Publication

Observation of multiple kinetic Alfven eigenmodes

Ambrogio Fasoli, Jonathan Bryan Lister, Laurent Villard, Jean-Marc Moret
1996
Journal Articles

Abstract

Multiple weakly damped Alfven eigenmodes (AE) have been excited and detected by means of a dedicated active diagnostic in JET tokamak plasmas heated by ion cyclotron resonance heating, neutral beam injection heating, lower hybrid heating. and high plasma current Ohmic heating. This phenomenon is interpreted in terms of a new class of AE, the kinetic AE. predicted in theoretical models which include finite Larmor radius and toroidicity effects.

Official source

https://infoscience.epfl.ch/entities/publication/21495627-9380-4680-8593-620727bf1173

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Ambrogio Fasoli, Jonathan Bryan Lister, Laurent Villard, Jean-Marc Moret
1996
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/21495627-9380-4680-8593-620727bf1173

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.

Neutral-beam injection

Neutral-beam injection (NBI) is one method used to heat plasma inside a fusion device consisting in a beam of high-energy neutral particles that can enter the magnetic confinement field. When these neutral particles are ionized by collision with the plasma particles, they are kept in the plasma by the confining magnetic field and can transfer most of their energy by further collisions with the plasma. By tangential injection in the torus, neutral beams also provide momentum to the plasma and current drive, one essential feature for long pulses of burning plasmas.

Ion cyclotron resonance

Ion cyclotron resonance is a phenomenon related to the movement of ions in a magnetic field. It is used for accelerating ions in a cyclotron, and for measuring the masses of an ionized analyte in mass spectrometry, particularly with Fourier transform ion cyclotron resonance mass spectrometers. It can also be used to follow the kinetics of chemical reactions in a dilute gas mixture, provided these involve charged species. An ion in a static and uniform magnetic field will move in a circle due to the Lorentz force.

Related publications (32)

Observation of multiple kinetic Alfven eigenmodes

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Study of the fast-ion confinement via velocity-space resolved measurements in several plasma scenarios in the TCV tokamak

First observations of ion cyclotron emission in the TCV tokamak

Design and Commissioning of Control Algorithms for Optimal ECRH Power Injection in TCV’s Plasma