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Title: 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:
 [1]; ORCiD logo [2]
  1. Univ. of California, San Diego, CA (United States)
  2. 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) (SC-24)
OSTI Identifier:
1467898
Alternate Identifier(s):
OSTI ID: 1324487
Grant/Contract Number:  
FG02-04ER54739
Resource Type:
Journal Article: 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. doi:10.1063/1.4962568.
Krasheninnikov, S. I., and Smolyakov, A. I.. Wed . "Current convective instability in detached divertor plasma". United States. doi: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}
}

Journal Article:
Free Publicly Available Full Text
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