Local scrape-off layer control using biased electrodes in NSTX

Journal Article · Wed Dec 31 23:00:00 EST 2008 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/0741-3335/51/10/105012· OSTI ID:1019003

Zweben, S. J. ^[1]; Maqueda, R. J. ^[2]; Roquemore, A. L. ^[1]; Bush, C. E. ^[3]; Kaita, R. ^[1]; Marsala, R. ^[1]; Raitses, Y ^[1]; Cohen, Ronald H. ^[4]; Ryutov, D D ^[4]

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1. Princeton Plasma Physics Laboratory (PPPL)
2. Nova Photonics, Princeton, NJ
3. Oak Ridge National Laboratory (ORNL)
4. Lawrence Livermore National Laboratory (LLNL)

An experiment on the National Spherical Torus Experiment (NSTX) was designed to test the theory that biased electrodes can affect the local scrape-off layer (SOL) by creating a strong radial E x B flow (Cohen and Ryutov 1997 Nucl. Fusion 37 621). These electrodes were located near the outer midplane and were biased at up to +/-90V with respect to the local vacuum vessel ground. This biasing caused large changes in the local SOL profiles as measured by an array of Langmuir probes between the electrodes. A theory is presented which at least partially describes the experimental results.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1019003
• Journal Information: Plasma Physics and Controlled Fusion, Journal Name: Plasma Physics and Controlled Fusion Journal Issue: 10 Vol. 51; ISSN 0741-3335
• Country of Publication: United States
• Language: English