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

Abstract

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.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [1];  [1]; ORCiD logo [1]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1559005
Alternate Identifier(s):
OSTI ID: 1524457
Grant/Contract Number:  
AC02-09CH11466; AT1030200
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 26; Journal Issue: 6; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Kim, Eun -Hwa, Bertelli, Nicola, Ono, Masayuki, Valeo, Ernest J., Hosea, Joel C., and Perkins, Rory J. Effect of wall boundary on the scrape-off layer losses of high harmonic fast wave in NSTX and NSTX-U. United States: N. p., 2019. Web. doi:10.1063/1.5091579.
Kim, Eun -Hwa, Bertelli, Nicola, Ono, Masayuki, Valeo, Ernest J., Hosea, Joel C., & Perkins, Rory J. Effect of wall boundary on the scrape-off layer losses of high harmonic fast wave in NSTX and NSTX-U. United States. doi:10.1063/1.5091579.
Kim, Eun -Hwa, Bertelli, Nicola, Ono, Masayuki, Valeo, Ernest J., Hosea, Joel C., and Perkins, Rory J. Tue . "Effect of wall boundary on the scrape-off layer losses of high harmonic fast wave in NSTX and NSTX-U". United States. doi:10.1063/1.5091579.
@article{osti_1559005,
title = {Effect of wall boundary on the scrape-off layer losses of high harmonic fast wave in NSTX and NSTX-U},
author = {Kim, Eun -Hwa and Bertelli, Nicola and Ono, Masayuki and Valeo, Ernest J. and Hosea, Joel C. and Perkins, Rory J.},
abstractNote = {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.},
doi = {10.1063/1.5091579},
journal = {Physics of Plasmas},
number = 6,
volume = 26,
place = {United States},
year = {2019},
month = {6}
}

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