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Title: Tungsten dust impact on ITER-like plasma edge

Abstract

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.

Authors:
 [1];  [1];  [1];  [2]
  1. Univ. of California San Diego, La Jolla, CA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1274048
Alternate Identifier(s):
OSTI ID: 1228486
Report Number(s):
LLNL-JRNL-678548
Journal ID: ISSN 1070-664X; PHPAEN
Grant/Contract Number:  
AC52-07NA27344; FG02-06ER54852
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 22; 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; tungsten; plasma impurities; divertors; plasma temperature; plasma transport properties

Citation Formats

Smirnov, R. D., Krasheninnikov, S. I., Pigarov, A. Yu., and Rognlien, T. D. Tungsten dust impact on ITER-like plasma edge. United States: N. p., 2015. Web. doi:10.1063/1.4905704.
Smirnov, R. D., Krasheninnikov, S. I., Pigarov, A. Yu., & Rognlien, T. D. Tungsten dust impact on ITER-like plasma edge. United States. https://doi.org/10.1063/1.4905704
Smirnov, R. D., Krasheninnikov, S. I., Pigarov, A. Yu., and Rognlien, T. D. 2015. "Tungsten dust impact on ITER-like plasma edge". United States. https://doi.org/10.1063/1.4905704. https://www.osti.gov/servlets/purl/1274048.
@article{osti_1274048,
title = {Tungsten dust impact on ITER-like plasma edge},
author = {Smirnov, R. D. and Krasheninnikov, S. I. and Pigarov, A. Yu. and Rognlien, T. D.},
abstractNote = {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.},
doi = {10.1063/1.4905704},
url = {https://www.osti.gov/biblio/1274048}, journal = {Physics of Plasmas},
issn = {1070-664X},
number = 1,
volume = 22,
place = {United States},
year = {Mon Jan 12 00:00:00 EST 2015},
month = {Mon Jan 12 00:00:00 EST 2015}
}

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Cited by: 25 works
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Works referenced in this record:

Impurity Seeding with Dust Injection in Tokamak Edge Plasmas
journal, June 2012


Steady-state radiative cooling rates for low-density, high-temperature plasmas
journal, November 1977


On vapor shielding of dust grains of iron, molybdenum, and tungsten in fusion plasmas
journal, February 2014


Transient impurity events in JET with the new ITER-like wall
journal, April 2014


Analysis of performance of the optimized divertor in ITER
journal, May 2009


Calculation and experimental test of the cooling factor of tungsten
journal, January 2010


Recent analysis of key plasma wall interactions issues for ITER
journal, June 2009


Dust generation mechanisms under powerful plasma impacts to the tungsten surfaces in ITER ELM simulation experiments
journal, July 2013


On interaction of large dust grains with fusion plasma
journal, November 2009


On ablation of large Tungsten dust grains in edge plasma of fusion devices
journal, August 2015


Formation of Nanostructured Tungsten with Arborescent Shape due to Helium Plasma Irradiation
journal, January 2006


Measurement of number density and size distribution of dust in DIII-D during normal plasma operation
journal, October 2006


Divertor tungsten tile melting and its effect on core plasma performance
journal, October 2012


3D measurements of mobile dust particle trajectories in NSTX
journal, June 2007


Modelling of dynamics and transport of carbon dust particles in tokamaks
journal, February 2007


Controlled tungsten melting and droplet ejection studies in ASDEX Upgrade
journal, December 2011


Dust in magnetic confinement fusion devices and its impact on plasma operation
journal, March 1999


Dust in magnetic fusion devices
journal, May 2011


Analysis of tungsten melt-layer motion and splashing under tokamak conditions at TEXTOR
journal, July 2011


Research status and issues of tungsten plasma facing materials for ITER and beyond
journal, October 2014


Simulation of Detachment in ITER-Geometry Using the UEDGE Code and a Fluid Neutral Model
journal, January 1996


3-D reconstruction of pre-characterized lithium and tungsten dust particle trajectories in NSTX
journal, August 2011


A full tungsten divertor for ITER: Physics issues and design status
journal, July 2013


A Comparison of Neutral Gas Models for Divertor Plasmas
journal, January 1998


Performance of different tungsten grades under transient thermal loads
journal, June 2011


Key ITER plasma edge and plasma–material interaction issues
journal, March 2003


Observation of dust particles by a laser scattering method in the JIPPT-IIU tokamak
journal, August 1997


Modeling of dust impact on tokamak edge plasmas
journal, August 2011


Dust-particle transport in tokamak edge plasmas
journal, December 2005


Behavior of tungsten exposed to high fluences of low energy hydrogen isotopes
journal, March 2001


Scaling laws for edge plasma parameters in ITER from two-dimensional edge modelling
journal, August 2003


Dust studies in DIII-D and TEXTOR
journal, July 2009


Video tracking and post-mortem analysis of dust particles from all tungsten ASDEX Upgrade
journal, August 2011


A review of dust in fusion devices: Implications for safety and operational performance
journal, December 2002


Marfes: Radiative condensation in tokamak edge plasma
journal, January 1987


A fully implicit, time dependent 2-D fluid code for modeling tokamak edge plasmas
journal, December 1992


Works referencing / citing this record:

Experimental and modeling study of chemical-based strategies for mitigating dust formation in fusion reactors
journal, February 2019


Survival and in-vessel redistribution of beryllium droplets after ITER disruptions
journal, May 2018


Pre-plasma remobilization of ferromagnetic dust in FTU and possible interference with tokamak operations
journal, September 2019