Plasma cleaning of beryllium coated mirrors

L. Moser; L. Marot; R. Steiner; M. Newman; A. Widdowson; D. Ivanova; Jari Likonen; P. Petersson; G. Pintsuk; M. Rubel; E. Meyer; JET Contributors

doi:10.1088/0031-8949/T167/1/014069

Plasma cleaning of beryllium coated mirrors

L. Moser (Corresponding Author), L. Marot, R. Steiner, M. Newman, A. Widdowson, D. Ivanova, Jari Likonen, P. Petersson, G. Pintsuk, M. Rubel, E. Meyer, JET Contributors

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

27 Citations (Scopus)

Abstract

Cleaning systems of metallic first mirrors are needed in more than 20 optical diagnostic systems from ITER to avoid reflectivity losses. Currently, plasma sputtering is considered as one of the most promising techniques to remove deposits coming from the main wall (mainly beryllium and tungsten). This work presents the results of plasma cleaning of rhodium and molybdenum mirrors exposed in JET-ILW and contaminated with typical tokamak elements (including beryllium and tungsten). Using radio frequency (13.56 MHz) argon or helium plasma, the removal of mixed layers was demonstrated and mirror reflectivity improved towards initial values. The cleaning was evaluated by performing reflectivity measurements, scanning electron microscopy, x-ray photoelectron spectroscopy and ion beam analysis.

Original language	English
Number of pages	6
Journal	Physica Scripta
Volume	2016
Issue number	T167
DOIs	https://doi.org/10.1088/0031-8949/T167/1/014069
Publication status	Published - 2016
MoE publication type	A1 Journal article-refereed

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10.1088/0031-8949/T167/1/014069

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title = "Plasma cleaning of beryllium coated mirrors",

abstract = "Cleaning systems of metallic first mirrors are needed in more than 20 optical diagnostic systems from ITER to avoid reflectivity losses. Currently, plasma sputtering is considered as one of the most promising techniques to remove deposits coming from the main wall (mainly beryllium and tungsten). This work presents the results of plasma cleaning of rhodium and molybdenum mirrors exposed in JET-ILW and contaminated with typical tokamak elements (including beryllium and tungsten). Using radio frequency (13.56 MHz) argon or helium plasma, the removal of mixed layers was demonstrated and mirror reflectivity improved towards initial values. The cleaning was evaluated by performing reflectivity measurements, scanning electron microscopy, x-ray photoelectron spectroscopy and ion beam analysis.",

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T1 - Plasma cleaning of beryllium coated mirrors

AU - Moser, L.

AU - Marot, L.

AU - Steiner, R.

AU - Newman, M.

AU - Widdowson, A.

AU - Ivanova, D.

AU - Likonen, Jari

AU - Petersson, P.

AU - Pintsuk, G.

AU - Rubel, M.

AU - Meyer, E.

AU - JET Contributors

N1 - Project code: 104445

PY - 2016

Y1 - 2016

N2 - Cleaning systems of metallic first mirrors are needed in more than 20 optical diagnostic systems from ITER to avoid reflectivity losses. Currently, plasma sputtering is considered as one of the most promising techniques to remove deposits coming from the main wall (mainly beryllium and tungsten). This work presents the results of plasma cleaning of rhodium and molybdenum mirrors exposed in JET-ILW and contaminated with typical tokamak elements (including beryllium and tungsten). Using radio frequency (13.56 MHz) argon or helium plasma, the removal of mixed layers was demonstrated and mirror reflectivity improved towards initial values. The cleaning was evaluated by performing reflectivity measurements, scanning electron microscopy, x-ray photoelectron spectroscopy and ion beam analysis.

AB - Cleaning systems of metallic first mirrors are needed in more than 20 optical diagnostic systems from ITER to avoid reflectivity losses. Currently, plasma sputtering is considered as one of the most promising techniques to remove deposits coming from the main wall (mainly beryllium and tungsten). This work presents the results of plasma cleaning of rhodium and molybdenum mirrors exposed in JET-ILW and contaminated with typical tokamak elements (including beryllium and tungsten). Using radio frequency (13.56 MHz) argon or helium plasma, the removal of mixed layers was demonstrated and mirror reflectivity improved towards initial values. The cleaning was evaluated by performing reflectivity measurements, scanning electron microscopy, x-ray photoelectron spectroscopy and ion beam analysis.

U2 - 10.1088/0031-8949/T167/1/014069

DO - 10.1088/0031-8949/T167/1/014069

M3 - Article

SN - 0031-8949

VL - 2016

JO - Physica Scripta

JF - Physica Scripta

IS - T167

ER -

Plasma cleaning of beryllium coated mirrors

Abstract

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