Publication

Modelling of Alfven waves in JET plasmas with the CASTOR-K code

Ambrogio Fasoli
2002
Journal Articles

Abstract

A hybrid magnetohydrodynamic (M H D)-gyro-kinetic model CASTOR-K developed for the study of Alfven eigenmode (AE) stability in the presence of energetic ions has been applied to the interpretation of recent measurements of Alfven waves in JET. These include the detailed AE damping measurements performed using the AE antenna excitation system and also the observations of Alfven cascades in strongly reversed shear scenarios at JET. The mode conversion between the AEs and kinetic Alfven waves and the relation to the Alfven continuum is studied and the calculated damping is compared with the experimental data. The contribution of ion cyclotron resonant heating driven minority ions to the growth rate of the novel-type mode localized around the point of zero magnetic shear is calculated. This mode is shown to be clearly linked to the ideal MHD 'Alfven continuum', computed with the CSCAS code and consistent with the observation of a quasi-periodic pattern of upward frequency sweeping Alfven cascades in JET.

Official source

https://infoscience.epfl.ch/entities/publication/a39424eb-6f17-4728-a229-37e8ab39c427

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Ambrogio Fasoli
2002
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/a39424eb-6f17-4728-a229-37e8ab39c427

About this result

Related concepts (32)

Magnetic reconnection

Magnetic reconnection is a physical process occurring in electrically conducting plasmas, in which the magnetic topology is rearranged and magnetic energy is converted to kinetic energy, thermal energy, and particle acceleration. Magnetic reconnection involves plasma flows at a substantial fraction of the Alfvén wave speed, which is the fundamental speed for mechanical information flow in a magnetized plasma. The concept of magnetic reconnection was developed in parallel by researchers working in solar physics and in the interaction between the solar wind and magnetized planets.

Magnetohydrodynamics

Magnetohydrodynamics (MHD; also called magneto-fluid dynamics or hydromagnetics) is a model of electrically conducting fluids that treats all interpenetrating particle species together as a single continuous medium. It is primarily concerned with the low-frequency, large-scale, magnetic behavior in plasmas and liquid metals and has applications in numerous fields including geophysics, astrophysics, and engineering. The word magnetohydrodynamics is derived from magneto- meaning magnetic field, hydro- meaning water, and dynamics meaning movement.

Alfvén wave

In plasma physics, an Alfvén wave, named after Hannes Alfvén, is a type of plasma wave in which ions oscillate in response to a restoring force provided by an effective tension on the magnetic field lines. An Alfvén wave is a low-frequency (compared to the ion gyrofrequency) travelling oscillation of the ions and magnetic field in a plasma. The ion mass density provides the inertia and the magnetic field line tension provides the restoring force.

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Modelling of Alfven waves in JET plasmas with the CASTOR-K code

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