Results 61 to 70 of about 2,075 (173)

A new continuous optimization method of standardized cubic permanent magnets for stellarators

Nuclear Fusion
Stellarator configurations can be realized using permanent magnets in combination with tokamak-like planar coils. From the perspective of engineering feasibility and cost-effectiveness, using standardized cubic permanent magnets with a finite number of ...
Xiangyu Zhang, Dehong Chen, Guosheng Xu, Zhiyuan Lu, Caoxiang Zhu, Liang Chen, Minyou Ye, Baonian Wan   +7 more
doaj   +1 more source

Suppression of tearing modes by External Rotational Transform in a Tokamak-Stellarator hybrid configuration on J-TEXT

Nuclear Fusion
A Tokamak-Stellarator hybrid configuration has been established on the J-TEXT tokamak by the application of stellarator-like External Rotational Transform (ERT) coils.
Yangbo Li, Nengchao Wang, Bo Rao, Feiyue Mao, Chuanxu Zhao, Zhengkang Ren, Zhiyu Meng, Zijian Xuan, Song Zhou, Ruomu Wang, Xixuan Chen, Wei Zheng, Yasuhiro Suzuki, Zhonghe Jiang, the J-TEXT Team   +14 more
doaj   +1 more source

Remote-Steering Antennas for 140 GHz Electron Cyclotron Heating of the Stellarator W7-X

EPJ Web of Conferences, 2017
For electron cyclotron resonance heating of the stellarator W7-X at IPP Greifswald, a 140 GHz/10 MW cw millimeter wave system has been built. Two out of 12 launchers will employ a remote-steering design. This paper describes the overall design of the two
Lechte C., Kasparek W., Plaum B., Zeitler A., Erckmann V., Laqua H., Schneider N., Weissgerber M., Bechtold A., Busch M., Szepaniak B.   +10 more
doaj   +1 more source

Results from helical axis stellarators

, 2001
Helical axis stellarators produce magnetic surfaces of high rotational transform and moderate shear solely by means of external currents, with the promise of high b.
Blackwell, B. D.
core   +1 more source

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

Electromagnetic coil optimization for reduced Lorentz forces

Nuclear Fusion
The reduction of magnetic forces on electromagnetic coils is an important consideration in the design of high-field devices such as the stellarator or tokamak.
Siena Hurwitz, Matt Landreman, Paul Huslage, Alan Kaptanoglu   +3 more
doaj   +1 more source

Collisionless microinstabilities in stellarators I - analytical theory of trapped-particle modes

, 2013
This is the first of two papers about collisionless, electrostatic micro-instabilities in stellarators, with an emphasis on trapped-particle modes. It is found that, in so-called maximum-$J$ configurations, trapped-particle instabilities are absent in ...
Helander, P., Plunk, G. G., Proll, J. H. E.   +2 more
core   +1 more source

CIEMAT-QI4X: a reactor-relevant quasi-isodynamic stellarator configuration compatible with an island divertor

Nuclear Fusion
A four-field-period quasi-isodynamic stellarator configuration is presented that exhibits small neoclassical and electrostatic turbulent transport, good fast-ion confinement over a wide range of β values, small bootstrap current and an edge island ...
E. Sánchez, J.L. Velasco, I. Calvo, J.M. García-Regaña, C. Salcuni, J.A. Alonso   +5 more
doaj   +1 more source

The case of the trapped singularities [PDF]

, 2004
A case study in bifurcation and stability analysis is presented, in which reduced dynamical system modelling yields substantial new global and predictive information about the behaviour of a complex system.
Ball, R.
core  

Electron Bernstein waves emission in the TJ-II Stellarator

, 2011
Taking advantage of the electron Bernstein waves heating (EBWH) system of the TJ-II stellarator, an electron Bernstein emission (EBE) diagnostic was installed.
A Ros, Alejaldre C, Bekefi G, Bornatici M, Castejón F, Castejón F, Caughman J B O, Caughman J B O, Chandrasekhar M, D A Rasmussen, F Castejón, Igami H, J B O Caughman, J B Wilgen, J M García-Regaña, Köhn A, Laqua H P, Laqua H P, M Tereshchenko, Preinhaelter, Tereshchenko M A, Tribaldos V van Milligen B P López-Fraguas A L, Á Cappa   +22 more
core   +1 more source