Publication

Identification of the ubiquitous Coriolis momentum pinch in JET tokamak plasmas

Henri Weisen, Yann Camenen, Mikhail Maslov
2012
Journal Articles

Abstract

A broad survey of the experimental database of neutral beam heated plasmas in the JET tokamak has established the theoretically expected ubiquity, in rotating plasmas, of a convective transport mechanism which has its origin in the vertical particle drift resulting from the Coriolis force. This inward convection, or pinch, leads to inward transport of toroidal angular momentum and is characterized by pinch numbers RV/chi(phi), which rise from near unity at r/a approximate to 0.25 to around 5 at r/a approximate to 0.85. Linear gyrokinetic calculations of the Coriolis pinch number and the Prandtl number chi(phi)/chi(i) are in good agreement with the experimental observations, with similar dependences on plasma parameters. The data, however, do not rule out contributions from different processes, such as residual stresses.

Official source

https://infoscience.epfl.ch/entities/publication/242f992c-8d77-4b21-b8e4-fe25777c59e1

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Henri Weisen, Yann Camenen, Mikhail Maslov
2012
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/242f992c-8d77-4b21-b8e4-fe25777c59e1

About this result

Related concepts (32)

Tokamak

A tokamak (ˈtoʊkəmæk; токамáк) is a device which uses a powerful magnetic field to confine plasma in the shape of a torus. The tokamak is one of several types of magnetic confinement devices being developed to produce controlled thermonuclear fusion power. , it was the leading candidate for a practical fusion reactor. Tokamaks were initially conceptualized in the 1950s by Soviet physicists Igor Tamm and Andrei Sakharov, inspired by a letter by Oleg Lavrentiev. The first working tokamak was attributed to the work of Natan Yavlinsky on the T-1 in 1958.

Spherical tokamak

A spherical tokamak is a type of fusion power device based on the tokamak principle. It is notable for its very narrow profile, or aspect ratio. A traditional tokamak has a toroidal confinement area that gives it an overall shape similar to a donut, complete with a large hole in the middle. The spherical tokamak reduces the size of the hole as much as possible, resulting in a plasma shape that is almost spherical, often compared to a cored apple. The spherical tokamak is sometimes referred to as a spherical torus and often shortened to ST.

Plasma stability

The stability of a plasma is an important consideration in the study of plasma physics. When a system containing a plasma is at equilibrium, it is possible for certain parts of the plasma to be disturbed by small perturbative forces acting on it. The stability of the system determines if the perturbations will grow, oscillate, or be damped out. In many cases, a plasma can be treated as a fluid and its stability analyzed with magnetohydrodynamics (MHD).

Related publications (32)

Identification of the ubiquitous Coriolis momentum pinch in JET tokamak plasmas

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