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:
-
[1];
[2];
[3];
[4];
- Univ. di Milano (Italy); CNR, Milano (Italy)
- CNR, Milano (Italy)
- Max Planck Society, Garching (Germany)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Culham Centre for Fusion Energy, Abingdon (United Kingdom)
- KTH Royal Inst. of Technology, Stockholm (Sweden)
- LPP-ERM/KMS, Brussels (Belgium)
- Culham Centre for Fusion Energy, Abingdon (United Kingdom); Dutch Inst. for Fundamental Energy Research (DIFFER), Eindhoven (Netherlands)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); European Commission (EC)
- Contributing Org.:
- JET Contributors
- OSTI Identifier:
- 1811410
- Grant/Contract Number:
- AC05-00OR22725; 633053
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 58; Journal Issue: 5; Journal ID: ISSN 0029-5515
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
Bonanomi, N., Mantica, P., Di Siena, A., Delabie, Ephrem G., 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, Ephrem G., 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. https://doi.org/10.1088/1741-4326/aab733
Bonanomi, N., Mantica, P., Di Siena, A., Delabie, Ephrem G., 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. https://doi.org/10.1088/1741-4326/aab733. https://www.osti.gov/servlets/purl/1811410.
@article{osti_1811410,
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, Ephrem G. 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},
number = 5,
volume = 58,
place = {United States},
year = {Wed Apr 04 00:00:00 EDT 2018},
month = {Wed Apr 04 00:00:00 EDT 2018}
}
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