Results 61 to 70 of about 2,047 (170)

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

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

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

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

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  

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

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

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

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

Turbulent edge structure formation in complex configurations

, 2003
Formation of nonlinear structures in drift-Alfvén turbulence is investigated in the often complex edge geometries of stellarator and tokamak configurations, by analysis of drift waveturbulence simulations using a model in which three-dimensional magnetic
Ball, R., Dewar, R. L., Kendl, A., Scott, B. D.   +3 more
core   +1 more source