title: High-harmonic fast-wave power flow along magnetic field lines in the scrape-off layer of NSTX.
abstract: 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.
authors.affiliation: Princeton Plasma Physics Laboratory, Princeton, New Jersey, USA. rperkins@pppl.gov
authors.forename: R J
authors.initials: RJ
authors.lastname: Perkins
authors.forename: J C
authors.initials: JC
authors.lastname: Hosea
authors.forename: G J
authors.initials: GJ
authors.lastname: Kramer
authors.forename: J-W
authors.initials: JW
authors.lastname: Ahn
authors.forename: R E
authors.initials: RE
authors.lastname: Bell
authors.forename: A
authors.initials: A
authors.lastname: Diallo
authors.forename: S
authors.initials: S
authors.lastname: Gerhardt
authors.forename: T K
authors.initials: TK
authors.lastname: Gray
authors.forename: D L
authors.initials: DL
authors.lastname: Green
authors.forename: E F
authors.initials: EF
authors.lastname: Jaeger
authors.forename: M A
authors.initials: MA
authors.lastname: Jaworski
authors.forename: B P
authors.initials: BP
authors.lastname: LeBlanc
authors.forename: A
authors.initials: A
authors.lastname: McLean
authors.forename: R
authors.initials: R
authors.lastname: Maingi
authors.forename: C K
authors.initials: CK
authors.lastname: Phillips
authors.forename: L
authors.initials: L
authors.lastname: Roquemore
authors.forename: P M
authors.initials: PM
authors.lastname: Ryan
authors.forename: S
authors.initials: S
authors.lastname: Sabbagh
authors.forename: G
authors.initials: G
authors.lastname: Taylor
authors.forename: J R
authors.initials: JR
authors.lastname: Wilson