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

Title: Turbulent transport stabilization by ICRH minority fast ions in low rotating JET ILW L-mode plasmas

Abstract

The first experimental demonstration that fast ion induced stabilization of thermal turbulent transport takes place also at low values of plasma toroidal rotation has been obtained in JET ILW (ITER-like wall) L-mode plasmas with high (3He)-D ICRH (ion cyclotron resonance heating) power. A reduction of the gyro-Bohm normalized ion heat flux and higher values of the normalized ion temperature gradient have been observed at high ICRH power and low NBI (neutral beam injection) power and plasma rotation. Gyrokinetic simulations indicate that ITG (ion temperature gradient) turbulence stabilization induced by the presence of high-energetic 3He ions is the key mechanism in order to explain the experimental observations. Two main mechanisms have been identified to be responsible for the turbulence stabilization: a linear electrostatic wave-fast particle resonance mechanism and a nonlinear electromagnetic mechanism. The dependence of the stabilization on the 3He distribution function has also been studied.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [4];  [5];  [6];  [7];  [5];  [8];  [7]
  1. Univ. of Milano-Bicocca, Milano (Italy); CNR-Plasma Physics Inst., Milano (Italy)
  2. CNR-Plasma Physics Inst., Milano (Italy)
  3. Max Planck Inst. for Plasma Physics, Garching (Germany)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Culham Centre for Fusion Energy, Abingdon (United Kingdom)
  6. KTH Royal Inst. of Technology, Stockholm (Sweden)
  7. TEC Partner, Brussels (Belgium). LPP-ERM/KMS
  8. Culham Centre for Fusion Energy, Abingdon (United Kingdom); DIFFER-Dutch Inst. for Fundamental Energy Research, Eindhoven (Netherlands)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory-National Energy Research Scientific Computing Center
Sponsoring Org.:
USDOE Office of Science (SC)
Contributing Org.:
JET Contributors
OSTI Identifier:
1523634
DOE Contract Number:  
AC02–05CH11231
Resource Type:
Journal Article
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 58; Journal Issue: 5; Journal ID: ISSN 0029-5515
Country of Publication:
United States
Language:
English

Citation Formats

Bonanomi, N., Mantica, P., Di Siena, A., Delabie, E., Giroud, C., Johnson, T., Lerche, E., Menmuir, S., Tsalas, M., and Van Eester, D. Turbulent transport stabilization by ICRH minority fast ions in low rotating JET ILW L-mode plasmas. United States: N. p., 2018. Web. doi:10.1088/1741-4326/aab733.
Bonanomi, N., Mantica, P., Di Siena, A., Delabie, E., Giroud, C., Johnson, T., Lerche, E., Menmuir, S., Tsalas, M., & Van Eester, D. Turbulent transport stabilization by ICRH minority fast ions in low rotating JET ILW L-mode plasmas. United States. doi:10.1088/1741-4326/aab733.
Bonanomi, N., Mantica, P., Di Siena, A., Delabie, E., Giroud, C., Johnson, T., Lerche, E., Menmuir, S., Tsalas, M., and Van Eester, D. Wed . "Turbulent transport stabilization by ICRH minority fast ions in low rotating JET ILW L-mode plasmas". United States. doi:10.1088/1741-4326/aab733.
@article{osti_1523634,
title = {Turbulent transport stabilization by ICRH minority fast ions in low rotating JET ILW L-mode plasmas},
author = {Bonanomi, N. and Mantica, P. and Di Siena, A. and Delabie, E. and Giroud, C. and Johnson, T. and Lerche, E. and Menmuir, S. and Tsalas, M. and Van Eester, D.},
abstractNote = {The first experimental demonstration that fast ion induced stabilization of thermal turbulent transport takes place also at low values of plasma toroidal rotation has been obtained in JET ILW (ITER-like wall) L-mode plasmas with high (3He)-D ICRH (ion cyclotron resonance heating) power. A reduction of the gyro-Bohm normalized ion heat flux and higher values of the normalized ion temperature gradient have been observed at high ICRH power and low NBI (neutral beam injection) power and plasma rotation. Gyrokinetic simulations indicate that ITG (ion temperature gradient) turbulence stabilization induced by the presence of high-energetic 3He ions is the key mechanism in order to explain the experimental observations. Two main mechanisms have been identified to be responsible for the turbulence stabilization: a linear electrostatic wave-fast particle resonance mechanism and a nonlinear electromagnetic mechanism. The dependence of the stabilization on the 3He distribution function has also been studied.},
doi = {10.1088/1741-4326/aab733},
journal = {Nuclear Fusion},
issn = {0029-5515},
number = 5,
volume = 58,
place = {United States},
year = {2018},
month = {4}
}