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

J.H. Yu; M.J. Baldwin; R.P. Doerner; T. Dittmar; Antti Hakola; T. Höschen; Jari Likonen; D. Nishijima; H.H. Toudeshki

doi:10.1016/j.jnucmat.2014.10.035

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

J.H. Yu^*, M.J. Baldwin, R.P. Doerner, T. Dittmar, Antti Hakola, T. Höschen, Jari Likonen, D. Nishijima, H.H. Toudeshki

^*Corresponding author for this work

Research output: Contribution to journal › Article › Scientific › peer-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 language	English
Pages (from-to)	299-302
Journal	Journal of Nuclear Materials
Volume	463
DOIs	https://doi.org/10.1016/j.jnucmat.2014.10.035
Publication status	Published - 2015
MoE publication type	A1 Journal article-refereed

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title = "Transient heating effects on tungsten: Ablation of Be layers and enhanced fuzz growth",

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 Antti Hakola and T. H{\"o}schen and Jari Likonen and D. Nishijima and H.H. Toudeshki",

note = "Project code: 104445 ",

year = "2015",

doi = "10.1016/j.jnucmat.2014.10.035",

language = "English",

volume = "463",

pages = "299--302",

journal = "Journal of Nuclear Materials",

issn = "0022-3115",

publisher = "Elsevier",

}

TY - JOUR

T1 - Transient heating effects on tungsten

T2 - 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, Antti

AU - Höschen, T.

AU - Likonen, Jari

AU - Nishijima, D.

AU - Toudeshki, H.H.

N1 - Project code: 104445

PY - 2015

Y1 - 2015

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

SN - 0022-3115

VL - 463

SP - 299

EP - 302

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

ER -

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

Abstract

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