Central mass and current density measurements in Tokamaks using the discrete Alfven wave spectrum

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Central mass and current density measurements in Tokamaks using the discrete Alfven wave spectrum

Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/231671

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Title: Central mass and current density measurements in Tokamaks using the discrete Alfven wave spectrum
Author(s): Collins, G. A.; Howling, A. A.; Lister, J. B.; Marmillod, P.
Abstract: The spectrum of global eigenmodes of the Alfven wave omega < omega ci offers the possibility of a very simple method for diagnosing the centre of a Tokamak plasma. The frequencies of these modes depend on the central mass density and the current profile, and can be adequately estimated by MHD theory in cylindrical geometry including ion cyclotron effects. A simple unshielded bar antenna has been used to launch the waves at a power level of a few watts, detected by magnetic field probes in the boundary layer. Applications investigated on the TCA and PETULA Tokamaks include estimates of the core current density over a wide variety of discharges, measurements of changes of the effective mass during impurity puffing and the observation of profile changes during sawtooth activity. A method for the measurement of the deuterium-tritium ratio in a Tokamak is proposed.
Publication type: Journal article
Source: Plasma Physics and Controlled Fusion, Vol. 29, no. 3 (Mar 1987), pp. 323-339
Publication year: 1987
FOR Code(s): 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
Keyword(s): Alfven wave; Instrumentation; Measurement; Plasma physics; Tokamak plasma
Publisher: Institute of Physics Publishing
ISSN: 0741-3335
Publisher URL: http://dx.doi.org/10.1088/0741-3335/29/3/004
Peer reviewed