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Title: Effects of nitrogen seeding on core ion thermal transport in JET ILW L-mode plasmas

Abstract

A set of experiments was carried out in JET ILW (Joint European Torus with ITER-Like Wall) L-mode plasmas in order to study the effects of light impurities on core ion thermal transport. N was puffed into some discharges and its profile was measured by active Charge Exchange diagnostics, while ICRH power was deposited on- and off-axis in $$({\hspace{0pt}}^{3}{\rm He})-D$$ minority scheme in order to have a scan of local heat flux at constant total power with and without N injection. Experimentally, the ion temperature profiles are more peaked for similar heat fluxes when N is injected in the plasma. Gyro-kinetic simulations using the GENE code indicate that a stabilization of Ion Temperature Gradient driven turbulent transport due to main ion dilution and to changes in $$T_{e}/T_{i}$$ and s/q is responsible of the enhanced peaking. The quasi-linear models TGLF and QuaLiKiz are tested against the experimental and the gyro-kinetic results.

Authors:
ORCiD logo [1];  [2];  [3];  [4];  [5];  [2];  [4];  [6];  [7]
  1. Univ. of Milano-Bicocca, Milano (Italy); CNR-Inst. of Plasma Physics, Milano (Italy)
  2. CNR-Inst. of Plasma Physics, Milano (Italy)
  3. DIFFER--Dutch Inst. for Fundamental Energy Research, Eindhoven (Netherlands)
  4. Culham Centre for Fusion Energy, Abingdon (United Kingdom)
  5. TEC Partner, Brussels (Belgium). LPP-ERM/KMS
  6. DIFFER--Dutch Inst. for Fundamental Energy Research, Eindhoven (Netherlands); Culham Centre for Fusion Energy, Abingdon (United Kingdom)
  7. TEC Partner, Brussles (Belgium). LPP-ERM/KMS
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:
1523632
DOE Contract Number:  
AC02-05CH11231
Resource Type:
Journal Article
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 58; Journal Issue: 2; Journal ID: ISSN 0029-5515
Country of Publication:
United States
Language:
English

Citation Formats

Bonanomi, N., Mantica, P., Citrin, J., Giroud, C., Lerche, E., Sozzi, C., Taylor, D., Tsalas, M., and Van Eester, D. Effects of nitrogen seeding on core ion thermal transport in JET ILW L-mode plasmas. United States: N. p., 2018. Web. doi:10.1088/1741-4326/aa9e7c.
Bonanomi, N., Mantica, P., Citrin, J., Giroud, C., Lerche, E., Sozzi, C., Taylor, D., Tsalas, M., & Van Eester, D. Effects of nitrogen seeding on core ion thermal transport in JET ILW L-mode plasmas. United States. doi:10.1088/1741-4326/aa9e7c.
Bonanomi, N., Mantica, P., Citrin, J., Giroud, C., Lerche, E., Sozzi, C., Taylor, D., Tsalas, M., and Van Eester, D. Fri . "Effects of nitrogen seeding on core ion thermal transport in JET ILW L-mode plasmas". United States. doi:10.1088/1741-4326/aa9e7c.
@article{osti_1523632,
title = {Effects of nitrogen seeding on core ion thermal transport in JET ILW L-mode plasmas},
author = {Bonanomi, N. and Mantica, P. and Citrin, J. and Giroud, C. and Lerche, E. and Sozzi, C. and Taylor, D. and Tsalas, M. and Van Eester, D.},
abstractNote = {A set of experiments was carried out in JET ILW (Joint European Torus with ITER-Like Wall) L-mode plasmas in order to study the effects of light impurities on core ion thermal transport. N was puffed into some discharges and its profile was measured by active Charge Exchange diagnostics, while ICRH power was deposited on- and off-axis in $({\hspace{0pt}}^{3}{\rm He})-D$ minority scheme in order to have a scan of local heat flux at constant total power with and without N injection. Experimentally, the ion temperature profiles are more peaked for similar heat fluxes when N is injected in the plasma. Gyro-kinetic simulations using the GENE code indicate that a stabilization of Ion Temperature Gradient driven turbulent transport due to main ion dilution and to changes in $T_{e}/T_{i}$ and s/q is responsible of the enhanced peaking. The quasi-linear models TGLF and QuaLiKiz are tested against the experimental and the gyro-kinetic results.},
doi = {10.1088/1741-4326/aa9e7c},
journal = {Nuclear Fusion},
issn = {0029-5515},
number = 2,
volume = 58,
place = {United States},
year = {2018},
month = {1}
}