Current convective instability in detached divertor plasma
Abstract
The asymmetry of inner and outer divertors, which cause the inner divertor to detach first, while the outer one is still attached, results in the large temperature difference between the vicinities of inner and outer targets and the onset of large electric potential drop through detached plasma of the inner divertor. A large potential drop along with the inhomogeneity of the resistivity of detached plasma across the divertor leg drives the current convective instability in the inner divertor and subsequent fluctuations of radiation loss similar to that observed in experiments. The estimates of the frequency of plasma parameter fluctuations due to the current convective instability are in a reasonable agreement with experimental data. Once the outer divertor also detaches, the temperature difference between the vicinities of inner and outer targets disappears, and the driving force for the current convective instability, and resulting oscillations of radiation loss, vanishes. This feature is indeed observed in experiments.
- Authors:
-
[2]
- Univ. of California, San Diego, CA (United States)
- Univ. of Saskatchewan, Saskatoon, SK (Canada)
- Publication Date:
- Research Org.:
- Univ. of California, San Diego, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1467898
- Alternate Identifier(s):
- OSTI ID: 1324487
- Grant/Contract Number:
- FG02-04ER54739
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 23; Journal Issue: 9; 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
Krasheninnikov, S. I., and Smolyakov, A. I. Current convective instability in detached divertor plasma. United States: N. p., 2016.
Web. doi:10.1063/1.4962568.
Krasheninnikov, S. I., & Smolyakov, A. I. Current convective instability in detached divertor plasma. United States. https://doi.org/10.1063/1.4962568
Krasheninnikov, S. I., and Smolyakov, A. I. Wed .
"Current convective instability in detached divertor plasma". United States. https://doi.org/10.1063/1.4962568. https://www.osti.gov/servlets/purl/1467898.
@article{osti_1467898,
title = {Current convective instability in detached divertor plasma},
author = {Krasheninnikov, S. I. and Smolyakov, A. I.},
abstractNote = {The asymmetry of inner and outer divertors, which cause the inner divertor to detach first, while the outer one is still attached, results in the large temperature difference between the vicinities of inner and outer targets and the onset of large electric potential drop through detached plasma of the inner divertor. A large potential drop along with the inhomogeneity of the resistivity of detached plasma across the divertor leg drives the current convective instability in the inner divertor and subsequent fluctuations of radiation loss similar to that observed in experiments. The estimates of the frequency of plasma parameter fluctuations due to the current convective instability are in a reasonable agreement with experimental data. Once the outer divertor also detaches, the temperature difference between the vicinities of inner and outer targets disappears, and the driving force for the current convective instability, and resulting oscillations of radiation loss, vanishes. This feature is indeed observed in experiments.},
doi = {10.1063/1.4962568},
journal = {Physics of Plasmas},
number = 9,
volume = 23,
place = {United States},
year = {Wed Sep 14 00:00:00 EDT 2016},
month = {Wed Sep 14 00:00:00 EDT 2016}
}
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Works referencing / citing this record:
Numerical study of the current-convective instability driven by asymmetry of detachment in inner and outer divertors
journal, January 2018
- Stepanenko, A. A.; Krasheninnikov, S. I.
- Physics of Plasmas, Vol. 25, Issue 1
Impact of divertor plasma parameters on characteristics of current-convective turbulence under DIII-D-like detached conditions
journal, December 2019
- Stepanenko, A. A.; Wang, H. Q.; Krasheninnikov, S. I.
- Physics of Plasmas, Vol. 26, Issue 12
Enhanced particle flux due to localized divertor MHD instability in DIII-D tokamak
journal, February 2020
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Controlling marginally detached divertor plasmas
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journal, June 2017
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Divertor impurity seeding experiments at the COMPASS tokamak
journal, September 2019
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