skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

This content will become publicly available on February 1, 2020

Title: On microinstabilities and turbulence in steep-gradient regions of fusion devices

Abstract

Higher excitation states along the background field of plasma instabilities dominate over standard, ground-state eigenmodes once the gradient drive becomes sufficiently strong. At this point, mode parity can no longer be used as the sole identifier of microtearing activity. Not only ion- and electron-temperature-gradient-driven modes occur in higher states, but even trapped electron modes, where decorrelation mechanisms enable odd-parity mode structures without a vanishing bounce average. Nonlinearly, higher-order Hermite states imprint their structures on the turbulence. Even at considerably strong drive, however, quasilinear models can recover nonlinear fluxes, as long as all subdominantly unstable eigenmodes are included. Due to flux contributions from such modes, gradient scalings of fluxes can be stronger than linear expectations.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [4];  [5];  [6];  [7]
  1. Univ. of Texas at Austin, Austin, TX (United States); Univ. of Wisconsin-Madison, Madison, WI (United States)
  2. Univ. of Texas at Austin, Austin, TX (United States)
  3. MIT Plasma Science and Fusion Center, Cambridge, MA (United States)
  4. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  5. Univ. of Wisconsin-Madison, Madison, WI (United States)
  6. FOM Institute DIFFER, Eindhoven (The Netherlands)
  7. Culham Science Centre, Oxon (United Kingdom)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE
Contributing Org.:
2013 Workshop on Impurity Transport, where the foundation for the present project was laid. Support was provided by the U.S. Department of Energy, Office of Science, Fusion Energy Sciences, under award Nos. DE-FG02-89ER53291 and DE-FG02-04ER-54742
OSTI Identifier:
1512483
Grant/Contract Number:  
AC02-09CH11466; FG02-04ER-54742; FG02-89ER53291
Resource Type:
Accepted Manuscript
Journal Name:
Plasma Physics and Controlled Fusion
Additional Journal Information:
Journal Volume: 61; Journal Issue: 3; Journal ID: ISSN 0741-3335
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; plasma instabilities; turbulence; fluctuations; transport

Citation Formats

Pueschel, M. J., Hatch, D. R., Ernst, D. R., Guttenfelder, W., Terry, P. W., Citrin, J., and Connor, J. W. On microinstabilities and turbulence in steep-gradient regions of fusion devices. United States: N. p., 2019. Web. doi:10.1088/1361-6587/aaf8c1.
Pueschel, M. J., Hatch, D. R., Ernst, D. R., Guttenfelder, W., Terry, P. W., Citrin, J., & Connor, J. W. On microinstabilities and turbulence in steep-gradient regions of fusion devices. United States. doi:10.1088/1361-6587/aaf8c1.
Pueschel, M. J., Hatch, D. R., Ernst, D. R., Guttenfelder, W., Terry, P. W., Citrin, J., and Connor, J. W. Fri . "On microinstabilities and turbulence in steep-gradient regions of fusion devices". United States. doi:10.1088/1361-6587/aaf8c1.
@article{osti_1512483,
title = {On microinstabilities and turbulence in steep-gradient regions of fusion devices},
author = {Pueschel, M. J. and Hatch, D. R. and Ernst, D. R. and Guttenfelder, W. and Terry, P. W. and Citrin, J. and Connor, J. W.},
abstractNote = {Higher excitation states along the background field of plasma instabilities dominate over standard, ground-state eigenmodes once the gradient drive becomes sufficiently strong. At this point, mode parity can no longer be used as the sole identifier of microtearing activity. Not only ion- and electron-temperature-gradient-driven modes occur in higher states, but even trapped electron modes, where decorrelation mechanisms enable odd-parity mode structures without a vanishing bounce average. Nonlinearly, higher-order Hermite states imprint their structures on the turbulence. Even at considerably strong drive, however, quasilinear models can recover nonlinear fluxes, as long as all subdominantly unstable eigenmodes are included. Due to flux contributions from such modes, gradient scalings of fluxes can be stronger than linear expectations.},
doi = {10.1088/1361-6587/aaf8c1},
journal = {Plasma Physics and Controlled Fusion},
number = 3,
volume = 61,
place = {United States},
year = {2019},
month = {2}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on February 1, 2020
Publisher's Version of Record

Save / Share: