High harmonic fast wave propagation in the scrape-off layer of NSTX and NSTX-U

POSTER

Abstract

We perform simulations using a 2D full-wave (FW2D) code for high harmonic fast wave (HHFW) in the scrape-off layer (SOL), the region of the plasma between the last closed flux surface (LCFS) and the tokamak vacuum vessel, of NSTX and NSTX-U. The SOL is important for HHFW heating because up to 60% of the coupled power can be lost in the SOL. In this presentation, we examine the collisional power losses in the SOL (Pabs) by adopting various values of the electron density in front of antenna (Nant), the magnetic field strength (B0) as well as the distance between the LCFS and the antenna (Δ). The results clearly show that Pabs increases with increasing Nant, and/or weaker B0, showing consistency with NSTX experiments. We also found that vessel shape strongly affects the power lost to the SOL, hence Pabs increases when Δ increases. We also examine the HHFW in the NSTX/NSTX-U using recently developed Petra-M code and compare with the results from FW2D.

Presenters

  • Eun-Hwa Kim

    Princeton Plasma Physics Laboratory, Princeton University, Princeton Plasma Phys Lab

Authors

  • Eun-Hwa Kim

    Princeton Plasma Physics Laboratory, Princeton University, Princeton Plasma Phys Lab

  • N. Bertelli

    Princeton Plasma Physics Laboratory, Princeton University, Princeton Plasma Phys Lab, PPPL

  • Joel C. Hosea

    Princeton Plasma Physics Laboratory, Princeton University

  • Ernie J. Valeo

    Princeton Plasma Physics Laboratory, Princeton University, Princeton Plasma Phys Lab

  • Rory James Perkins

    Princeton Plasma Physics Laboratory, Princeton University, Princeton Plasma Phys Lab, Princeton Plasma Physics Laboratory

  • S. Shiraiwa

    Massachusetts Inst of Tech-MIT, Plasma Science and Fusion Center, Massachusetts Institute of Technology, MIT, MIT PSFC

  • John C Wright

    MIT PSFC, Plasma Science and Fusion Center, Massachusetts Institute of Technology, Massachusetts Inst of Tech-MIT