Role of fast ion pressure in the isotope effect in JET L-mode plasmas
Abstract
This paper presents results of JET ITER-like wall L-mode experiments in hydrogen and deuterium (D) plasmas, dedicated to the study of the isotope dependence of ion heat transport by determination of the ion critical gradient and stiffness by varying the ion cyclotron resonance heating power deposition. When no strong role of fast ions in the plasma core is expected, the main difference between the two isotope plasmas is determined by the plasma edge and the core behavior is consistent with a gyro-Bohm scaling. When the heating power (and the fast ion pressure) is increased, in addition to the difference in the edge region, also the plasma core shows substantial changes. The stabilization of ion heat transport by fast ions, clearly visible in D plasmas, appears to be weaker in H plasmas, resulting in a higher ion heat flux in H with apparent anti-gyro-Bohm mass scaling. The difference is found to be caused by the different fast ion pressure between H and D plasmas, related to the heating power settings and to the different fast ion slowing down time, and is completely accounted for in non-linear gyrokinetic simulations. The application of the TGLF quasi-linear model to this set of data ismore »
- Authors:
-
[1];
[5];
[6];
- Max Planck Institute for Plasma Physics, Garching (Germany)
- University of Milano-Bicocca (Italy); National Research Council (CNR), Milano (Italy)
- National Research Council (CNR), Milano (Italy)
- Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Barcelona Supercomputing Center (Spain)
- The Laboratory for Plasma Physics of the Ecole Royale Militaire / Koninklijke Militaire School (LPP-ERM / KMS) (Belgium)
- General Atomics, San Diego, CA (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1811414
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 59; Journal Issue: 9; 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., Casiraghi, I., Mantica, P., Challis, C., Delabie, E., Fable, E., Gallart, D., Giroud, C., Lerche, E., Lomas, P., Menmuir, S., Staebler, G. M., Taylor, D., and Van Eester, D. Role of fast ion pressure in the isotope effect in JET L-mode plasmas. United States: N. p., 2019.
Web. doi:10.1088/1741-4326/ab2d4f.
Bonanomi, N., Casiraghi, I., Mantica, P., Challis, C., Delabie, E., Fable, E., Gallart, D., Giroud, C., Lerche, E., Lomas, P., Menmuir, S., Staebler, G. M., Taylor, D., & Van Eester, D. Role of fast ion pressure in the isotope effect in JET L-mode plasmas. United States. https://doi.org/10.1088/1741-4326/ab2d4f
Bonanomi, N., Casiraghi, I., Mantica, P., Challis, C., Delabie, E., Fable, E., Gallart, D., Giroud, C., Lerche, E., Lomas, P., Menmuir, S., Staebler, G. M., Taylor, D., and Van Eester, D. Tue .
"Role of fast ion pressure in the isotope effect in JET L-mode plasmas". United States. https://doi.org/10.1088/1741-4326/ab2d4f. https://www.osti.gov/servlets/purl/1811414.
@article{osti_1811414,
title = {Role of fast ion pressure in the isotope effect in JET L-mode plasmas},
author = {Bonanomi, N. and Casiraghi, I. and Mantica, P. and Challis, C. and Delabie, E. and Fable, E. and Gallart, D. and Giroud, C. and Lerche, E. and Lomas, P. and Menmuir, S. and Staebler, G. M. and Taylor, D. and Van Eester, D.},
abstractNote = {This paper presents results of JET ITER-like wall L-mode experiments in hydrogen and deuterium (D) plasmas, dedicated to the study of the isotope dependence of ion heat transport by determination of the ion critical gradient and stiffness by varying the ion cyclotron resonance heating power deposition. When no strong role of fast ions in the plasma core is expected, the main difference between the two isotope plasmas is determined by the plasma edge and the core behavior is consistent with a gyro-Bohm scaling. When the heating power (and the fast ion pressure) is increased, in addition to the difference in the edge region, also the plasma core shows substantial changes. The stabilization of ion heat transport by fast ions, clearly visible in D plasmas, appears to be weaker in H plasmas, resulting in a higher ion heat flux in H with apparent anti-gyro-Bohm mass scaling. The difference is found to be caused by the different fast ion pressure between H and D plasmas, related to the heating power settings and to the different fast ion slowing down time, and is completely accounted for in non-linear gyrokinetic simulations. The application of the TGLF quasi-linear model to this set of data is also discussed.},
doi = {10.1088/1741-4326/ab2d4f},
journal = {Nuclear Fusion},
number = 9,
volume = 59,
place = {United States},
year = {Tue Jul 30 00:00:00 EDT 2019},
month = {Tue Jul 30 00:00:00 EDT 2019}
}
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