Tungsten dust impact on ITER-like plasma edge

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

doi:10.1063/1.4905704

Tungsten dust impact on ITER-like plasma edge

Journal Article · Mon Jan 12 00:00:00 EST 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4905704· OSTI ID:1274048

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

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

The impact of tungsten dust originating from divertor plates on the performance of edge plasma in ITER-like discharge is evaluated using computer modeling with the coupled dust-plasma transport code DUSTT-UEDGE. Different dust injection parameters, including dust size and mass injection rates, are surveyed. It is found that tungsten dust injection with rates as low as a few mg/s can lead to dangerously high tungsten impurity concentrations in the plasma core. Dust injections with rates of a few tens of mg/s are shown to have a significant effect on edge plasma parameters and dynamics in ITER scale tokamaks. The large impact of certain phenomena, such as dust shielding by an ablation cloud and the thermal force on tungsten ions, on dust/impurity transport in edge plasma and consequently on core tungsten contamination level is demonstrated. Lastly, it is also found that high-Z impurities provided by dust can induce macroscopic self-sustained plasma oscillations in plasma edge leading to large temporal variations of edge plasma parameters and heat load to divertor target plates.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

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

OSTI ID:: 1274048

Alternate ID(s):: OSTI ID: 1228486
OSTI ID: 22408002

Report Number(s):: LLNL-JRNL--678548

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 1 Vol. 22; ISSN PHPAEN; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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