Impurity-induced divertor plasma oscillations
Abstract
Two different oscillatory plasma regimes induced by seeding the plasma with high- and low-Z impurities are found for ITER-like divertor plasmas, using computer modeling with the DUSTT/UEDGE and SOLPS4.3 plasma-impurity transport codes. Furthermore, the oscillations are characterized by significant variations of the impurity-radiated power and of the peak heat load on the divertor targets. In the qualitative analysis of the divertor plasma oscillations it reveals different mechanisms driving the oscillations in the cases of high- and low-Z impurity seeding. The oscillations caused by the high-Z impurities are excited near the X-point by an impurity-related instability of the radiation-condensation type, accompanied by parallel impurity ion transport affected by the thermal and plasma friction forces. The driving mechanism of the oscillations induced by the low-Z impurities is related to the cross-field transport of the impurity atoms, causing alteration between the high and low plasma temperature regimes in the plasma recycling region near the divertor targets. We also discuss the implications of the impurity-induced plasma oscillations for divertor operation in the next generation tokamaks.
- Authors:
-
[1];
[2];
- Univ. of California, San Diego, La Jolla, CA (United States)
- NRC "Kurchatov Institute", Moscow (Russia); National Research Nuclear Univ. MEPhI, Moscow (Russia)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Publication Date:
- Research Org.:
- Univ. of California, San Diego, La Jolla, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1234254
- Alternate Identifier(s):
- OSTI ID: 1234151; OSTI ID: 1343030
- Report Number(s):
- LLNL-JRNL-678528
Journal ID: ISSN 1070-664X; PHPAEN; FG02-04ER54739, AC52-07NA27344
- Grant/Contract Number:
- FG02-06ER54852; AC52-07NA27344; FG02-04ER54739
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 23; Journal Issue: 1; 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; oscillations; plasma; impurity; radiation; divertors; plasma impuritites; plasma oscillations; plasma temperature; friction; 70 PLASMA PHYSICS AND FUSION
Citation Formats
Smirnov, R. D., Kukushkin, A. S., Krasheninnikov, S. I., Pigarov, A. Yu., and Rognlien, T. D. Impurity-induced divertor plasma oscillations. United States: N. p., 2016.
Web. doi:10.1063/1.4939539.
Smirnov, R. D., Kukushkin, A. S., Krasheninnikov, S. I., Pigarov, A. Yu., & Rognlien, T. D. Impurity-induced divertor plasma oscillations. United States. https://doi.org/10.1063/1.4939539
Smirnov, R. D., Kukushkin, A. S., Krasheninnikov, S. I., Pigarov, A. Yu., and Rognlien, T. D. Thu .
"Impurity-induced divertor plasma oscillations". United States. https://doi.org/10.1063/1.4939539. https://www.osti.gov/servlets/purl/1234254.
@article{osti_1234254,
title = {Impurity-induced divertor plasma oscillations},
author = {Smirnov, R. D. and Kukushkin, A. S. and Krasheninnikov, S. I. and Pigarov, A. Yu. and Rognlien, T. D.},
abstractNote = {Two different oscillatory plasma regimes induced by seeding the plasma with high- and low-Z impurities are found for ITER-like divertor plasmas, using computer modeling with the DUSTT/UEDGE and SOLPS4.3 plasma-impurity transport codes. Furthermore, the oscillations are characterized by significant variations of the impurity-radiated power and of the peak heat load on the divertor targets. In the qualitative analysis of the divertor plasma oscillations it reveals different mechanisms driving the oscillations in the cases of high- and low-Z impurity seeding. The oscillations caused by the high-Z impurities are excited near the X-point by an impurity-related instability of the radiation-condensation type, accompanied by parallel impurity ion transport affected by the thermal and plasma friction forces. The driving mechanism of the oscillations induced by the low-Z impurities is related to the cross-field transport of the impurity atoms, causing alteration between the high and low plasma temperature regimes in the plasma recycling region near the divertor targets. We also discuss the implications of the impurity-induced plasma oscillations for divertor operation in the next generation tokamaks.},
doi = {10.1063/1.4939539},
journal = {Physics of Plasmas},
number = 1,
volume = 23,
place = {United States},
year = {Thu Jan 07 00:00:00 EST 2016},
month = {Thu Jan 07 00:00:00 EST 2016}
}
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Works referencing / citing this record:
Characterization of oscillations observed in reduced physics SOLPS simulations
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Impact of divertor plasma parameters on characteristics of current-convective turbulence under DIII-D-like detached conditions
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