Results 51 to 60 of about 18,475 (245)
Integration of kinetic ions in a three‐dimensional Monte‐Carlo neutral transport code
Contributions to Plasma Physics, Volume 60, Issue 5-6, June-July 2020., 2020 Abstract Charged particles of species different from the major constituents of a plasma might not reach local thermodynamic equilibrium during their lifespan. Such low collisional ions render the often‐used fluid description, assuming Maxwellian velocity distribution, as insufficient. Hence, kinetic treatment of such minorities becomes inevitable.
Friedrich Schluck
wiley +1 more source
Optimization of flux-surface density variation in stellarator plasmas with respect to the transport of collisional impurities [PDF]
, 2019 Avoiding impurity accumulation is a requirement for steady-state stellarator operation. The accumulation of impurities can be heavily affected by variations in their density on the flux-surface.
Buller, Stefan +4 more
core +2 more sources
Exploration of the parameter space of quasisymmetric stellarator vacuum fields through adjoint optimisation [PDF]
Journal of Plasma PhysicsOptimising stellarators for quasisymmetry leads to strongly reduced collisional transport and energetic particle losses compared with unoptimised configurations.
R. Nies +4 more
semanticscholar +1 more source
Magnetic turnstiles in nonresonant stellarator divertor [PDF]
Physics of Plasmas, 2021 Non-resonant stellarator divertors have magnetic flux tubes, called magnetic turnstiles, that cross cantori, which are fractal remnants of destroyed invariant tori with holes, that lie outside the outermost confining surface.
A. Punjabi, A. Boozer
semanticscholar +1 more source
Distinct turbulence saturation regimes in stellarators [PDF]
, 2017 In the complex 3D magnetic fields of stellarators, ion-temperature-gradient turbulence is shown to have two distinct saturation regimes, as revealed by petascale numerical simulations, and explained by a simple turbulence theory.
Helander, P. +2 more
core +3 more sources
Overdense plasma heating in Wendelstein 7-X(W7-X) stellarator
Results in Physics, 2017 High yield nuclear fusion operating in tokamak and stellarator need to heat plasma up to the required temperatures. As the confined plasma is overdensed, the electron cyclotron resonance heating (ECRH) is inefficient due to cut-off layer.
S. Adlparvar +3 more
doaj +1 more source
Impurity transport and bulk ion flow in a mixed collisionality stellarator plasma
, 2017 The accumulation of impurities in the core of magnetically confined plasmas, resulting from standard collisional transport mechanisms, is a known threat to their performance as fusion energy sources.
Helander, Per +3 more
core +1 more source
Overview of the TJ-II stellarator research programme towards model validation in fusion plasmas
Nuclear Fusion, 2021 TJ-II stellarator results on modelling and validation of plasma flow asymmetries due to on-surface potential variations, plasma fuelling physics, Alfvén eigenmodes (AEs) control and stability, the interplay between turbulence and neoclassical (NC ...
C. Hidalgo +10 more
semanticscholar +1 more source
Fusion Science and Technology, 2004 Stellarators are toroidal devices where the required rotational transform of the magnetic field lines is generated by external field coils and not via an induced net toroidal plasma current. This confinement scheme has the advantages that, in principle, steady-state plasma operation is possible and that it does not have to brace itself against ...
openaire +6 more sources
Ideal MHD theory of low-frequency Alfven waves in the H-1 Heliac [PDF]
, 2012 A part analytical, part numerical ideal MHD analysis of low-frequency Alfven wave physics in the H-1 stellarator is given. The three-dimensional, compressible ideal spectrum for H-1 is presented and it is found that despite the low beta (approx.
B D Blackwell +11 more
core +1 more source