Application of TFTR diagnostics to study of limiter H -modes
- Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543 (USA)
Circular limiter {ital H} modes with centrally peaked density profiles have been obtained on TFTR. Diagnostics used to study these unique plasmas include arrays of {ital D}{sub {alpha}} and C II 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 {ital H}-mode transition and during ELMs. Microwave scattering during the {ital 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 {mu}s intense emission spikes in the outer 15--20 cm of the plasma edge.
- OSTI ID:
- 6311337
- Journal Information:
- Review of Scientific Instruments; (USA), Journal Name: Review of Scientific Instruments; (USA) Vol. 61:11; ISSN RSINA; ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
700102* -- Fusion Energy-- Plasma Research-- Diagnostics
CONFINEMENT
ELECTROMAGNETIC RADIATION
FLUCTUATIONS
H-MODE PLASMA CONFINEMENT
INELASTIC SCATTERING
IONIZING RADIATIONS
LIMITERS
MICROWAVE RADIATION
PLASMA CONFINEMENT
PLASMA DIAGNOSTICS
PLASMA RADIAL PROFILES
RADIATIONS
SCATTERING
SOFT X RADIATION
TFTR TOKAMAK
THERMONUCLEAR REACTORS
THOMSON SCATTERING
TOKAMAK TYPE REACTORS
VARIATIONS
X RADIATION