Ion thermal transport in the H-mode edge transport barrier on DIII-D
Abstract
The power balance ion heat flux in the pedestal region on DIII-D increases and becomes increasingly anomalous (above conventional neoclassical) in experiments with higher temperature and lower density pedestals where the ion collisionality ($$v^*_i$$) is lowered toward values expected on ITER. Direct measurements of the main-ion temperature are shown to be essential on DIII-D when calculating the ion heat flux due to differences between the temperature of $D^+$ and the more commonly measured $$C^{6+}$$ impurity ions approaching the separatrix. Neoclassical transport calculations from NEO and non-linear gyrokinetic calculations using CGYRO are consistent with these observations and show that while neoclassical transport plays an important role, the turbulent ion heat flux due to ion scale electrostatic turbulence is significant and can contribute similar or larger ion heat fluxes at lower collisionality. Beam emission spectroscopy and Doppler backscattering measurements in the steep gradient region of the H-mode pedestal reveal increased broadband, long-wavelength ion scale fluctuations for the low $$v^*_i$$ discharges at the radius where the non-linear CGYRO simulations were run. Taken together, increased fluctuations, power balance calculations, and gyrokinetic simulations show that the above neoclassical ion heat fluxes, including the increases at lower $$v^*_i$$, are likely due to weakly suppressed ion scale electrostatic turbulence. These new results are based on world first inferred ion and electron heat fluxes in the pedestal region of deuterium plasmas using direct measurements of the deuterium temperature for power balance across ion collisionalities covering an order of magnitude from high $$v^*_i$$ values of 1.3 down to ITER relevant $$v^*_i$$ ~0.1.
- Authors:
-
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- University of California, Los Angeles, CA (United States)
- General Atomics, San Diego, CA (United States)
- University of Wisconsin, Madison, WI (United States)
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States); General Atomics, San Diego, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1856194
- Alternate Identifier(s):
- OSTI ID: 1841036; OSTI ID: 1884313
- Report Number(s):
- A29615
Journal ID: ISSN 1070-664X; TRN: US2305107
- Grant/Contract Number:
- FC02-04ER54698; AC02-09CH11466; SC0019352; FG02-08ER54999; FG02-95ER54309; SC0019302
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 29; Journal Issue: 1; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; plasma confinement; emission spectroscopy; tokamaks; plasma instabilities; cryokinetic simulations; thermal transport
Citation Formats
Haskey, S. R., Ashourvan, Arash, Banerjee, S., Barada, K., Belli, E. A., Bortolon, A., Candy, J., Chen, J., Chrystal, C., Grierson, B. A., Groebner, R. J., Laggner, F. M., Knolker, M., Kramer, G. J., Major, M. R., Mckee, G., Staebler, G. M., Yan, Z., and Van Zeeland, M. A. Ion thermal transport in the H-mode edge transport barrier on DIII-D. United States: N. p., 2022.
Web. doi:10.1063/5.0072155.
Haskey, S. R., Ashourvan, Arash, Banerjee, S., Barada, K., Belli, E. A., Bortolon, A., Candy, J., Chen, J., Chrystal, C., Grierson, B. A., Groebner, R. J., Laggner, F. M., Knolker, M., Kramer, G. J., Major, M. R., Mckee, G., Staebler, G. M., Yan, Z., & Van Zeeland, M. A. Ion thermal transport in the H-mode edge transport barrier on DIII-D. United States. https://doi.org/10.1063/5.0072155
Haskey, S. R., Ashourvan, Arash, Banerjee, S., Barada, K., Belli, E. A., Bortolon, A., Candy, J., Chen, J., Chrystal, C., Grierson, B. A., Groebner, R. J., Laggner, F. M., Knolker, M., Kramer, G. J., Major, M. R., Mckee, G., Staebler, G. M., Yan, Z., and Van Zeeland, M. A. Wed .
"Ion thermal transport in the H-mode edge transport barrier on DIII-D". United States. https://doi.org/10.1063/5.0072155. https://www.osti.gov/servlets/purl/1856194.
@article{osti_1856194,
title = {Ion thermal transport in the H-mode edge transport barrier on DIII-D},
author = {Haskey, S. R. and Ashourvan, Arash and Banerjee, S. and Barada, K. and Belli, E. A. and Bortolon, A. and Candy, J. and Chen, J. and Chrystal, C. and Grierson, B. A. and Groebner, R. J. and Laggner, F. M. and Knolker, M. and Kramer, G. J. and Major, M. R. and Mckee, G. and Staebler, G. M. and Yan, Z. and Van Zeeland, M. A.},
abstractNote = {The power balance ion heat flux in the pedestal region on DIII-D increases and becomes increasingly anomalous (above conventional neoclassical) in experiments with higher temperature and lower density pedestals where the ion collisionality ($v^*_i$) is lowered toward values expected on ITER. Direct measurements of the main-ion temperature are shown to be essential on DIII-D when calculating the ion heat flux due to differences between the temperature of $D^+$ and the more commonly measured $C^{6+}$ impurity ions approaching the separatrix. Neoclassical transport calculations from NEO and non-linear gyrokinetic calculations using CGYRO are consistent with these observations and show that while neoclassical transport plays an important role, the turbulent ion heat flux due to ion scale electrostatic turbulence is significant and can contribute similar or larger ion heat fluxes at lower collisionality. Beam emission spectroscopy and Doppler backscattering measurements in the steep gradient region of the H-mode pedestal reveal increased broadband, long-wavelength ion scale fluctuations for the low $v^*_i$ discharges at the radius where the non-linear CGYRO simulations were run. Taken together, increased fluctuations, power balance calculations, and gyrokinetic simulations show that the above neoclassical ion heat fluxes, including the increases at lower $v^*_i$, are likely due to weakly suppressed ion scale electrostatic turbulence. These new results are based on world first inferred ion and electron heat fluxes in the pedestal region of deuterium plasmas using direct measurements of the deuterium temperature for power balance across ion collisionalities covering an order of magnitude from high $v^*_i$ values of 1.3 down to ITER relevant $v^*_i$ ~0.1.},
doi = {10.1063/5.0072155},
journal = {Physics of Plasmas},
number = 1,
volume = 29,
place = {United States},
year = {Wed Jan 19 00:00:00 EST 2022},
month = {Wed Jan 19 00:00:00 EST 2022}
}
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