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Title: Impact of cross-field motion on ablation of high-Z dust in fusion edge plasmas

Abstract

The impact of cross-field motion of high-Z dust grains on their shielding by ablation cloud in edge plasmas of tokamaks is analyzed. The modification of the existing high-Z dust shielding theory is developed, which takes the dust motion effects into account. We show that the cross-field motion can lead to a large factor increase of the dust ablation rate, as compared to the previous model. It is also shown that the motion effects take place when the dust cross-field velocity exceeds a threshold value. We also obtain the dependencies of the dust ablation flux on the dust velocity and of the threshold velocity on the dust size and the ambient plasma temperature.

Authors:
ORCiD logo [1];  [1]
  1. Univ. of California, San Diego, CA (United States). Mechanical and Aerospace Engineering Dept.
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:
1367914
Alternate Identifier(s):
OSTI ID: 1367934
Grant/Contract Number:  
FG02-06ER54852
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 7; 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

Smirnov, R. D., and Krasheninnikov, S. I. Impact of cross-field motion on ablation of high-Z dust in fusion edge plasmas. United States: N. p., 2017. Web. doi:10.1063/1.4990434.
Smirnov, R. D., & Krasheninnikov, S. I. Impact of cross-field motion on ablation of high-Z dust in fusion edge plasmas. United States. doi:10.1063/1.4990434.
Smirnov, R. D., and Krasheninnikov, S. I. Wed . "Impact of cross-field motion on ablation of high-Z dust in fusion edge plasmas". United States. doi:10.1063/1.4990434. https://www.osti.gov/servlets/purl/1367914.
@article{osti_1367914,
title = {Impact of cross-field motion on ablation of high-Z dust in fusion edge plasmas},
author = {Smirnov, R. D. and Krasheninnikov, S. I.},
abstractNote = {The impact of cross-field motion of high-Z dust grains on their shielding by ablation cloud in edge plasmas of tokamaks is analyzed. The modification of the existing high-Z dust shielding theory is developed, which takes the dust motion effects into account. We show that the cross-field motion can lead to a large factor increase of the dust ablation rate, as compared to the previous model. It is also shown that the motion effects take place when the dust cross-field velocity exceeds a threshold value. We also obtain the dependencies of the dust ablation flux on the dust velocity and of the threshold velocity on the dust size and the ambient plasma temperature.},
doi = {10.1063/1.4990434},
journal = {Physics of Plasmas},
number = 7,
volume = 24,
place = {United States},
year = {2017},
month = {7}
}

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