Results 21 to 30 of about 161 (152)

Global stochastic optimization of stellarator coil configurations

Journal of Plasma Physics, 2022
In the construction of a stellarator, the manufacturing and assembling of the coil system is a dominant cost. These coils need to satisfy strict engineering tolerances, and if those are not met the project could be cancelled as in the case of the National Compact Stellarator Experiment (NCSX) project (R.L.
Silke Glas, Misha Padidar, Ariel Kellison, David Bindel   +3 more
openaire   +2 more sources

An Enhanced Evaluation Method of Sequential Probability Ratio Test

Mathematical Problems in Engineering, Volume 2019, Issue 1, 2019., 2019
Accurate event detection has high priority in many technical applications. Events in acquired data series, their duration, and statistical parameters provide useful information about the observed system and about its current state. This information can be used for condition monitoring, state identification, and many kinds of forecasting as well.
Gabor Gardonyi, Gabor Por, Krisztian Samu, Akhil Garg   +3 more
wiley   +1 more source

Design of transverse magnetic field sweeping solenoids for 140 GHz mega‐watt gyrotrons

The Journal of Engineering, Volume 2018, Issue 14, Page 682-685, 2018., 2018
As the overlarge power density at the collector of mega‐watt (MW) gyrotrons limits the increase in their average output power and pulse width, transverse magnetic field sweeping solenoids (TMFSS) with periodical changing magnetic field have been designed for a 140 GHz MW gyrotron developed and tested at Beijing Vacuum Electronics Research Institute ...
Xu Zeng, Bentian Liu, Jinjun Feng
wiley   +1 more source

Optimization of nonlinear turbulence in stellarators

Journal of Plasma Physics
We present new stellarator equilibria that have been optimized for reduced turbulent transport using nonlinear gyrokinetic simulations within the optimization loop. The optimization routine involves coupling the pseudo-spectral GPU-native gyrokinetic codeGXwith the stellarator equilibrium and optimization codeDESC.
Kim, P., Buller, S., Conlin, R., Dorland, W., Dudt, D.W., Gaur, R., Jorge, R., Kolemen, E., Landreman, M., Mandell, N.R., Panici, D.   +10 more
openaire   +2 more sources

Stochastic diffusion of energetic ions in optimized stellarators [PDF]

Physics of Plasmas, 2001
It is shown that the collisionless transformation of locally trapped and passing particle orbits in the optimized stellarators of the Wendelstein line results in stochastic diffusion of energetic ions. This diffusion can lead to the loss of a significant fraction of the energetic ion population from the region where the characteristic diffusion time is
Beidler, C., Kolesnichenko, Y., Marchenko, V., Sidorenko, I., Wobig, H.   +4 more
openaire   +2 more sources

Suppression of non-axisymmetric field-induced α-particle loss channels in a quasi-axisymmetric stellarator

AIP Advances, 2022
In future fusion reactors, the confinement of α-particles is a crucial issue. The perfect omnigenity may be difficult to achieve in the quasi-isodynamic and quasi-symmetric stellarators when a multi-objective optimization is considered.
Yichao Zhang, Haifeng Liu, Jie Huang, Yuhong Xu, Jian Zhang, Akihiro Shimizu, Shinsuke Satake, Mitsutaka Isobe, Xianqu Wang, Jun Cheng, Hai Liu, Xin Zhang, Changjian Tang   +12 more
doaj   +1 more source

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, Amit Kharwandikar, Jasper Dettmar, Michael Endler, Joris Fellinger, Yu Gao, Joachim Geiger, Marcin Jakubowski, Thomas Sieber, Sebastian Thiede, Christian Voß, W7‐X Team   +11 more
wiley   +1 more source

Implementation of the E×B and Grad‐B Drift in the EMC3 Code and Verification Using the Method of Manufactured Solutions

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, Felix Reimold, Wouter Dekeyser, Yuhe Feng, Giovanni Samaey, Martine Baelmans   +5 more
wiley   +1 more source

A novel discontinuous-Galerkin deterministic neutronics model for fusion applications: workflow for stellarator reactor design studies

Nuclear Fusion
Stellarator reactor design and optimization requires quick and accurate neutronic simulations for obtaining tritium breeding ratio, coil neutron flux, and volumetric neutron heating.
Timo J. Bogaarts, Felix Warmer
doaj   +1 more source

Direct microstability optimization of stellarator devices

Physical Review E
8 pages, 6 figures, accepted in Physical Review ...
R. Jorge, W. Dorland, P. Kim, M. Landreman, N. R. Mandell, G. Merlo, T. Qian   +6 more
openaire   +3 more sources