Modelling the erosion of beryllium carbide surfaces

M. Mehine (Corresponding Author), C. Björkas, K. Vörtler, K. Nordlund, Markus Airila

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)

Abstract

Redeposition of beryllium eroded from main chamber plasma facing components of ITER onto the divertor material carbon creates a mixed material, beryllium carbide Be2C, whose interaction with the plasma is not well known. In this study, we have investigated the erosion of Be2C by deuterium using molecular dynamics simulations and ERO impurity modelling. We found that beryllium sputters preferentially over carbon and identified the sputtering mechanism in the ion energy range 10–100 eV to be both physical and swift chemical sputtering. In addition to single atoms, different types of small molecules/clusters were sputtered, the most frequently occurring molecules being BeD, Be2D, and CD. The sputtering threshold was found to lie between 10 and 15 eV. The MD sputtering yields were used in plasma impurity simulations, serving as a replacement for input data obtained with TRIM. This changes the accumulation rate of impurity Be in the divertor region compared to previous estimates.
Original languageEnglish
Pages (from-to)1-7
Number of pages7
JournalJournal of Nuclear Materials
Volume414
Issue number1
DOIs
Publication statusPublished - 2011
MoE publication typeA1 Journal article-refereed

Fingerprint

Beryllium
beryllium
carbides
erosion
Sputtering
Carbides
Erosion
sputtering
Impurities
Plasmas
impurities
Carbon
Molecules
Deuterium
carbon
Beam plasma interactions
Molecular dynamics
molecules
deuterium
simulation

Cite this

Mehine, M. ; Björkas, C. ; Vörtler, K. ; Nordlund, K. ; Airila, Markus. / Modelling the erosion of beryllium carbide surfaces. In: Journal of Nuclear Materials. 2011 ; Vol. 414, No. 1. pp. 1-7.
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Modelling the erosion of beryllium carbide surfaces. / Mehine, M. (Corresponding Author); Björkas, C.; Vörtler, K.; Nordlund, K.; Airila, Markus.

In: Journal of Nuclear Materials, Vol. 414, No. 1, 2011, p. 1-7.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Modelling the erosion of beryllium carbide surfaces

AU - Mehine, M.

AU - Björkas, C.

AU - Vörtler, K.

AU - Nordlund, K.

AU - Airila, Markus

PY - 2011

Y1 - 2011

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AB - Redeposition of beryllium eroded from main chamber plasma facing components of ITER onto the divertor material carbon creates a mixed material, beryllium carbide Be2C, whose interaction with the plasma is not well known. In this study, we have investigated the erosion of Be2C by deuterium using molecular dynamics simulations and ERO impurity modelling. We found that beryllium sputters preferentially over carbon and identified the sputtering mechanism in the ion energy range 10–100 eV to be both physical and swift chemical sputtering. In addition to single atoms, different types of small molecules/clusters were sputtered, the most frequently occurring molecules being BeD, Be2D, and CD. The sputtering threshold was found to lie between 10 and 15 eV. The MD sputtering yields were used in plasma impurity simulations, serving as a replacement for input data obtained with TRIM. This changes the accumulation rate of impurity Be in the divertor region compared to previous estimates.

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