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Intense bursts of non-thermal electron cyclotron emission (ECE) have been observed in H-mode (high confinement) discharges in the DIII-D tokamak [J. L. Luxon and L. G. Davis, Fusion Technol. 8,441 (1985)], measured with heterodyne radiometers and a broadband far infrared (FIR) detector. These bursts are triggered by edge-localized modes (ELMs) and consist of single or several spikes, most lasting 5-150 ÁS. Radiation temperatures reach up to several MeV. Observed spectral bandwidths are typically less than 4 GHz. Bandwidths as low as 500 MHz, which is the limit of the instrumental filter spacing, have been found. Statistical analysis shows a steady decrease of the number of spikes with rising spike energy. Burst frequencies seem to depend linearly on the magnetic field. It is speculated that the bursts are coherent second harmonic ECE.

Additional information

Authors: FUCHS C, Max-Planck-Institut f³r Plasmaphysik, EURATOM Association, Garching (DE);AUSTIN M.E, University of Texas, Austin (US)
Bibliographic Reference: An article published in: Physics of Plasmas. Vol.8, No.5 (2001), pp.1594-1599
Record Number: 200013478 / Last updated on: 2001-06-29
Original language: en
Available languages: en
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