Application of TFTR diagnostics to study of limiter H-modes

C. E. Bush, J. Schivell, G. Taylor, N. Bretz, A. Cavallo, E. Fredrickson, A. Janos, D. K. Mansfield, K. McGuire, R. Nazikian, H. Park, A. T. Ramsey, B. Stratton, E. J. Synakowski

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Circular limiter H modes with centrally peaked density profiles have been obtained on TFTR. Diagnostics used to study these unique plasmas include arrays of Dα and Cii detectors, bolometers, and Mirnov coils; x-ray imaging, charge exchange recombination spectroscopy, ECE, microwave scattering systems, and a multichannel infrared interferometer. These diagnostics have special features which allow time and space-resolved measurements during the H-mode transition and during ELMs. Microwave scattering during the H phase shows a feature in the scattered spectrum which is consistent with a poloidal rotation in the electron diamagnetic drift direction. Mirnov coil data digitized at 2 MHz show an increase in high-frequency magnetic fluctuations (60-200 kHz) during an ELM, while ECE data show 20-30 μs intense emission spikes in the outer 15-20 cm of the plasma edge.

Original languageEnglish
Pages (from-to)3532-3535
Number of pages4
JournalReview of Scientific Instruments
Volume61
Issue number11
DOIs
StatePublished - 1990

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