Results 51 to 60 of about 4,926 (209)
Symposium - International Astronomical Union, 1997 The last two decades have seen the emergence of a new field in stellar astrophysics, the study of stellar coronae mostly in X-ray domain. With the advent of soft X-ray imagery X-ray emission was found from many thousands of solar-like stars. I will summarize the most important findings of X-ray surveys of late type stars and put the results in the ...
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Formation of a Boron‐Oxide Termination for the (100) Diamond Surface
Advanced Materials Interfaces, Volume 11, Issue 33, November 25, 2024.A boron‐oxide termination for (100) diamond is formed under ultrahigh vacuum conditions. This is the first demonstration of a new method of introducing a boron‐based species to the diamond lattice. This result has potential for enabling new surface‐based pathways to the fabrication of high quality boron‐doped delta layers and boron‐based material ...
Alex K. Schenk +4 more
wiley +1 more source
Modification of ion-temperature-gradient turbulence by impurities in stellarator plasmas
Nuclear FusionRecent nonlinear gyrokinetic simulations have shown that impurities can strongly modify the turbulent heat flux in stellarator plasmas. Here, the ion-temperature-gradient (ITG) dispersion relation in a plasma containing impurities is analytically solved ...
Iván Calvo +3 more
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Nuclear Materials and Energy, 2022 The utilization of metal additively manufactured radial plates and conductors for high-field modular-stellarator coils is assessed, particularly, for resistive coils having turns of variable cross-section (additively manufactured aluminium or copper ...
V. Queral +3 more
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Methods for Color Center Preserving Hydrogen‐Termination of Diamond
Advanced Materials Interfaces, Volume 11, Issue 24, August 23, 2024.Hydrogen‐termination of diamond by three methods. Hydrogen plasma exposure with stage heating above 700 °C yields maximal coverage but causes irr loss of shallow nitrogen‐vacancy fluorescence. Plasma exposure without heating preserves nitrogen‐vacancies at the expense of increased oxygen coverage.
Daniel J. McCloskey +8 more
wiley +1 more source
Nuclear FusionDesigning a fusion energy device to produce as much energy as possible requires balancing numerous physics constraints and metrics. In stellarators, the geometry is very flexible and involves a large number of free parameters.
R. Laia, R. Jorge, G. Abreu
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Contributions to Plasma Physics, Volume 64, Issue 7-8, August-September 2024.Abstract The distribution pattern of the connection length in the divertor region of Heliotron J was calculated by the field line tracing method. A multifold layer structure, characterized by the range of connection length, was revealed to interpret the response of the transport of the lower‐charged impurity ions to the divertor structure.
F. Cai +18 more
wiley +1 more source
Ideal magnetohydrodynamic equilibria with helical symmetry and incompressible flows
, 1999 A recent study on axisymmetric ideal magnetohydrodynamic equilibria with incompressible flows [H. Tasso and G. N. Throumoulopoulos, Phys. Plasmas {\bf 5}, 2378 (1998)] is extended to the generic case of helically symmetric equilibria with incompressible ...
Tasso, H., Throumoulopoulos, G. N.
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Newtonian stellar models [PDF]
Annals of Physics, 2003 36 pages, LaTex, 14 figures (compressed), uses ...
Heinzle, J. Mark, Uggla, Claes
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Toward plasma drifts in EMC3: Implementation of gradient, divergence, and particle tracing schemes
Contributions to Plasma Physics, Volume 64, Issue 7-8, August-September 2024.Abstract This paper presents a first implementation of gradient, divergence, and particle tracing schemes for the EMC3 code, a stochastic 3D plasma fluid code widely employed for edge plasma and impurity transport modeling in tokamaks and stellarators.
Ruben De Wolf +6 more
wiley +1 more source