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Title: Validation of full-wave simulations for mode conversion of waves in the ion cyclotron range of frequencies with phase contrast imaging in Alcator C-Mod

Abstract

Mode conversion of fast waves in the ion cyclotron range of frequencies (ICRF) is known to result in current drive and flow drive under optimised conditions, which may be utilized to control plasma profiles and improve fusion plasma performance. To describe these processes accurately in a realistic toroidal geometry, numerical simulations are essential. Quantitative comparison of these simulations and the actual experimental measurements is important to validate their predictions and to evaluate their limitations. The phase contrast imaging (PCI) diagnostic has been used to directly detect the ICRF waves in the Alcator C-Mod tokamak. The calculations have been compared with full-wave simulations through a synthetic diagnostic technique. Recently, the frequency response of the PCI detector array on Alcator C-Mod was recalibrated, which greatly improved the comparison between the measurements and the simulations. Here, mode converted waves for D-3He and D-H plasmas with various ion species compositions were re-analyzed with the new calibration. For the minority heating cases, self-consistent electric fields and a minority ion distribution function were simulated by iterating a full-wave code and a Fokker-Planck code. The simulated mode converted wave intensity was in quite reasonable agreement with the measurements close to the antenna ,yetdiscrepancies remain for comparison atmore » larger distances.« less

Authors:
ORCiD logo [1];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [3];  [4];  [5]
  1. Univ. of Tokyo (Japan)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  3. XCEL Engineering, Inc., Oak Ridge, TN (United States)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. CompX, Del Mar, CA (United States)
Publication Date:
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR). Scientific Discovery through Advanced Computing (SciDAC)
OSTI Identifier:
1547024
Alternate Identifier(s):
OSTI ID: 1229573
Grant/Contract Number:  
FG02-94ER54235; FC02-99-ER54512; FC02-01ER54648; FG02-94-ER54235
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 22; Journal Issue: 8; 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

Tsujii, N., Porkolab, M., Bonoli, P. T., Edlund, E. M., Ennever, P. C., Lin, Y., Wright, J. C., Wukitch, S. J., Jaeger, E. F., Green, D. L., and Harvey, R. W.. Validation of full-wave simulations for mode conversion of waves in the ion cyclotron range of frequencies with phase contrast imaging in Alcator C-Mod. United States: N. p., 2015. Web. doi:10.1063/1.4927912.
Tsujii, N., Porkolab, M., Bonoli, P. T., Edlund, E. M., Ennever, P. C., Lin, Y., Wright, J. C., Wukitch, S. J., Jaeger, E. F., Green, D. L., & Harvey, R. W.. Validation of full-wave simulations for mode conversion of waves in the ion cyclotron range of frequencies with phase contrast imaging in Alcator C-Mod. United States. https://doi.org/10.1063/1.4927912
Tsujii, N., Porkolab, M., Bonoli, P. T., Edlund, E. M., Ennever, P. C., Lin, Y., Wright, J. C., Wukitch, S. J., Jaeger, E. F., Green, D. L., and Harvey, R. W.. 2015. "Validation of full-wave simulations for mode conversion of waves in the ion cyclotron range of frequencies with phase contrast imaging in Alcator C-Mod". United States. https://doi.org/10.1063/1.4927912. https://www.osti.gov/servlets/purl/1547024.
@article{osti_1547024,
title = {Validation of full-wave simulations for mode conversion of waves in the ion cyclotron range of frequencies with phase contrast imaging in Alcator C-Mod},
author = {Tsujii, N. and Porkolab, M. and Bonoli, P. T. and Edlund, E. M. and Ennever, P. C. and Lin, Y. and Wright, J. C. and Wukitch, S. J. and Jaeger, E. F. and Green, D. L. and Harvey, R. W.},
abstractNote = {Mode conversion of fast waves in the ion cyclotron range of frequencies (ICRF) is known to result in current drive and flow drive under optimised conditions, which may be utilized to control plasma profiles and improve fusion plasma performance. To describe these processes accurately in a realistic toroidal geometry, numerical simulations are essential. Quantitative comparison of these simulations and the actual experimental measurements is important to validate their predictions and to evaluate their limitations. The phase contrast imaging (PCI) diagnostic has been used to directly detect the ICRF waves in the Alcator C-Mod tokamak. The calculations have been compared with full-wave simulations through a synthetic diagnostic technique. Recently, the frequency response of the PCI detector array on Alcator C-Mod was recalibrated, which greatly improved the comparison between the measurements and the simulations. Here, mode converted waves for D-3He and D-H plasmas with various ion species compositions were re-analyzed with the new calibration. For the minority heating cases, self-consistent electric fields and a minority ion distribution function were simulated by iterating a full-wave code and a Fokker-Planck code. The simulated mode converted wave intensity was in quite reasonable agreement with the measurements close to the antenna ,yetdiscrepancies remain for comparison at larger distances.},
doi = {10.1063/1.4927912},
url = {https://www.osti.gov/biblio/1547024}, journal = {Physics of Plasmas},
issn = {1070-664X},
number = 8,
volume = 22,
place = {United States},
year = {2015},
month = {8}
}

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Works referenced in this record:

Sawtooth period changes with mode conversion current drive on Alcator C-Mod
journal, January 2007


Investigation of performance limiting phenomena in a variable phase ICRF antenna in Alcator C-Mod
journal, July 2004


ICRF mode conversion flow drive on Alcator C-Mod
journal, April 2011


Development of steady-state operation using ion cyclotron heating in the Large Helical Device
journal, June 2014


First results from Alcator‐C‐MOD*
journal, May 1994


Observation of Mode-Converted Ion Bernstein Waves in the Microtor Tokamak
journal, July 1982


ICRF heating and profile control techniques in TFTR
journal, March 2000


Experimental Observations of Mode-Converted Ion Cyclotron Waves in a Tokamak Plasma by Phase Contrast Imaging
journal, April 2003


Numerical simulation of ion cyclotron waves in tokamak plasmas
journal, January 1999


Global-wave solutions with self-consistent velocity distributions in ion cyclotron heated plasmas
journal, June 2006


Mode Conversion Heating and Current Drive Experiments in TFTR
journal, January 1996


Observation of Second-Harmonic Ion Bernstein Waves Excited by Fast-Wave Mode Conversion in the Microtor Tokamak
journal, April 1984


Heating tokamaks via the ion-cyclotron and ion-ion hybrid resonances
journal, December 1977


Ion cyclotron range of frequency mode conversion flow drive in D( 3 He) plasmas on JET
journal, June 2012


Radio frequency heating in the ion‐cyclotron range of frequencies
journal, September 1985


Fast-wave heating of a two-component plasma
journal, October 1975


Ion-temperature measurement via laser scattering on ion Bernstein waves
journal, October 1982


Observation and modelling of ion cyclotron range of frequencies waves in the mode conversion region of Alcator C-Mod
journal, July 2005


Sheared Poloidal Flow Driven by Mode Conversion in Tokamak Plasmas
journal, May 2003


Plasma heating by fast magnetosonic waves in Tokamaks
conference, January 1994


Observation of Mode-Converted Ion Bernstein Wave by an HCN Laser Scattering
journal, October 1985


Simulation of high-power electromagnetic wave heating in the ITER burning plasma
journal, July 2008


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Validation metrics for turbulent plasma transport
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A combined phase contrast imaging and heterodyne interferometer system for multiscale fluctuation measurements (invited)
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