Impurity-induced divertor plasma oscillations

Smirnov, R. D.; Kukushkin, A. S.; Krasheninnikov, S. I.; Pigarov, A. Yu.; Rognlien, T. D.

doi:10.1063/1.4939539

Title: Impurity-induced divertor plasma oscillations

Journal Article · Thu Jan 07 00:00:00 EST 2016 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4939539· OSTI ID:1234254

^[1];

^[2]; Krasheninnikov, S. I. ^[1]; Pigarov, A. Yu. ^[1]; Rognlien, T. D. ^[3]

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)

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.

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Research Organization:: Univ. of California, San Diego, La Jolla, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: FG02-06ER54852; AC52-07NA27344; FG02-04ER54739

OSTI ID:: 1234254

Alternate ID(s):: OSTI ID: 1234151; OSTI ID: 1343030

Report Number(s):: LLNL-JRNL-678528; PHPAEN; FG02-04ER54739, AC52-07NA27344

Journal Information:: Physics of Plasmas, Vol. 23, Issue 1; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 19 works

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Impact of divertor plasma parameters on characteristics of current-convective turbulence under DIII-D-like detached conditions Stepanenko, A. A.; Wang, H. Q.; Krasheninnikov, S. I. Physics of Plasmas, Vol. 26, Issue 12 https://doi.org/10.1063/1.5123388	journal	December 2019
A review of direct experimental measurements of detachment Boedo, J.; McLean, A. G.; Rudakov, D. L. Plasma Physics and Controlled Fusion, Vol. 60, Issue 4 https://doi.org/10.1088/1361-6587/aaa2ec	journal	February 2018
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Edge and divertor plasma: detachment, stability, and plasma-wall interactions Krasheninnikov, S. I.; Kukushkin, A. S.; Lee, Wonjae Nuclear Fusion, Vol. 57, Issue 10 https://doi.org/10.1088/1741-4326/aa6d25	journal	June 2017
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70 PLASMA PHYSICS AND FUSION

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