Self-sustained divertor oscillations in ASDEX Upgrade

Alternating radiation phenomena between the inner and outer divertor regions in the sub kHz range are investigated in the tokamak ASDEX Upgrade. While the inner divertor oscillates between the onset and fluctuating state of detachment, the outer divertor oscillates between conditions where it can ma...

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Bibliographic Details
Published in:Nuclear fusion 2020-07, Vol.60 (7), p.76013
Main Authors: Heinrich, P., Manz, P., Bernert, M., Birkenmeier, G., Brida, D., Cavedon, M., David, P., Griener, M., Haas, G., Happel, T., Plank, U., Reimold, F., Stroth, U., Wischmeier, M., Zhang, W.
Format: Article
Language:English
Subjects:
detachment
divertor
divertor oscillations
magnetically confined plasma
neutral flux through PFR
scrape-off layer
tokamak
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Summary:Alternating radiation phenomena between the inner and outer divertor regions in the sub kHz range are investigated in the tokamak ASDEX Upgrade. While the inner divertor oscillates between the onset and fluctuating state of detachment, the outer divertor oscillates between conditions where it can maintain high recycling conditions or not. The detachment state of the inner divertor determines the magnitude of the neutral flux through the private flux region, thus sets the recycling conditions at the outer divertor. In return these recycling conditions determine the particle content in the divertor, hence the detachment state at the inner divertor.
ISSN:0029-5515
1741-4326
DOI:10.1088/1741-4326/ab8a05