Performances of Rh and Mo mirrors under JET exposure

Laurent Marot; E. Meyer; M. Rubel; D. Ivanova; A. Widdowson; J.P. Coad; Jari Likonen; Antti Hakola; Seppo Koivuranta; G. De Temmerman; JET-EFDA contributors

doi:10.1016/j.jnucmat.2013.01.262

Performances of Rh and Mo mirrors under JET exposure

Laurent Marot^*
, E. Meyer
, M. Rubel
, D. Ivanova
, A. Widdowson
, J.P. Coad
, Jari Likonen
, Antti Hakola
, Seppo Koivuranta
, G. De Temmerman
, JET-EFDA contributors

^*Corresponding author for this work

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

17 Citations (Scopus)

Abstract

The aim of this work was to provide a comprehensive surface characterization of rhodium and molybdenum mirrors exposed on the main chamber wall of JET during campaigns with carbon plasma-facing components. As determined using X-ray photoelectron spectroscopy, Secondary Ion Mass Spectrometry, Scanning Electron Microscopy and optical measurements the co-deposits formed on the mirrors were composed of C, Be, Ni, Mo and Fe. Most of the metallic elements on the surface were in the oxidized states. After removing a part of the film by sputtering with Ar+ ions, Mo carbide state was studied by XPS. The reflectivity measurements showed the dependence of the thickness of the deposited film on the optical properties of the mirror: a thinner film on the Mo mirrors results in an identical reduction in reflectivity as that seen on the exposed Rh mirror.

Original language	English
Pages (from-to)	S1187-S1191
Journal	Journal of Nuclear Materials
Volume	438
Issue number	Supplement
DOIs	https://doi.org/10.1016/j.jnucmat.2013.01.262
Publication status	Published - 2013
MoE publication type	A1 Journal article-refereed
Event	20th International Conference on Plasma-Surface Interactions in Controlled Fusion Devices - Aachen, Aachen, Germany Duration: 21 May 2012 → 25 May 2012

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10.1016/j.jnucmat.2013.01.262

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title = "Performances of Rh and Mo mirrors under JET exposure",

abstract = "The aim of this work was to provide a comprehensive surface characterization of rhodium and molybdenum mirrors exposed on the main chamber wall of JET during campaigns with carbon plasma-facing components. As determined using X-ray photoelectron spectroscopy, Secondary Ion Mass Spectrometry, Scanning Electron Microscopy and optical measurements the co-deposits formed on the mirrors were composed of C, Be, Ni, Mo and Fe. Most of the metallic elements on the surface were in the oxidized states. After removing a part of the film by sputtering with Ar+ ions, Mo carbide state was studied by XPS. The reflectivity measurements showed the dependence of the thickness of the deposited film on the optical properties of the mirror: a thinner film on the Mo mirrors results in an identical reduction in reflectivity as that seen on the exposed Rh mirror.",

author = "Laurent Marot and E. Meyer and M. Rubel and D. Ivanova and A. Widdowson and J.P. Coad and Jari Likonen and Antti Hakola and Seppo Koivuranta and \{De Temmerman\}, G. and \{JET-EFDA contributors\}",

year = "2013",

doi = "10.1016/j.jnucmat.2013.01.262",

language = "English",

volume = "438",

pages = "S1187--S1191",

journal = "Journal of Nuclear Materials",

issn = "0022-3115",

publisher = "Elsevier",

number = "Supplement",

note = "20th International Conference on Plasma-Surface Interactions in Controlled Fusion Devices, PSI-20 ; Conference date: 21-05-2012 Through 25-05-2012",

}

TY - JOUR

T1 - Performances of Rh and Mo mirrors under JET exposure

AU - Marot, Laurent

AU - Meyer, E.

AU - Rubel, M.

AU - Ivanova, D.

AU - Widdowson, A.

AU - Coad, J.P.

AU - Likonen, Jari

AU - Hakola, Antti

AU - Koivuranta, Seppo

AU - De Temmerman, G.

AU - JET-EFDA contributors

PY - 2013

Y1 - 2013

N2 - The aim of this work was to provide a comprehensive surface characterization of rhodium and molybdenum mirrors exposed on the main chamber wall of JET during campaigns with carbon plasma-facing components. As determined using X-ray photoelectron spectroscopy, Secondary Ion Mass Spectrometry, Scanning Electron Microscopy and optical measurements the co-deposits formed on the mirrors were composed of C, Be, Ni, Mo and Fe. Most of the metallic elements on the surface were in the oxidized states. After removing a part of the film by sputtering with Ar+ ions, Mo carbide state was studied by XPS. The reflectivity measurements showed the dependence of the thickness of the deposited film on the optical properties of the mirror: a thinner film on the Mo mirrors results in an identical reduction in reflectivity as that seen on the exposed Rh mirror.

AB - The aim of this work was to provide a comprehensive surface characterization of rhodium and molybdenum mirrors exposed on the main chamber wall of JET during campaigns with carbon plasma-facing components. As determined using X-ray photoelectron spectroscopy, Secondary Ion Mass Spectrometry, Scanning Electron Microscopy and optical measurements the co-deposits formed on the mirrors were composed of C, Be, Ni, Mo and Fe. Most of the metallic elements on the surface were in the oxidized states. After removing a part of the film by sputtering with Ar+ ions, Mo carbide state was studied by XPS. The reflectivity measurements showed the dependence of the thickness of the deposited film on the optical properties of the mirror: a thinner film on the Mo mirrors results in an identical reduction in reflectivity as that seen on the exposed Rh mirror.

U2 - 10.1016/j.jnucmat.2013.01.262

DO - 10.1016/j.jnucmat.2013.01.262

M3 - Article

SN - 0022-3115

VL - 438

SP - S1187-S1191

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

IS - Supplement

T2 - 20th International Conference on Plasma-Surface Interactions in Controlled Fusion Devices

Y2 - 21 May 2012 through 25 May 2012

ER -

Performances of Rh and Mo mirrors under JET exposure

Abstract

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