The causes of the disruptive tearing instabilities of the ITER Baseline Scenario in DIII-D
Abstract
Analysis of the evolving current density (J), pedestal and rotation profiles in a database of 200 ITER Baseline Scenario (IBS) demonstration discharges in the DIII-D tokamak identifies the current profile as a key determinant of the disruptive instability limiting both high and low torque operation of these q95=3 plasmas. The m=2/n=1 tearing modes, occurring after several pressure-relaxation times, are linked to the shape of the current profile in the outer region of the plasma. The q=2 surface is located at r~0.78, near a minimum in J. A steeper "well" around the q=2 surface is correlated with the instabilities, and this finding is consistent for modes that occur both early (<1 TR) and late (>2 TR) on the βN flattop, at high and low input torque, for discharges with and without direct electron heating. Low rotation or differential rotation in the core plasmas is shown to not be the direct cause of the onset of these instabilities. The current profile trends identified in this work indicate that the modes limiting the Q=10 operation in the ITER demonstration plasmas are likely due to the slow evolution of the current profile, and reveal which shape of the current profile is more prone tomore »
- Authors:
-
- Columbia Univ., New York, NY (United States)
- General Atomics, San Diego, CA (United States)
- Publication Date:
- Research Org.:
- General Atomics, San Diego, CA (United States)
- Sponsoring Org.:
- USDOE Office of Nuclear Energy (NE)
- OSTI Identifier:
- 1470983
- Grant/Contract Number:
- FC02-04ER54698; FG02-04ER54761
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 58; Journal Issue: 10; Journal ID: ISSN 0029-5515
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ITER Baseline; stability; database; MHD stability; tearing stability; scenarios
Citation Formats
Turco, F., Luce, T. C., Solomon, W., Jackson, G., Navratil, G. A., and Hanson, J. M. The causes of the disruptive tearing instabilities of the ITER Baseline Scenario in DIII-D. United States: N. p., 2018.
Web. doi:10.1088/1741-4326/aadbb5.
Turco, F., Luce, T. C., Solomon, W., Jackson, G., Navratil, G. A., & Hanson, J. M. The causes of the disruptive tearing instabilities of the ITER Baseline Scenario in DIII-D. United States. https://doi.org/10.1088/1741-4326/aadbb5
Turco, F., Luce, T. C., Solomon, W., Jackson, G., Navratil, G. A., and Hanson, J. M. Tue .
"The causes of the disruptive tearing instabilities of the ITER Baseline Scenario in DIII-D". United States. https://doi.org/10.1088/1741-4326/aadbb5. https://www.osti.gov/servlets/purl/1470983.
@article{osti_1470983,
title = {The causes of the disruptive tearing instabilities of the ITER Baseline Scenario in DIII-D},
author = {Turco, F. and Luce, T. C. and Solomon, W. and Jackson, G. and Navratil, G. A. and Hanson, J. M.},
abstractNote = {Analysis of the evolving current density (J), pedestal and rotation profiles in a database of 200 ITER Baseline Scenario (IBS) demonstration discharges in the DIII-D tokamak identifies the current profile as a key determinant of the disruptive instability limiting both high and low torque operation of these q95=3 plasmas. The m=2/n=1 tearing modes, occurring after several pressure-relaxation times, are linked to the shape of the current profile in the outer region of the plasma. The q=2 surface is located at r~0.78, near a minimum in J. A steeper "well" around the q=2 surface is correlated with the instabilities, and this finding is consistent for modes that occur both early (<1 TR) and late (>2 TR) on the βN flattop, at high and low input torque, for discharges with and without direct electron heating. Low rotation or differential rotation in the core plasmas is shown to not be the direct cause of the onset of these instabilities. The current profile trends identified in this work indicate that the modes limiting the Q=10 operation in the ITER demonstration plasmas are likely due to the slow evolution of the current profile, and reveal which shape of the current profile is more prone to the 2/1 tearing instability.},
doi = {10.1088/1741-4326/aadbb5},
journal = {Nuclear Fusion},
number = 10,
volume = 58,
place = {United States},
year = {Tue Sep 11 00:00:00 EDT 2018},
month = {Tue Sep 11 00:00:00 EDT 2018}
}
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Works referencing / citing this record:
DIII-D research towards establishing the scientific basis for future fusion reactors
journal, June 2019
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- Nuclear Fusion, Vol. 59, Issue 11
Progress in disruption prevention for ITER
journal, June 2019
- Strait, E. J.; Barr, J. L.; Baruzzo, M.
- Nuclear Fusion, Vol. 59, Issue 11
On the triggerless onset of 2/1 neoclassical tearing modes in TCV
journal, December 2019
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