Specific microfluctuations associated with sawtooth relaxation in tokamak plasmas
In the TFR Tokamak bursts of density fluctuations are observed which coincide in space and time with the sawtooth disruptions of the plasma. These are measured with a CO(2) laser scattering experiment. The temporal evolution of the soft X-ray signal and the scattered light signal is analysed. The dispersive properties, localisation and amplitude data of these fluctuations are discussed. These observations demonstrate the existence of a specific turbulence in the disruption phenomenon. An m=1 kink-like instability and a specific turbulence associated with a new helical shape of the plasma are two experimentally proven aspects of the sawtooth relaxation phenomenon. They are probably two key elements of its mechanism.
Bibliographic Reference: Article: Plasma Physics and Controlled Fusion, Vol, 31 (1989), N0. 4, pp. 643-649
Record Number: 198910576 / Last updated on: 1994-12-01
Original language: en
Available languages: en