Results 21 to 30 of about 2,329 (224)
Stellar ages from stellar rotation [PDF]
Proceedings of the International Astronomical Union, 2008 AbstractOur ability to determine stellar ages from measurements of stellar rotation, hinges on how well we can measure the dependence of rotation on age for stars of different masses. Rotation periods for stars in open clusters are essential to determine the relations between stellar age, rotation, and mass.
openaire +2 more sources
Nature, 1931 \textit{E. A. Milne} hat mehrere Einwände gegen die Jeanssche Theorie des Sterninnerns erhoben [``Stellar structure and the origin of stellar energy'', Nature 127, 16--27 (1931; \url{doi:10.1038/127016a0})]. Er behauptet, daß Jeans das Vorhandensein von Riesen, Zwergen und weißen Zwergen nur durch Zuhilfenahme von ad hoc-Hypothesen, die der Physik ...
Russell, H. N., Atkinson, R. d'E.
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Constructing the space of quasisymmetric stellarators [PDF]
, 2023 A simplified view of the space of optimised stellarators has the potential to guide and aid the design efforts of magnetic confinement configurations suitable for future fusion reactors.
Rodriguez, E. ; https://orcid.org/ +8 more
core +1 more source
Finite orbit width effects in large aspect ratio stellarators
, 2022 New orbit averaged equations for low collisionality neoclassical fluxes in large aspect ratio stellarators with mirror ratios close to unity are derived. The equations retain finite orbit width effects by employing the second adiabatic invariant $J$ as a
d'Herbemont, Vincent +3 more
core +1 more source
Stability in straight stellarators [PDF]
, 1981 The stability of the straight stellarator against localized interchange modes is investigated employing the Mercier-Greene-Johnson criterion. Critical values of ..beta.. are obtained both numerically and analytically. The conclusion is that for classical
Yoshikawa, S. +3 more
core +1 more source
Stellar Motions and Stellar Dynamics [PDF]
Transactions of the International Astronomical Union, 1962 The texts of the twelve prepared contributions, often in abbreviated form, are given first; they are followed by a summary of the discussion on all the contributions considered together.
A. Blaauw +8 more
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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 ...
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Heat Load Mitigation Studies in the W7‐X Stellarator Experiment
Contributions to Plasma Physics, EarlyView.ABSTRACT During the experiments at the stellarator Wendelstein 7‐X (W7‐X) with fully water‐cooled plasma‐facing components (PFC), including carbon‐fiber composite (CFC) divertor targets with a thermal load capability of 10 MW/m2, high performance was achieved.
Dirk Naujoks +11 more
wiley +1 more source
Contributions to Plasma Physics, EarlyView.ABSTRACT Effective management of particle and power exhaust is essential for fusion reactor operation, requiring accurate 3D modeling of divertor physics. The EMC3 code is a well‐established Monte Carlo tool for plasma transport in stellarator edge regions, but until now lacked E×B$$ E\times B $$ and diamagnetic drifts.
Ruben De Wolf +5 more
wiley +1 more source
Effect of Magnetic Islands on Neoclassical Heat Diffusivity in a Global Tokamak Simulation
Contributions to Plasma Physics, EarlyView.ABSTRACT Resonant magnetic perturbations (RMPs) alter magnetic field topology via island formation and can modify core transport in toroidal fusion devices. Using the global gyrokinetic particle‐in‐cell code XGC‐S, originally developed for stellarator geometries, we quantify how island topology affects neoclassical heat transport in a circular tokamak ...
Joseph X. Li +5 more
wiley +1 more source