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High-Harmonic Fast-Wave Driven H-Mode Plasmas in NSTX

Authors: LeBlanc, B. P.; Bell, R. E.; Bernabei, S. I.; Indireshkumar, K.; Kaye, S. M.; Maingi, R.; Mau, T. K.; +5 Authors

High-Harmonic Fast-Wave Driven H-Mode Plasmas in NSTX

Abstract

The launch of High‐Harmonic Fast Waves (HHFW) routinely provides auxiliary power to NSTX plasmas, where it is used to heat electrons and pursue drive current. H‐mode transitions have been observed in deuterium discharges, where only HHFW and ohmic heating, and no neutral beam injection (NBI), were applied to the plasma. The usual H‐mode signatures are observed. A drop of the Dα light marks the start of a stored energy increase, which can double the energy content. These H‐mode plasmas also have the expected kinetic profile signatures with steep edge density and electron temperature pedestal. Similar to its NBI driven counterpart — also observed on NSTX — the HHFW H mode has density profiles that feature “ears” in the peripheral region. These plasmas are likely candidates for long pulse operation because of the combination of bootstrap current, associated with H‐mode kinetic profiles, and active current drive, which can be generated with HHFW power.

Country
United States
Keywords

Heating, Kinetics, Plasma, Auditory Organs, Bootstrap Current, Stored Energy, Beam Injection, Electron Temperature, Electrons, 70 Plasma Physics And Fusion Technology, Deuterium

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citations
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
Average
Average
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Energy Research