Tokamaks in a sentence

Advanced tokamaks Since about 1990 tokamaks are designed to operate in high-confinement mode to reduce plasma and energy losses.

In most stellarators, these changes in field strength are greater than in tokamaks, which is a major reason that transport in stellarators tends to be higher than in tokamaks.

But stellarators have long been unable to hold in the heat as well as tokamaks, which have similar magnetic fields.

Unlike other tokamaks, the metal donut that houses the MST plasmas is thick and highly conducting, allowing for more stable operation.

Advanced or 2nd generation tokamaks generally use a 'C' or 'D' shaped plasma cross-section.

A general measure of magnetic trapping in fusion is the beta ratio: Wesson, J: "Tokamaks", 3rd edition page 115, Oxford University Press, 2004 This is the ratio of the externally applied field to the internal pressure of the plasma.

Although they also have a toroidal magnetic field topology, stellarators are distinct from tokamaks in that they are not azimuthally symmetric.

Currently tokamaks weigh a great deal, so the thrust to weight ratio would seem unacceptable.

In Tokamaks, the Tore Supra was under construction over the middle of the eighties (1983 to 1988).

In Tokamaks, this can be done using mirrors and detectors to reflect light across a plane (two dimensions) or in a line (one dimension).

It might be possible to use these additional degrees of design freedom to optimize a stellarator in ways that are not possible with tokamaks.

Neoclassical tearing modes are also stabilized with the appropriate relative signs of the bootstrap current and the magnetic shear; this prediction is supported by the absence of NTMs in central negative shear regions of tokamaks.

Opportunities to test these predictions are provided by configurations such as the ST, spheromak, and FRC, which have a large natural diamagnetic rotation, as well as tokamaks with rotation driven by neutral beam injection.

The A.D. Sakharov group constructed the first tokamaks, the most successful being the T-3 and its larger version T-4.

The extensive beta limit database for tokamaks is consistent with ideal MHD stability limits, yielding agreement to within about 10% in beta for cases where the internal profiles of the plasma are accurately measured.

The group constructed the first tokamaks, the most successful being T-3 and its larger version T-4.

The occurrence of major disruptions in running tokamaks has always been rather high, of the order of a few percent of the total numbers of the shots.

This would be easier with some confinement schemes (e.g. magnetic mirrors ) than with others (e.g. tokamaks ).

Tokamaks must therefore either operate for short periods or rely on other means of heating and current drive.

Wesson, J: "Tokamaks", 3rd edition page 115, Oxford University Press, 2004 MHD stability at high beta is crucial for a compact, cost-effective magnetic fusion reactor.