tokamak

to·ka·mak

(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.]

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

tokamak

(ˈtɒkəˌmæk)

(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]

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

to•ka•mak

(ˈtoʊ kəˌmæk, ˈtɒk ə-)

n.

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:

Noun

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

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References in periodicals archive

As of June 2015, the United States has invested $751 million in the International Thermonuclear Experimental Reactor (ITER) tokamak project.

Keeping fusion flexible

Ohkawa proposed building a major new tokamak at General Atomics called Doublet III.

Fusion Pioneer tihiro ohkawa passes, Age 86

where [psi](r, t) denotes the poloidal magnetic-flux around the tokamak; r denotes the normalized radius; t denotes time; U(t) denotes the control variable acting at the right ending; D(r, t) is divergent-type transport coefficient (which can be identified from the experimental data); [eta](r,t) is the resistivity; and j(r, t) is the noninductive current source.

Optimal tracking for a divergent-type parabolic PDE system in current profile control

In this paper, the mechanism of the transition from L-mode to H-mode in Tokamak is an important and difficult problem.

The dynamic mutation characteristics of thermonuclear reaction in Tokamak

The patented tokamak is surrounded by an area that would house a nuclear waste fuel source and waste byproducts of the nuclear fuel cycle.

Three University of Texas physicists awarded patent for nuclear waste invention

Tokamak is short for Toroidal Kamera Magnitnaya, invented in the Soviet Union during the 1950s.

Theory of Tokamak Transport: New Aspects for Nuclear Fusion Reactor Design

Researchers will try to reach at least 10 million watts before the TFTR is shut down and dismantled, an operation scheduled to start at the end of September to make way for an advanced fusion reactor known as the Tokamak Physics Experiment.

New heights in fusion power

While scientists have created controlled fusion reactions in small-scale experiments, tritium and deuterium, the optimum hydrogen fuels, have not yet been tested in a large Tokamak. Initial experiments are scheduled to occur in the next few years in the United States, Europe, and the Soviet Union.

Assessing the future of fusion