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Limiter H-mode experiments on TFTR

Authors: Bush; C. E. (Oak Ridge National Lab.; TN (USA)); Bretz, N. L.; Fredrickson, E. D.; McGuire, K. M.; Nazikian, R.; +25 Authors

Limiter H-mode experiments on TFTR

Abstract

Limiter H-modes with centrally peaked density profiles have been obtained in TFTR using a highly conditioned graphite limiter. The transition to these centrally peaked H-modes takes place from the supershot to the H-mode rather than the usual L- to H-mode transition observed on other tokamaks. Bidirectional beam heating is required to induce the transition. Density peaking factors, n{sub e}(0)/, greater than 2.3 are obtained and at the same time the H-mode characteristics are similar to those of limiter H-modes on other tokamaks, while the global confinement, {tau}{sub E}, can be >2.5 times L-mode scaling. The transport analysis of the data shows that transport in these H-modes is similar to that of supershots within the inner 0.6 m core of the plasma, but the stored electron energy (calculated using measured values of T{sub e} and n{sub e}) is higher for the H-mode at the plasma edge. Microwave scattering data for the edge plasma shows broad spectra at k = 5.5 cm{sup {minus}1} which begin at the drop in D{sub {alpha}} radiation and are strongly shifted in the electron diamagnetic drift direction. At the same time, beam emission spectroscopy (BES) shows a coherent mode near the boundary which propagates in the ionmore » direction with m = 15--20 at 20--30 kHz. During the ELM event these apparent rotations cease and Mirnov fluctuations in the frequency range of 50--500 kHz increase in intensity. 16 refs., 8 figs.« less

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United States
Keywords

Minerals, Limiters, Tokamak Type Reactors, Elemental Minerals, Thermonuclear Reactors, H-Mode Plasma Confinement, & Production, Elements, Variations 700101* -- Fusion Energy-- Plasma Research-- Confinement, Carbon, Plasma Heating, Heating, Magnetic Fields, Nonmetals, Tftr Tokamak, Plasma Confinement, Fluctuations, 700209 -- Fusion Power Plant Technology-- Component Development & Materials Testing, Graphite, 70 Plasma Physics And Fusion Technology, Confinement Time, Beam Injection Heating, Confinement

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
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