Results 91 to 100 of about 18,475 (245)

Near-surface expansion of vacuum stellarator configurations

Nuclear Fusion
Stellarators are inherently steady-state and disruption-free. However, three-dimensional geometry significantly increases the complexity of both equilibrium calculation and configuration optimization.
Ke Liu, Zhexuan Zheng, Caoxiang Zhu
doaj   +1 more source

Sensitivity of magnetic islands in permanent magnet stellarators using the gradient and Hessian methods

Nuclear Fusion
Stellarator plasmas are known to be very sensitive to perturbations in the magnetic field. The permanent magnet stellarator was in part developed as a solution to high machining tolerances placed on the shape properties of electromagnetic coils in ...
A. Chambliss, C. Zhu, D. Gates, M. Zarnstorff, T. Qian   +4 more
doaj   +1 more source

Simulation System for the Wendelstein 7-X Safety Control System

, 2018
The Wendelstein 7-X (W7-X) Safety Instrumented System (SIS) ensures personal safety and investment protection. The development and implementation of the SIS are based on the international safety standard for the process industry sector, IEC 61511.
Herbst, U., Naujoks, D., Pingel, S., Schacht, J., Team, the W7-X, Woelk, A.   +5 more
core   +1 more source

Gyrokinetic prediction of core tungsten peaking in a WEST plasma with nitrogen impurities

Nuclear Fusion
Tungsten peaking is predicted in the core of a WEST plasma with total-f gyrokinetic simulations, including both collisional and turbulent transport. This prediction is validated with a synthetic diagnostic of the bolometry.
J. Dominski, P. Maget, P. Manas, J. Morales, S. Ku, A. Scheinberg, C.S. Chang, R. Hager, M. O’Mullane, the WEST team   +9 more
doaj   +1 more source

Neutronics analysis of spin-polarized fuel in spherical tokamaks

Nuclear Fusion
The effect of spin-polarized deuterium–tritium fuel on the blanket, magnets, and surrounding structures is analyzed for a spherical tokamak fusion power plant.
Jin Whan Bae, Katarzyna Borowiec, Vittorio Badalassi, Jason Parisi, Ahmed Diallo, Jon Menard, Andrei Khodak, Thomas Brown   +7 more
doaj   +1 more source

Converting energy from fusion into useful forms

, 2013
If fusion power reactors are to be feasible, it will still be necessary to convert the energy of the nuclear reaction into usable form. The heat produced will be removed from the reactor core by a primary coolant, which might be water, helium, molten ...
Harrington, C., Jenkins, I., Kiely, C., Kovari, M.   +3 more
core   +1 more source

Enhancing stellarator accessibility through port size optimization

Nuclear Fusion
Access to the plasma chamber in a stellarator reactor is essential for maintenance and diagnostics. However, the complex geometry of stellarator coils, often characterized by their strong twisting, can severely limit the space available for access ports.
A. Baillod, E.J. Paul, T. Elder, J.M. Halpern   +3 more
doaj   +1 more source

Comparing linear ion-temperature-gradient-driven mode stability of the National Compact Stellarator Experiment and a shaped tokamak

, 2013
One metric for comparing confinement properties of different magnetic fusion energy configurations is the linear critical gradient of drift wave modes.
Baumgaertel, J. A., Hammett, G. W., Mikkelsen, D. R.   +2 more
core   +1 more source

Stellar populations

, 2013
This is a summary of my lectures during the 2011 IAC Winter School in Puerto de la Cruz. I give an introduction to the field of stellar populations in galaxies, and highlight some new results. Since the title of the Winter School was {\it Secular Evolution of Galaxies} I mostly concentrate on nearby galaxies, which are best suited to study this theme ...
openaire   +3 more sources

Stellar Prominences [PDF]

Symposium - International Astronomical Union, 1996
I review recent observational and theoretical progress in the study of condensations of cool material trapped in the coronae of rapidly rotating stars. Such condensations were discovered over a decade ago, producing transient moving absorption features in the optical Balmerseries lines.
openaire   +2 more sources