Abstract
Stellarators, conceived 1951 by Lyman Spitzer in Princeton, are toroidal devices that confine a plasma in a magnetic field which originates from currents in coils outside the plasma. A plasma current driven by external means, for example by an ohmic transformer, is not required for confinement. Supplying the desired poloidal field component by external coils leads to a helically structured plasma topology. Thus stellarators - or helical confinement devices - are fully three-dimensional in contrast to the toroidal (rotational) symmetry of tokamaks. As stellarators can be free of an inductive current, whose radial distribution depends on the plasma parameters, their equilibrium must not be established via the evolving plasma itself, but to a first order already given by the vacuum magnetic field. They do not need an active control (like positional feedback) and therefore cannot suffer from its failure. The outstanding conceptual advantage of stellarators is the potential of steady state plasma operation without current drive. As there is no need for current drive, the recirculating power is expected to be smaller than in equivalent tokamaks. The lack of a net current avoids current driven instabilities; specifically, no disruptions, no resistive wall modes and no conventional or neoclassical tearing modes
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Beidler, C;
Brakel, R;
Burhenn, R;
Dinklage, A;
Erckmann, V;
Feng, Y;
Geiger, J;
Hartmann, D;
Hirsch, M;
Jaenicke, R;
Koenig, R;
Laqua, H P;
Maassberg, H;
Wagner, F;
Weller, A;
Wobig, H
[1]
- Max-Planck Institut fuer Plasmaphysik, EURATOM Association, Greifswald (Germany)
Citation Formats
Beidler, C, Brakel, R, Burhenn, R, Dinklage, A, Erckmann, V, Feng, Y, Geiger, J, Hartmann, D, Hirsch, M, Jaenicke, R, Koenig, R, Laqua, H P, Maassberg, H, Wagner, F, Weller, A, and Wobig, H.
Helical Confinement Concepts.
IAEA: N. p.,
2012.
Web.
Beidler, C, Brakel, R, Burhenn, R, Dinklage, A, Erckmann, V, Feng, Y, Geiger, J, Hartmann, D, Hirsch, M, Jaenicke, R, Koenig, R, Laqua, H P, Maassberg, H, Wagner, F, Weller, A, & Wobig, H.
Helical Confinement Concepts.
IAEA.
Beidler, C, Brakel, R, Burhenn, R, Dinklage, A, Erckmann, V, Feng, Y, Geiger, J, Hartmann, D, Hirsch, M, Jaenicke, R, Koenig, R, Laqua, H P, Maassberg, H, Wagner, F, Weller, A, and Wobig, H.
2012.
"Helical Confinement Concepts."
IAEA.
@misc{etde_22028538,
title = {Helical Confinement Concepts}
author = {Beidler, C, Brakel, R, Burhenn, R, Dinklage, A, Erckmann, V, Feng, Y, Geiger, J, Hartmann, D, Hirsch, M, Jaenicke, R, Koenig, R, Laqua, H P, Maassberg, H, Wagner, F, Weller, A, and Wobig, H}
abstractNote = {Stellarators, conceived 1951 by Lyman Spitzer in Princeton, are toroidal devices that confine a plasma in a magnetic field which originates from currents in coils outside the plasma. A plasma current driven by external means, for example by an ohmic transformer, is not required for confinement. Supplying the desired poloidal field component by external coils leads to a helically structured plasma topology. Thus stellarators - or helical confinement devices - are fully three-dimensional in contrast to the toroidal (rotational) symmetry of tokamaks. As stellarators can be free of an inductive current, whose radial distribution depends on the plasma parameters, their equilibrium must not be established via the evolving plasma itself, but to a first order already given by the vacuum magnetic field. They do not need an active control (like positional feedback) and therefore cannot suffer from its failure. The outstanding conceptual advantage of stellarators is the potential of steady state plasma operation without current drive. As there is no need for current drive, the recirculating power is expected to be smaller than in equivalent tokamaks. The lack of a net current avoids current driven instabilities; specifically, no disruptions, no resistive wall modes and no conventional or neoclassical tearing modes appear. Second order pressure-driven currents (Pfirsch-Schlueter, bootstrap) exist but they can be modified and even minimized by the magnetic design. The magnetic configuration of helical devices naturally possesses a separatrix, which allows the implementation of a helically structured divertor for exhaust and impurity control. (author)}
place = {IAEA}
year = {2012}
month = {Sep}
}
title = {Helical Confinement Concepts}
author = {Beidler, C, Brakel, R, Burhenn, R, Dinklage, A, Erckmann, V, Feng, Y, Geiger, J, Hartmann, D, Hirsch, M, Jaenicke, R, Koenig, R, Laqua, H P, Maassberg, H, Wagner, F, Weller, A, and Wobig, H}
abstractNote = {Stellarators, conceived 1951 by Lyman Spitzer in Princeton, are toroidal devices that confine a plasma in a magnetic field which originates from currents in coils outside the plasma. A plasma current driven by external means, for example by an ohmic transformer, is not required for confinement. Supplying the desired poloidal field component by external coils leads to a helically structured plasma topology. Thus stellarators - or helical confinement devices - are fully three-dimensional in contrast to the toroidal (rotational) symmetry of tokamaks. As stellarators can be free of an inductive current, whose radial distribution depends on the plasma parameters, their equilibrium must not be established via the evolving plasma itself, but to a first order already given by the vacuum magnetic field. They do not need an active control (like positional feedback) and therefore cannot suffer from its failure. The outstanding conceptual advantage of stellarators is the potential of steady state plasma operation without current drive. As there is no need for current drive, the recirculating power is expected to be smaller than in equivalent tokamaks. The lack of a net current avoids current driven instabilities; specifically, no disruptions, no resistive wall modes and no conventional or neoclassical tearing modes appear. Second order pressure-driven currents (Pfirsch-Schlueter, bootstrap) exist but they can be modified and even minimized by the magnetic design. The magnetic configuration of helical devices naturally possesses a separatrix, which allows the implementation of a helically structured divertor for exhaust and impurity control. (author)}
place = {IAEA}
year = {2012}
month = {Sep}
}