Dependence of the impurity transport on the dominant turbulent regime in ELM-y H-mode discharges on the DIII-D tokamak
Abstract
Laser blow-off injections of aluminum and tungsten have been performed on the DIII-D tokamak to investigate the variation of impurity transport in a set of dedicated ion and electron heating scans with a fixed value of the external torque. The particle transport is quantified via the Bayesian inference method, which, constrained by a combination of a charge exchange recombination spectroscopy, soft X-ray measurements, and VUV spectroscopy provides a detailed uncertainty quantification of transport coefficients. Contrasting discharge phases with a dominant electron and ion heating reveal 3-fold drop in the impurity confinement time and order of magnitude increase in midradius impurity diffusion, when additional electron heating is applied. Further, the calculated stationary aluminum density profiles reverse from peaked in electron heated to hollow in the ion heated case, following a similar trend as electron and carbon density. Comparable values of a core diffusion have been observed for W and Al ions, while differences in the propagation dynamics of these impurities are attributed to pedestal and edge transport. Modeling of the core transport with non-linear gyrokinetics code CGYRO, significantly underpredicts the magnitude of the variation in Al transport. Diffusion increases 3-times steeper with additional electron heat flux and 10-times lower diffusion ismore »
- Authors:
-
[1];
[1];
[2];
[3];
[4];
[2];
[1]
- Massachusetts Institute of Technology, Cambridge, MA (United States)
- General Atomics, San Diego, CA (United States)
- University of California–San Diego, La Jolla, CA (United States)
- University of Wisconsin-Madison, WI (United States)
- Publication Date:
- Research Org.:
- General Atomics, San Diego, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1650576
- Alternate Identifier(s):
- OSTI ID: 1644726
- Report Number(s):
- DOE-GA-54698
Journal ID: ISSN 1070-664X; TRN: US2202726
- Grant/Contract Number:
- FC02-04ER54698; AC02–05CH11231; FG02–91-ER54109; SC0014264; AC02-05CH11231; FG02-91-ER54109
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 27; Journal Issue: 8; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
Odstrčil, T., Howard, N. T., Sciortino, F., Chrystal, C., Holland, C., Hollmann, E., McKee, G., Thome, K. E., and Wilks, T. M. Dependence of the impurity transport on the dominant turbulent regime in ELM-y H-mode discharges on the DIII-D tokamak. United States: N. p., 2020.
Web. doi:10.1063/5.0010725.
Odstrčil, T., Howard, N. T., Sciortino, F., Chrystal, C., Holland, C., Hollmann, E., McKee, G., Thome, K. E., & Wilks, T. M. Dependence of the impurity transport on the dominant turbulent regime in ELM-y H-mode discharges on the DIII-D tokamak. United States. https://doi.org/10.1063/5.0010725
Odstrčil, T., Howard, N. T., Sciortino, F., Chrystal, C., Holland, C., Hollmann, E., McKee, G., Thome, K. E., and Wilks, T. M. Tue .
"Dependence of the impurity transport on the dominant turbulent regime in ELM-y H-mode discharges on the DIII-D tokamak". United States. https://doi.org/10.1063/5.0010725. https://www.osti.gov/servlets/purl/1650576.
@article{osti_1650576,
title = {Dependence of the impurity transport on the dominant turbulent regime in ELM-y H-mode discharges on the DIII-D tokamak},
author = {Odstrčil, T. and Howard, N. T. and Sciortino, F. and Chrystal, C. and Holland, C. and Hollmann, E. and McKee, G. and Thome, K. E. and Wilks, T. M.},
abstractNote = {Laser blow-off injections of aluminum and tungsten have been performed on the DIII-D tokamak to investigate the variation of impurity transport in a set of dedicated ion and electron heating scans with a fixed value of the external torque. The particle transport is quantified via the Bayesian inference method, which, constrained by a combination of a charge exchange recombination spectroscopy, soft X-ray measurements, and VUV spectroscopy provides a detailed uncertainty quantification of transport coefficients. Contrasting discharge phases with a dominant electron and ion heating reveal 3-fold drop in the impurity confinement time and order of magnitude increase in midradius impurity diffusion, when additional electron heating is applied. Further, the calculated stationary aluminum density profiles reverse from peaked in electron heated to hollow in the ion heated case, following a similar trend as electron and carbon density. Comparable values of a core diffusion have been observed for W and Al ions, while differences in the propagation dynamics of these impurities are attributed to pedestal and edge transport. Modeling of the core transport with non-linear gyrokinetics code CGYRO, significantly underpredicts the magnitude of the variation in Al transport. Diffusion increases 3-times steeper with additional electron heat flux and 10-times lower diffusion is observed in ion heated case than predicted by the modeling. Here, the CGYRO model quantitatively matches the increase of the Al diffusion when approaching the linear threshold for the transition from the ion temperature gradient (ITG) to trapped electron mode (TEM).},
doi = {10.1063/5.0010725},
journal = {Physics of Plasmas},
number = 8,
volume = 27,
place = {United States},
year = {Tue Aug 04 00:00:00 EDT 2020},
month = {Tue Aug 04 00:00:00 EDT 2020}
}
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