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Abstract

Enhanced density fluctuations with the rational q = 2 (iota = 0.5) surface are observed by a microwave reflectometer in currentless NBI heated discharges with pellet injection at an edge iota of 0.52. Radial scan of MHD activity locates coherent density fluctuations at r/a = 0.7. Frequency and amplitude are estimated. Correlation between the level of the local density turbulence and the iota value during iota modulation at 300 Hz leads to the conclusion that the local enhancement of the broadband density turbulence exists at the points where the rational iota values are crossed. A phase jump in the turbulence modulation occurs for r/a = 0.7, indicating the location of the resonant iota = 0.5 surface. The effect can be the basis of a new method to analyse the evolution of the iota profile inside the plasma, with interesting applications in current control experiments.

Additional information

Authors: SANCHEZ J, MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (DE);ASSOCIATION EURATOM/CIEMAT, MADRID (ES);INSTITUT FUER PLASMAFORSCHUNG DER UNIVERSITAET STUTTGART (DE);HARTFUSS H J ET AL, MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (DE);ASSOCIATION EURATOM/CIEMAT, MADRID (ES);INSTITUT FUER PLASMAFORSCHUNG DER UNIVERSITAET STUTTGART (DE);ANABITARTE E, MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (DE);ASSOCIATION EURATOM/CIEMAT, MADRID (ES);INSTITUT FUER PLASMAFORSCHUNG DER UNIVERSITAET STUTTGART (DE);NAVARRO A P, MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (DE);ASSOCIATION EURATOM/CIEMAT, MADRID (ES);INSTITUT FUER PLASMAFORSCHUNG DER UNIVERSITAET STUTTGART (DE);ECRH, MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (DE);ASSOCIATION EURATOM/CIEMAT, MADRID (ES);INSTITUT FUER PLASMAFORSCHUNG DER UNIVERSITAET STUTTGART (DE);GROUP MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (DE), MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (DE);ASSOCIATION EURATOM/CIEMAT, MADRID (ES);INSTITUT FUER PLASMAFORSCHUNG DER UNIVERSITAET STUTTGART (DE);ASSOCIATION EURATOM/CIEMAT, MADRID (ES), MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (DE);ASSOCIATION EURATOM/CIEMAT, MADRID (ES);INSTITUT FUER PLASMAFORSCHUNG DER UNIVERSITAET STUTTGART (DE);INSTITUT FUER PLASMAFORSCHUNG DER UNIVERSITAET STUTTGART (DE), MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING BEI MUENCHEN (DE);ASSOCIATION EURATOM/CIEMAT, MADRID (ES);INSTITUT FUER PLASMAFORSCHUNG DER UNIVERSITAET STUTTGART (DE)
Bibliographic Reference: REPORT: IPP 2/304 EN (1989) 27 PP. AVAILABLE FROM MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, 8046 GARCHING BEI MUENCHEN (DE)
Record Number: 1989128075300 / Last updated on: 1990-11-09
Category: PUBLICATION
Available languages: en