Noninductive plasma initiation and startup in the DIII-D tokamak

Noninductive plasma startup with second harmonic electron cyclotron heating has been studied in DIII-D. Plasma currents up to 33 kA have been obtained in this phase. The maximum current obtained was primarily limited by the experimental time and does not necessarily represent the highest achievable...

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Bibliographic Details
Published in:Nuclear fusion 2011-08, Vol.51 (8), p.83015-9
Main Authors: Jackson, G.L., Humphreys, D.A., Hyatt, A.W., Lohr, J.M., Luce, T.C., Yu, J.H.
Format: Article
Language:English
Subjects:
Combustion
Devices
Electron cyclotron heating
Flux
Nuclear fusion
Plasma currents
Ramps
Tokamak devices
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Summary:Noninductive plasma startup with second harmonic electron cyclotron heating has been studied in DIII-D. Plasma currents up to 33 kA have been obtained in this phase. The maximum current obtained was primarily limited by the experimental time and does not necessarily represent the highest achievable current. The dominant physical mechanism for the observed current is the Pfirsch–Schlüter current on open field lines. Closed flux surfaces have been observed, but in a rather limited region, compared with previous experiments in spherical tokamaks. This method of plasma initiation and initial current ramp might be used in future burning plasma devices in conjunction with other current drive techniques to provide a fully noninductive startup.
ISSN:0029-5515
1741-4326
DOI:10.1088/0029-5515/51/8/083015