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Title: Full-wave simulations of ICRF heating regimes in toroidal plasmas with non-Maxwellian distribution functions

Abstract

At the power levels required for significant heating and current drive in magnetically-confined toroidal plasma, modification of the particle distribution function from a Maxwellian shape is likely [T. H. Stix, Nucl. Fusion, 15 737 (1975)], with consequent changes in wave propagation and in the location and amount of absorption. In order to study these effects computationally, both the finite-Larmor-radius and the high-harmonic fast wave (HHFW), versions of the full-wave, hot-plasma toroidal simulation code TORIC [M. Brambilla, Plasma Phys. Control. Fusion 41, 1 (1999) and M. Brambilla, Plasma Phys. Control. Fusion 44, 2423 (2002)], have been extended to allow the prescription of arbitrary velocity distributions of the form f(v||, v_perp, psi , theta). For hydrogen (H) minority heating of a deuterium (D) plasma with anisotropic Maxwellian H distributions, the fractional H absorption varies significantly with changes in parallel temperature but is essentially independent of perpendicular temperature. On the other hand, for HHFW regime with anisotropic Maxwellian fast ion distribution, the fractional beam ion absorption varies mainly with changes in the perpendicular temperature. The evaluation of the wave-field and power absorption, through the full wave solver, with the ion distribution function provided by either aMonte-Carlo particle and Fokker-Planck codes is also examinedmore » for Alcator C-Mod and NSTX plasmas. Non-Maxwellian effects generally tends to increase the absorption with respect to the equivalent Maxwellian distribution.« less

Authors:
; ; ; ; ; ORCiD logo ; ; ;
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
  4. XCEL Engineering Inc., 1066 Commerce Park Drive, Oak Ridge, TN 37830, United States of America
Publication Date:
DOE Contract Number:  
AC02-CH0911466; FC02-01ER54648
Product Type:
Dataset
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Keywords:
NSTX-U
OSTI Identifier:
1356364
DOI:
10.11578/1356364

Citation Formats

Bertelli, N., Valeo, E.J., Green, D.L., Gorelenkova, M., Phillips, C.K., Podesta, M., Lee, J.P., Wright, J.C., and Jaeger, E.F. Full-wave simulations of ICRF heating regimes in toroidal plasmas with non-Maxwellian distribution functions. United States: N. p., 2017. Web. doi:10.11578/1356364.
Bertelli, N., Valeo, E.J., Green, D.L., Gorelenkova, M., Phillips, C.K., Podesta, M., Lee, J.P., Wright, J.C., & Jaeger, E.F. Full-wave simulations of ICRF heating regimes in toroidal plasmas with non-Maxwellian distribution functions. United States. doi:10.11578/1356364.
Bertelli, N., Valeo, E.J., Green, D.L., Gorelenkova, M., Phillips, C.K., Podesta, M., Lee, J.P., Wright, J.C., and Jaeger, E.F. 2017. "Full-wave simulations of ICRF heating regimes in toroidal plasmas with non-Maxwellian distribution functions". United States. doi:10.11578/1356364. https://www.osti.gov/servlets/purl/1356364. Pub date:Mon May 01 00:00:00 EDT 2017
@article{osti_1356364,
title = {Full-wave simulations of ICRF heating regimes in toroidal plasmas with non-Maxwellian distribution functions},
author = {Bertelli, N. and Valeo, E.J. and Green, D.L. and Gorelenkova, M. and Phillips, C.K. and Podesta, M. and Lee, J.P. and Wright, J.C. and Jaeger, E.F.},
abstractNote = {At the power levels required for significant heating and current drive in magnetically-confined toroidal plasma, modification of the particle distribution function from a Maxwellian shape is likely [T. H. Stix, Nucl. Fusion, 15 737 (1975)], with consequent changes in wave propagation and in the location and amount of absorption. In order to study these effects computationally, both the finite-Larmor-radius and the high-harmonic fast wave (HHFW), versions of the full-wave, hot-plasma toroidal simulation code TORIC [M. Brambilla, Plasma Phys. Control. Fusion 41, 1 (1999) and M. Brambilla, Plasma Phys. Control. Fusion 44, 2423 (2002)], have been extended to allow the prescription of arbitrary velocity distributions of the form f(v||, v_perp, psi , theta). For hydrogen (H) minority heating of a deuterium (D) plasma with anisotropic Maxwellian H distributions, the fractional H absorption varies significantly with changes in parallel temperature but is essentially independent of perpendicular temperature. On the other hand, for HHFW regime with anisotropic Maxwellian fast ion distribution, the fractional beam ion absorption varies mainly with changes in the perpendicular temperature. The evaluation of the wave-field and power absorption, through the full wave solver, with the ion distribution function provided by either aMonte-Carlo particle and Fokker-Planck codes is also examined for Alcator C-Mod and NSTX plasmas. Non-Maxwellian effects generally tends to increase the absorption with respect to the equivalent Maxwellian distribution.},
doi = {10.11578/1356364},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2017},
month = {5}
}

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Works referencing / citing this record:

Full-wave simulations of ICRF heating regimes in toroidal plasma with non-Maxwellian distribution functions
journal, April 2017

  • Bertelli, N.; Valeo, E. J.; Green, D. L.
  • Nuclear Fusion, Vol. 57, Issue 5, Article No. 056035
  • DOI: 10.1088/1741-4326/aa66db

Full-wave simulations of ICRF heating regimes in toroidal plasma with non-Maxwellian distribution functions
journal, April 2017

  • Bertelli, N.; Valeo, E. J.; Green, D. L.
  • Nuclear Fusion, Vol. 57, Issue 5, Article No. 056035
  • DOI: 10.1088/1741-4326/aa66db