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

Smirnov, R. D.; Krasheninnikov, S. I.

doi:10.1063/1.4990434

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

Journal Article · Wed Jul 05 00:00:00 EDT 2017 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4990434· OSTI ID:1367914

^[1]; Krasheninnikov, S. I. ^[1]

Univ. of California, San Diego, CA (United States). Mechanical and Aerospace Engineering Dept.

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.

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Research Organization:: Univ. of California, San Diego, CA (United States)

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

Grant/Contract Number:: FG02-06ER54852

OSTI ID:: 1367914

Alternate ID(s):: OSTI ID: 1367934

Journal Information:: Physics of Plasmas, Vol. 24, Issue 7; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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