Transition from ITG to MTM linear instabilities near pedestals of high density plasmas
Abstract
Investigation of linear gyrokinetic ion-scale modes ([Formula: see text]) finds that a transition from ion temperature gradient to microtearing mode (MTM) dominance occurs as the density is increased near the pedestal region of a parameterized DIII-D sized tokamak. H-modes profile densities, temperatures, and equilibria are parameterized utilizing the OMFIT PRO_create module. With these profiles, linear gyrokinetic ion-scale instabilities are predicted with CGYRO. This transition ( nMTM) has a weak dependence on radial location in the region near the top of the pedestal ([Formula: see text]), which allows simulating single radii to examine the approximate scaling of nMTM with global parameters. The critical nMTM is found to scale with plasma current. Additionally, increasing the minor radius by decreasing the aspect ratio and increasing the major radius are found to reduce nMTM. However, any relationship between nMTM and density limit physics remains unclear as nMTM increases relative to the Greenwald density with larger minor radius and with larger magnetic field, suggesting that the transport due to MTM may be less important for a reactor. Additionally, nMTM is sensitive to the pedestal temperature, the local electron and ion gradients, the ratio of ion to electron temperature [Formula: see text], and the current profile.more »
- Authors:
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[1];
[1];
[1];
[1];
[1];
[1];
[1];
[2];
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[3]
- General Atomics, San Diego, CA (United States)
- Oak Ridge Associated Universities (ORAU), Oak Ridge, TN (United States)
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (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), Fusion Energy Sciences (FES); USDOE Office of Science (SC) Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1974430
- Alternate Identifier(s):
- OSTI ID: 1969777; OSTI ID: 1989687; OSTI ID: 1991491
- Grant/Contract Number:
- FG02-95ER54309; FC02-04ER54698; SC0021113; AC02-09CH11466
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 30; Journal Issue: 4; 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; NSTX, ST, MTM
Citation Formats
McClenaghan, Joseph, Slendebroek, Tim, Staebler, Gary M., Smith, Sterling P., Meneghini, Orso M., Grierson, Brian A., Thome, Kathreen E., Avdeeva, Galina, Lao, Lang L., Candy, Jeff, and Guttenfelder, Walter. Transition from ITG to MTM linear instabilities near pedestals of high density plasmas. United States: N. p., 2023.
Web. doi:10.1063/5.0141179.
McClenaghan, Joseph, Slendebroek, Tim, Staebler, Gary M., Smith, Sterling P., Meneghini, Orso M., Grierson, Brian A., Thome, Kathreen E., Avdeeva, Galina, Lao, Lang L., Candy, Jeff, & Guttenfelder, Walter. Transition from ITG to MTM linear instabilities near pedestals of high density plasmas. United States. https://doi.org/10.1063/5.0141179
McClenaghan, Joseph, Slendebroek, Tim, Staebler, Gary M., Smith, Sterling P., Meneghini, Orso M., Grierson, Brian A., Thome, Kathreen E., Avdeeva, Galina, Lao, Lang L., Candy, Jeff, and Guttenfelder, Walter. Thu .
"Transition from ITG to MTM linear instabilities near pedestals of high density plasmas". United States. https://doi.org/10.1063/5.0141179. https://www.osti.gov/servlets/purl/1974430.
@article{osti_1974430,
title = {Transition from ITG to MTM linear instabilities near pedestals of high density plasmas},
author = {McClenaghan, Joseph and Slendebroek, Tim and Staebler, Gary M. and Smith, Sterling P. and Meneghini, Orso M. and Grierson, Brian A. and Thome, Kathreen E. and Avdeeva, Galina and Lao, Lang L. and Candy, Jeff and Guttenfelder, Walter},
abstractNote = {Investigation of linear gyrokinetic ion-scale modes ([Formula: see text]) finds that a transition from ion temperature gradient to microtearing mode (MTM) dominance occurs as the density is increased near the pedestal region of a parameterized DIII-D sized tokamak. H-modes profile densities, temperatures, and equilibria are parameterized utilizing the OMFIT PRO_create module. With these profiles, linear gyrokinetic ion-scale instabilities are predicted with CGYRO. This transition ( nMTM) has a weak dependence on radial location in the region near the top of the pedestal ([Formula: see text]), which allows simulating single radii to examine the approximate scaling of nMTM with global parameters. The critical nMTM is found to scale with plasma current. Additionally, increasing the minor radius by decreasing the aspect ratio and increasing the major radius are found to reduce nMTM. However, any relationship between nMTM and density limit physics remains unclear as nMTM increases relative to the Greenwald density with larger minor radius and with larger magnetic field, suggesting that the transport due to MTM may be less important for a reactor. Additionally, nMTM is sensitive to the pedestal temperature, the local electron and ion gradients, the ratio of ion to electron temperature [Formula: see text], and the current profile. MTMs are predicted to be the dominant instability in the core at similar Greenwald fractions for DIII-D, NSTX, and NSTX-U H-mode experiments, supporting the results of the parameterized study. Additionally, MTMs continue to be the dominant linear instability in a DIII-D L-mode after an H–L transition as the plasma approaches a density limit disruption despite the large change in plasma profiles.},
doi = {10.1063/5.0141179},
journal = {Physics of Plasmas},
number = 4,
volume = 30,
place = {United States},
year = {Thu Apr 13 00:00:00 EDT 2023},
month = {Thu Apr 13 00:00:00 EDT 2023}
}
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