Local Scrape-Off Layer Control Using Biased electrodes in NSTX

Zweben, S J; Maqueda, R J; Roquemore, A L; Bush, C E; Kaita, R; Marsala, R J; Raitses, Y; Cohen, R H; Ryutov, D D

doi:10.1088/0741-3335/51/10/105012

Local Scrape-Off Layer Control Using Biased electrodes in NSTX

Journal Article · Tue Jun 23 00:00:00 EDT 2009 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/0741-3335/51/10/105012· OSTI ID:970671

Zweben, S J; Maqueda, R J; Roquemore, A L; Bush, C E; Kaita, R; Marsala, R J; Raitses, Y; Cohen, R H; Ryutov, D D

An experiment was designed to test the theory that biased electrodes can affect the local scrape-off layer (SOL) width by creating a strong radial ExB drift [Cohen, R.H. and Ryutov, D.D, Nucl. Fusion 37, 621 (1997)]. These electrodes were located near the outer midplane in the SOL of the National Spherical Torus Experiment (NSTX). The electrodes were biased at up to {+-} 100 Volts, and the radial profile of the plasma between them was measured by an array of Langmuir probes. The biasing caused large changes in the local SOL profiles at least qualitatively consistent with this theory.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA

Sponsoring Organization:: USDOE

DOE Contract Number:: W-7405-ENG-48

OSTI ID:: 970671

Report Number(s):: LLNL-JRNL-414426

Journal Information:: Plasma Physics and Controlled Fusion, Journal Name: Plasma Physics and Controlled Fusion Journal Issue: 10 Vol. 51; ISSN PPCFET; ISSN 0741-3335

Country of Publication:: United States

Language:: English

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
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