ("Spitzer") formula shows that the accurate
damping rates are much lower in magnitude than the conventional expression,
which implies that the traditional approach over-estimates the importance of
attenuation of plasma waves by collisional relaxation process. Such a finding
may have a wide applicability ranging from laboratory to space and
astrophysical plasmas.Comment: 5 pages, 2 figures; Published in Physics of Plasmas, volume/Issue
23/6. Publisher: AIP Publishing LLC. Date: Jun 1, 2016. URL:
http://aip.scitation.org/doi/10.1063/1.4953802 Rights managed by AIP
Publishing LL
Non-destructive controlled single-particle light scattering measurement
We present a set of light scattering data measured from a millimeter-sized extraterrestrial rock sample. The data were acquired by our novel scatterometer, which enables accurate multi-wavelength measure- ments of single-particle samples whose position and orientation are controlled by ultrasonic levitation. The measurements demonstrate a non-destructive approach to derive optical properties of small mineral samples. This enables research on valuable materials, such as those returned from space missions or rare meteorites.Peer reviewe
Linearized model Fokker-Planck collision operators for gyrokinetic simulations. II. Numerical implementation and tests
A set of key properties for an ideal dissipation scheme in gyrokinetic
simulations is proposed, and implementation of a model collision operator
satisfying these properties is described. This operator is based on the exact
linearized test-particle collision operator, with approximations to the
field-particle terms that preserve conservation laws and an H-Theorem. It
includes energy diffusion, pitch-angle scattering, and finite Larmor radius
effects corresponding to classical (real-space) diffusion. The numerical
implementation in the continuum gyrokinetic code GS2 is fully implicit and
guarantees exact satisfaction of conservation properties. Numerical results are
presented showing that the correct physics is captured over the entire range of
collisionalities, from the collisionless to the strongly collisional regimes,
without recourse to artificial dissipation.Comment: 13 pages, 8 figures, submitted to Physics of Plasmas; typos fixe
Linearized model Fokker-Planck collision operators for gyrokinetic simulations. I. Theory
A new analytically and numerically manageable model collision operator is
developed specifically for turbulence simulations. The like-particle collision
operator includes both pitch-angle scattering and energy diffusion and
satisfies the physical constraints required for collision operators: it
conserves particles, momentum and energy, obeys Boltzmann's H-theorem
(collisions cannot decrease entropy), vanishes on a Maxwellian, and efficiently
dissipates small-scale structure in the velocity space. The process of
transforming this collision operator into the gyroaveraged form for use in
gyrokinetic simulations is detailed. The gyroaveraged model operator is shown
to have more suitable behavior at small scales in phase space than previously
suggested models. A model operator for electron-ion collisions is also
presented.Comment: revtex, 12 page
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