Erosion/deposition in JET during the period 1999-2001

J.P. Coad; P. Andrew; D.E. Hole; S. Lehto; J. Likonen; G.F. Matthews; M. Rubel; JET-EFDA collaborators

doi:10.1016/S0022-3115(02)01403-4

Erosion/deposition in JET during the period 1999-2001

J.P. Coad (Corresponding Author), P. Andrew, D.E. Hole, S. Lehto, J. Likonen, G.F. Matthews, M. Rubel, JET-EFDA collaborators

VTT Technical Research Centre of Finland

Research output: Contribution to journal › Article › Scientific › peer-review

76 Citations (Scopus)

Abstract

Coated divertor and wall tiles exposed in JET for the 1999–2001 operations have been used to assess erosion/deposition. Deposited films of up to 90 μm thickness at the inner wall of the divertor tiles are, for the most part, enriched in beryllium and other metals, whilst carbon is probably chemically sputtered from these tiles and transported to shadowed regions of the inner divertor. However, from the composition at the surface of the tiles, it appears that the chemical erosion was ‘switched off’ by reducing the JET vessel wall temperature for the last part of the operations to 200 °C. Thick powdery deposits localised at the ion transport limit at each corner of the divertor may be due to physical sputtering. Erosion of the coatings is seen at the outer divertor wall, and on all the inner wall and outer limiter tiles.

Original language	English
Pages (from-to)	419-423
Journal	Journal of Nuclear Materials
Volume	313-316
DOIs	https://doi.org/10.1016/S0022-3115(02)01403-4
Publication status	Published - 2003
MoE publication type	A1 Journal article-refereed
Event	Plasma-Surface Interactions in Controlled Fusion Devices 15 - Gifu, Japan Duration: 26 May 2002 → 31 May 2002

Keywords

plasma-wall interactions
divertor
tritium retention
rutherford backscattering
SIMS
fusion energy
fusion reactors
JET

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@article{f03846bd96e54019944be6dd02b2eff8,

title = "Erosion/deposition in JET during the period 1999-2001",

abstract = "Coated divertor and wall tiles exposed in JET for the 1999–2001 operations have been used to assess erosion/deposition. Deposited films of up to 90 μm thickness at the inner wall of the divertor tiles are, for the most part, enriched in beryllium and other metals, whilst carbon is probably chemically sputtered from these tiles and transported to shadowed regions of the inner divertor. However, from the composition at the surface of the tiles, it appears that the chemical erosion was {\textquoteleft}switched off{\textquoteright} by reducing the JET vessel wall temperature for the last part of the operations to 200 °C. Thick powdery deposits localised at the ion transport limit at each corner of the divertor may be due to physical sputtering. Erosion of the coatings is seen at the outer divertor wall, and on all the inner wall and outer limiter tiles.",

keywords = "plasma-wall interactions, divertor, tritium retention, rutherford backscattering, SIMS, fusion energy, fusion reactors, JET",

author = "J.P. Coad and P. Andrew and D.E. Hole and S. Lehto and J. Likonen and G.F. Matthews and M. Rubel and {JET-EFDA collaborators}",

year = "2003",

doi = "10.1016/S0022-3115(02)01403-4",

language = "English",

volume = "313-316",

pages = "419--423",

journal = "Journal of Nuclear Materials",

issn = "0022-3115",

publisher = "Elsevier",

note = "Plasma-Surface Interactions in Controlled Fusion Devices 15, PSI-15 ; Conference date: 26-05-2002 Through 31-05-2002",

}

TY - JOUR

T1 - Erosion/deposition in JET during the period 1999-2001

AU - Coad, J.P.

AU - Andrew, P.

AU - Hole, D.E.

AU - Lehto, S.

AU - Likonen, J.

AU - Matthews, G.F.

AU - Rubel, M.

AU - JET-EFDA collaborators

PY - 2003

Y1 - 2003

N2 - Coated divertor and wall tiles exposed in JET for the 1999–2001 operations have been used to assess erosion/deposition. Deposited films of up to 90 μm thickness at the inner wall of the divertor tiles are, for the most part, enriched in beryllium and other metals, whilst carbon is probably chemically sputtered from these tiles and transported to shadowed regions of the inner divertor. However, from the composition at the surface of the tiles, it appears that the chemical erosion was ‘switched off’ by reducing the JET vessel wall temperature for the last part of the operations to 200 °C. Thick powdery deposits localised at the ion transport limit at each corner of the divertor may be due to physical sputtering. Erosion of the coatings is seen at the outer divertor wall, and on all the inner wall and outer limiter tiles.

AB - Coated divertor and wall tiles exposed in JET for the 1999–2001 operations have been used to assess erosion/deposition. Deposited films of up to 90 μm thickness at the inner wall of the divertor tiles are, for the most part, enriched in beryllium and other metals, whilst carbon is probably chemically sputtered from these tiles and transported to shadowed regions of the inner divertor. However, from the composition at the surface of the tiles, it appears that the chemical erosion was ‘switched off’ by reducing the JET vessel wall temperature for the last part of the operations to 200 °C. Thick powdery deposits localised at the ion transport limit at each corner of the divertor may be due to physical sputtering. Erosion of the coatings is seen at the outer divertor wall, and on all the inner wall and outer limiter tiles.

KW - plasma-wall interactions

KW - divertor

KW - tritium retention

KW - rutherford backscattering

KW - SIMS

KW - fusion energy

KW - fusion reactors

KW - JET

U2 - 10.1016/S0022-3115(02)01403-4

DO - 10.1016/S0022-3115(02)01403-4

M3 - Article

VL - 313-316

SP - 419

EP - 423

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

SN - 0022-3115

T2 - Plasma-Surface Interactions in Controlled Fusion Devices 15

Y2 - 26 May 2002 through 31 May 2002

ER -