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 (tô′kə-măk′, tŏk′ə-)
A doughnut-shaped chamber used in fusion research in which a plasma is heated and confined by magnetic fields.

[Russian, from to(roidal'naya) kam(era s) ak(sial'nym magnitnym polem), toroidal chamber with axial magnetic field.]


(General Physics) physics a toroidal reactor used in thermonuclear experiments, in which a strong helical magnetic field keeps the plasma from contacting the external walls. The magnetic field is produced partly by current-carrying coils and partly by a large inductively driven current through the plasma
[C20: from Russian to(roidál'naya) kám(era s) ak(siál'nym magnitnym pólem), toroidal chamber with magnetic field]


(ˈtoʊ kəˌmæk, ˈtɒk ə-)

a type of experimental nuclear fusion reactor in which a plasma of ions circulates in a toroidal tube and is confined to a narrow beam by an electromagnetic field.
[1960–65; < Russian tokamák, for to(roidál'naya) kám(era s) ak(siál'nym magnítnym pólem) toroidal chamber with an axial magnetic field]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.tokamak - a doughnut-shaped chamber used in fusion research; a plasma is heated and confined in a magnetic bottle
chamber - a natural or artificial enclosed space
magnetic bottle - container consisting of any configuration of magnetic fields used to contain a plasma during controlled thermonuclear reactions
References in periodicals archive ?
First, the mainline international fusion research program is focused on the tokamak plasma confinement concept, which is the basis of the extremely expensive International Thermonuclear Experimental Reactor (ITER)--with a price tag on the order of $50 billion--that is currently under construction in France, with international funding.
The Russian tokamak plasma confinement breakthrough of the mid to late 60s began a world trend toward that magnetic configuration.
However, decades ago the world fusion community decided that the most promising magnetic approach was the tokamak plasma confinement concept in which superconducting magnets are used to hold hot fusion plasma in a toroidal (donut) configuration.
Within the framework of the Beacon Project, teams from the NICS at the University of Tennessee used the early-access version to assist in the optimization process for a number of different codes, including the kinetic model of computational fluid dynamics and the Gyro tokamak plasma simulation.