Transient heating effects on tungsten: Ablation of Be layers and enhanced fuzz growth

J.H. Yu (Corresponding Author), M.J. Baldwin, R.P. Doerner, T. Dittmar, A. Hakola, T. Höschen, J. Likonen, D. Nishijima, H.H. Toudeshki

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

A pulsed laser in the PISCES-B facility is used to simulate transient heating events such as ELMs and disruptions on W. The first study of enhanced nano-scale W tendril growth (''fuzz'') due to cyclic fast transient heating of W exposed to low energy (EHe+ 30 eV) He+ ions is presented. Fuzz due to transient heating is up to 10 thicker than the steady state fuzz thickness with no laser heating. A general thermal activation model yields higher values for the activation energy and pre-exponential factor than previously reported in steady state experiments with EHe+ 60 eV. Transient heating of W exposed to D plasma with Be seeding shows that the removal threshold of Be follows simple energy considerations based on the heat of formation of Be.
Original languageEnglish
Pages (from-to)299-302
JournalJournal of Nuclear Materials
Volume463
DOIs
Publication statusPublished - 2015
MoE publication typeA1 Journal article-refereed

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transient heating
Tungsten
Ablation
ablation
tungsten
Heating
Laser heating
laser heating
heat of formation
inoculation
Pulsed lasers
pulsed lasers
Activation energy
Chemical activation
activation
Ions
activation energy
Plasmas
thresholds
energy

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Yu, J. H., Baldwin, M. J., Doerner, R. P., Dittmar, T., Hakola, A., Höschen, T., ... Toudeshki, H. H. (2015). Transient heating effects on tungsten: Ablation of Be layers and enhanced fuzz growth. Journal of Nuclear Materials, 463, 299-302. https://doi.org/10.1016/j.jnucmat.2014.10.035
Yu, J.H. ; Baldwin, M.J. ; Doerner, R.P. ; Dittmar, T. ; Hakola, A. ; Höschen, T. ; Likonen, J. ; Nishijima, D. ; Toudeshki, H.H. / Transient heating effects on tungsten: Ablation of Be layers and enhanced fuzz growth. In: Journal of Nuclear Materials. 2015 ; Vol. 463. pp. 299-302.
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abstract = "A pulsed laser in the PISCES-B facility is used to simulate transient heating events such as ELMs and disruptions on W. The first study of enhanced nano-scale W tendril growth (''fuzz'') due to cyclic fast transient heating of W exposed to low energy (EHe+ 30 eV) He+ ions is presented. Fuzz due to transient heating is up to 10 thicker than the steady state fuzz thickness with no laser heating. A general thermal activation model yields higher values for the activation energy and pre-exponential factor than previously reported in steady state experiments with EHe+ 60 eV. Transient heating of W exposed to D plasma with Be seeding shows that the removal threshold of Be follows simple energy considerations based on the heat of formation of Be.",
author = "J.H. Yu and M.J. Baldwin and R.P. Doerner and T. Dittmar and A. Hakola and T. H{\"o}schen and J. Likonen and D. Nishijima and H.H. Toudeshki",
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Yu, JH, Baldwin, MJ, Doerner, RP, Dittmar, T, Hakola, A, Höschen, T, Likonen, J, Nishijima, D & Toudeshki, HH 2015, 'Transient heating effects on tungsten: Ablation of Be layers and enhanced fuzz growth', Journal of Nuclear Materials, vol. 463, pp. 299-302. https://doi.org/10.1016/j.jnucmat.2014.10.035

Transient heating effects on tungsten: Ablation of Be layers and enhanced fuzz growth. / Yu, J.H. (Corresponding Author); Baldwin, M.J.; Doerner, R.P.; Dittmar, T.; Hakola, A.; Höschen, T.; Likonen, J.; Nishijima, D.; Toudeshki, H.H.

In: Journal of Nuclear Materials, Vol. 463, 2015, p. 299-302.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Transient heating effects on tungsten: Ablation of Be layers and enhanced fuzz growth

AU - Yu, J.H.

AU - Baldwin, M.J.

AU - Doerner, R.P.

AU - Dittmar, T.

AU - Hakola, A.

AU - Höschen, T.

AU - Likonen, J.

AU - Nishijima, D.

AU - Toudeshki, H.H.

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PY - 2015

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N2 - A pulsed laser in the PISCES-B facility is used to simulate transient heating events such as ELMs and disruptions on W. The first study of enhanced nano-scale W tendril growth (''fuzz'') due to cyclic fast transient heating of W exposed to low energy (EHe+ 30 eV) He+ ions is presented. Fuzz due to transient heating is up to 10 thicker than the steady state fuzz thickness with no laser heating. A general thermal activation model yields higher values for the activation energy and pre-exponential factor than previously reported in steady state experiments with EHe+ 60 eV. Transient heating of W exposed to D plasma with Be seeding shows that the removal threshold of Be follows simple energy considerations based on the heat of formation of Be.

AB - A pulsed laser in the PISCES-B facility is used to simulate transient heating events such as ELMs and disruptions on W. The first study of enhanced nano-scale W tendril growth (''fuzz'') due to cyclic fast transient heating of W exposed to low energy (EHe+ 30 eV) He+ ions is presented. Fuzz due to transient heating is up to 10 thicker than the steady state fuzz thickness with no laser heating. A general thermal activation model yields higher values for the activation energy and pre-exponential factor than previously reported in steady state experiments with EHe+ 60 eV. Transient heating of W exposed to D plasma with Be seeding shows that the removal threshold of Be follows simple energy considerations based on the heat of formation of Be.

U2 - 10.1016/j.jnucmat.2014.10.035

DO - 10.1016/j.jnucmat.2014.10.035

M3 - Article

VL - 463

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EP - 302

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

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