Results 71 to 80 of about 2,075 (173)

MONKES: a fast neoclassical code for the evaluation of monoenergetic transport coefficients in stellarator plasmas

Nuclear Fusion
MONKES is a new neoclassical code for the evaluation of monoenergetic transport coefficients in stellarators. By means of a convergence study and benchmarks with other codes, it is shown that MONKES is accurate and efficient.
F.J. Escoto, J.L. Velasco, I. Calvo, M. Landreman, F.I. Parra   +4 more
doaj   +1 more source

Main results of the first experimental campaign in the stellarator W7-X [PDF]

, 2016
A summary of the first operational phase (OP1.1) at the stellarator W7-X is given. The operational setup of heating and diagnostics as well the results of experiments are briefly described. Plasma parameters and confinement are better than expected: Te >
Alonso, A, Andreeva, T, Baldzuhn, J, Beidler, CD, Beurskens, M, Biedermann, C, Blackwell, B, Blanco, E, Bosch, H-S, Bozhenkov, S, Brakel, R, Burhenn, R, Buttenschön, B, Cappa, A, Czarnecka, A, Dinklage, A, Dostal, M, Drews, P, Endler, M, Estrada, T, Feng, Y, Fornal, T, Fuchert, G, Geiger, J, Grulke, O, Harris, JH, Hartmann, D, Helander, P, Hirsch, M, Hoefel, U, Jakubowski, M, Kiazek, I, Klinger, T, Klose, S, Knauer, J, Kocsis, G, Kornejew, P, Krawczyk, N, Krychowiak, M, Krämer-Flecken, A, Kubkowska, M, König, R, Landreman, M, Langenberg, A, Laqua, HP, Lazerson, S, Liang, Y, Liu, S, Maassberg, H, Marchuk, O, Marsen, S, Marushchenko, NB, Moncada, V, Moseev, D, Naujoks, D, Niemann, H, Otte, M, Pablant, NA, Pasch, E, Pedersen, TS, Pisano, F, Rahbarnia, K, Riße, K, Rudischhauser, L, Rummel, T, Satake, S, Schmitz, O, Schröder, T, Smith, H, Stange, T, Stephey, L, Szepesi, T, Thomsen, H, Traverso, P, Trimino-Mora, H, Tsuchiya, M, Turkin, Yu, Velasco, J-L, Wang, N, Wauters, T, Weir, G, Wolf, R, Wurden, G, Yokoyama, M, Zhang, D   +84 more
core  

Statistical Analysis of Plasma Dynamics in Gyrokinetic Simulations of Stellarator Turbulence. [PDF]

Entropy (Basel), 2023
Papadopoulos AD, Anderson J, Kim EJ, Mavridis M, Isliker H.   +4 more
europepmc   +1 more source

Evaluation of neoclassical transport in nearly quasi-isodynamic stellarator magnetic fields using MONKES

Nuclear Fusion
Stellarator magnetic fields that are perfectly optimized for neoclassical transport (with levels of radial neoclassical transport comparable to tokamaks) are called omnigenous.
F.J. Escoto, J.L. Velasco, I. Calvo, E. Sánchez   +3 more
doaj   +1 more source

Optimization of compact quasi-axisymmetric stellarators

Plasma Physics and Controlled Fusion
Abstract We present the optimization of compact quasi-axisymmetric stellarators with aspect ratio as low as A = 2.4 and varying number of field periods. This previously unexplored optimization space has the striking feature that the symmetry-preserving perturbations remain mostly on the inboard side, and that the axisymmetric volume is ...
Tobias M Schuett, Sophia A Henneberg
openaire   +3 more sources

Reduction of neoclassical bulk-ion transport to avoid helium-ash retention in stellarator reactors

Nuclear Fusion
The reduction of neoclassical energy transport in stellarators has traditionally focussed on optimizing magnetic fields for small values of ‘effective helical ripple’ — $\epsilon_\mathrm{eff}$ , the geometric factor associated with electron $1/\nu ...
C.D. Beidler, M. Drevlak, J. Geiger, P. Helander, H.M. Smith, Y. Turkin   +5 more
doaj   +1 more source

Precise stellarator quasi-symmetry can be achieved with electromagnetic coils. [PDF]

Proc Natl Acad Sci U S A, 2022
Wechsung F, Landreman M, Giuliani A, Cerfon A, Stadler G.   +4 more
europepmc   +1 more source

Experimental characterization of plasma start-up using ECRH in preparation of W7-X operation

EPJ Web of Conferences, 2015
The upcoming operation of Wendelstein 7-X (W7-X) will be supported by an Electron Cyclotron Resonance Heating (ECRH) system working at 140 GHz in second harmonic at the nominal magnetic field of 2.5T.
Preynas M., Aßmus D., Igami H., Kado S., Kobayashi S., Kubo S., Laqua H.P., Mutoh T., Nagasaki K., Otte M., Shimozuma T., Stange T., Yoshimura Y.   +12 more
doaj   +1 more source

Direct optimization of neoclassical ion transport in stellarator reactors

Nuclear Fusion
We directly optimize stellarator neoclassical ion transport while holding neoclassical electron transport at a moderate level, creating a scenario favorable for impurity expulsion and retaining good ion confinement.
B.F. Lee, S.A. Lazerson, H.M. Smith, C.D. Beidler, N.A. Pablant   +4 more
doaj   +1 more source

Targeted Optimization of Quasi-Symmetric Stellarators

, 2016
The proposed research focuses on targeted areas of plasma physics dedicated to improving the stellarator concept. Research was pursued in the technical areas of edge/divertor physics in 3D configurations, magnetic island physics in stellarators, the role of 3D shaping on microinstabilities and turbulent transport and energetic ion confinement in ...
Chris C. Hegna, D. T. Anderson, J. N. Talmadge   +2 more
openaire   +2 more sources