Effect of wall boundary on the scrape-off layer losses of high harmonic fast wave in NSTX and NSTX-U

Kim, Eun -Hwa; Bertelli, Nicola; Ono, Masayuki; Valeo, Ernest J.; Hosea, Joel C.; Perkins, Rory J.

doi:10.1063/1.5091579

Effect of wall boundary on the scrape-off layer losses of high harmonic fast wave in NSTX and NSTX-U

Journal Article · Tue Jun 04 00:00:00 EDT 2019 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5091579· OSTI ID:1559005

^[1]; ^[1]; ^[1]; Valeo, Ernest J. ^[1]; Hosea, Joel C. ^[1]; ^[1]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

We perform numerical simulations of high harmonic fast waves (HHFWs) in the scrape-off-layer (SOL) of National Spherical Torus Experiment (NSTX)/NSTX-U using a recently developed 2D full wave code. We particularly show that a realistic NSTX SOL boundary can significantly affect HHFW propagation and power losses in the SOL. In NSTX SOL boundaries, HHFW is easily localized near the antenna and propagates less to the SOL, and thus, less power is lost to the SOL. Here, we also show that the lower SOL power losses occur when the SOL volume is smaller and the distance between the last closed flux surface and the antenna is shorter. We investigate the effect of electron density in front of the antenna and the ambient magnetic field strengths on the SOL power losses as well. Showing consistency with the experiments, SOL losses are minimized when the SOL density is near the critical density where the fast wave cutoff is open, and the plasma is strongly magnetized.

View Accepted Manuscript (DOE)

Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 1559005

Alternate ID(s):: OSTI ID: 1524457

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 6 Vol. 26; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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