Results 1 to 10 of about 99 (69)

A quasi-isodynamic configuration with good confinement of fast ions at low plasma β

Nuclear Fusion, 2023
A new quasi-isodynamic (QI) stellarator configuration optimized for the confinement of energetic ions at low plasma β is obtained. The numerical optimization is carried out using the STELLOPT suite of codes.
E. Sánchez, J.L. Velasco, I. Calvo, S. Mulas   +3 more
doaj   +4 more sources

Trapped electron mode in a quasi-isodynamic stellarator

Nuclear Fusion
Global gyrokinetic simulations find a strongly unstable trapped electron mode excited by a density gradient in a quasi-isodynamic stellarator. The eigenmode structure localizes on the inner side of the torus with an unfavorable magnetic curvature and ...
Javier H. Nicolau, Xishuo Wei, Pengfei Liu, Gyungjin Choi, Zhihong Lin   +4 more
doaj   +3 more sources

Development of quasi-isodynamic stellarators [PDF]

Plasma Physics and Controlled Fusion, 2010
Theoretical stellarator research from MHD-stable stellarators via quasi-helically symmetric ones to Wendelstein 7-X, quasi-axisymmetric tokamaks and quasi-isodynamic stellarators is sketched. Research strategy, computational aspects and various favorable properties are emphasized.
Goodman, A.G., Camacho Mata, K., Henneberg, S.A., Jorge, R., Landreman, M., Plunk, G.G., Smith, H.M., Mackenbach, R.J.J., Beidler, C.D., Helander, P.   +9 more
exaly   +18 more sources

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

Entropy, 2023
A geometrical method for assessing stochastic processes in plasma turbulence is investigated in this study. The thermodynamic length methodology allows using a Riemannian metric on the phase space; thus, distances between thermodynamic states can be ...
Aristeides D. Papadopoulos, Johan Anderson, Eun-jin Kim, Michail Mavridis, Heinz Isliker   +4 more
doaj   +2 more sources

A promising approach to steady-state fusion: High-temperature superconducting strong-field stellarator with precise omnigenity [PDF]

The Innovation
The stellarator has inherent advantages over the tokamak in achieving steady-state operation, especially due to its absence of disruptions and lack of need for current drive and the associated recirculating power.
Guosheng Xu, Zhiyuan Lu, Dehong Chen, Baonian Wan   +3 more
doaj   +2 more sources

Pressure insensitivity of a high-β quasi-isodynamic stellarator [PDF]

Plasma Physics Reports, 2009
The sensitivity of a high-β quasi-isodynamic stellarator equilibrium with respect to changes of the plasma pressure is investigated. It is shown that a plasma boundary near to the high-β boundary exists with the property that the magnetohydrodynamic and drift-kinetic properties of the associated low-β plasma are similar.
V D Shafranov, J Nührenberg, Mikhailov M I   +2 more
exaly   +4 more sources

Resilience of Quasi-Isodynamic Stellarators against Trapped-Particle Instabilities [PDF]

Physical Review Letters, 2012
It is shown that in perfectly quasi-isodynamic stellarators, trapped particles with a bounce frequency much higher than the frequency of the instability are stabilizing in the electrostatic and collisionless limit. The collisionless trapped-particle instability is therefore stable as well as the ordinary electron-density-gradient-driven trapped ...
Josefine Henriette Elise Pröll, Per Helander, Gabriel Plunk   +2 more
exaly   +6 more sources

Quasi-Isodynamic Stellarators with Low Turbulence as Fusion Reactor Candidates

PRX Energy
The stellarator is a type of fusion energy device that—if properly designed—could provide clean, safe, and abundant energy to the grid. To generate this energy, a stellarator must keep a hot mixture of charged particles (known as a plasma) sufficiently ...
Alan G. Goodman, Pavlos Xanthopoulos, Gabriel G. Plunk, Håkan Smith, Carolin Nührenberg, Craig D. Beidler, Sophia A. Henneberg, Gareth Roberg-Clark, Michael Drevlak, Per Helander   +9 more
doaj   +4 more sources

Quasi-isodynamic Configuration With N = 12 and High β

AIP Conference Proceedings, 2006
Results of an optimization toward quasi‐isodynamicity for a stellarator with a comparatively large number of periods, N = 12, are presented. The following set of physics properties to be achieved was used: 1) good long‐time collisionless confinement of α‐particles; 2) small neoclassical transport in the 1/ν regime; 3) small bootstrap current; 4) high ...
Mikhailov M I, Nührenberg J, Shafranov V D   +2 more
exaly   +4 more sources

Reduced electrostatic turbulence in the quasi-isodynamic stellarator configuration CIEMAT-QI4

Nuclear Fusion
CIEMAT-QI4 is a quasi-isodynamic stellarator configuration that simultaneously features very good fast-ion confinement in a broad range of β values, low neoclassical transport and bootstrap current, and ideal magnetohydrodynamic stability up to $\beta ...
J.M. García-Regaña, I. Calvo, E. Sánchez, H. Thienpondt, J.L. Velasco, J.A. Capitán   +5 more
doaj   +2 more sources