High-Harmonic Fast-Wave Power Flow Along Magnetic Field Lines in the Scrape-Off Layer of NSTX

Journal Article · Sun Jan 01 04:00:00 EST 2012 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.109.045001· OSTI ID:1048177

Perkins, R. J. ^[1]; Hosea, J. ^[1]; Kramer, G. ^[1]; Ahn, Joonwook ^[2]; Bell, R. E. ^[1]; Diallo, A. ^[1]; Gerhardt, S. ^[1]; Gray, T. K. ^[3]; Green, David L ^[2]; Jaeger, Erwin Frederick ^[2]; Jaworski, M. A. ^[1]; LeBlanc, B ^[1]; McLean, Adam G ^[2]; Maingi, Rajesh ^[2]; Phillips, C. K. ^[1]; Roquemore, L. ^[1]; Ryan, Philip Michael ^[2]; Sabbagh, S. A. ^[4]; Taylor, G. ^[1]; Wilson, J. R. ^[1]

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1. Princeton Plasma Physics Laboratory (PPPL)
2. ORNL
3. Oak Ridge National Laboratory (ORNL)
4. Columbia University

A significant fraction of high-harmonic fast-wave (HHFW) power applied to NSTX can be lost to the scrape-off layer (SOL) and deposited in bright and hot spirals on the divertor rather than in the core plasma. We show that the HHFW power flows to these spirals along magnetic field lines passing through the SOL in front of the antenna, implying that the HHFW power couples across the entire width of the SOL rather than mostly at the antenna face. This result will help guide future efforts to understand and minimize these edge losses in order to maximize fast-wave heating and current drive.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1048177
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 4 Vol. 109; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ANTENNAS
DIVERTORS
HEATING
MAGNETIC FIELDS
PLASMA
SOLS