Plasma cleaning of beryllium coated mirrors

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

Research output: Contribution to journalArticleScientificpeer-review

8 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 languageEnglish
Number of pages6
JournalPhysica Scripta
Volume2016
Issue numberT167
DOIs
Publication statusPublished - 2016
MoE publication typeA1 Journal article-refereed

Fingerprint

Cleaning
Reflectivity
beryllium
cleaning
Mirror
Plasma
mirrors
reflectance
tungsten
helium plasma
Sputtering
X-ray Spectroscopy
argon plasma
Scanning Electron Microscopy
rhodium
x ray spectroscopy
molybdenum
Diagnostics
radio frequencies
sputtering

Cite this

Moser, L., Marot, L., Steiner, R., Newman, M., Widdowson, A., Ivanova, D., ... Contributors, JET. (2016). Plasma cleaning of beryllium coated mirrors. Physica Scripta, 2016(T167). https://doi.org/10.1088/0031-8949/T167/1/014069
Moser, L. ; Marot, L. ; Steiner, R. ; Newman, M. ; Widdowson, A. ; Ivanova, D. ; Likonen, J. ; Petersson, P. ; Pintsuk, G. ; Rubel, M. ; Meyer, E. ; Contributors, JET. / Plasma cleaning of beryllium coated mirrors. In: Physica Scripta. 2016 ; Vol. 2016, No. T167.
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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.",
author = "L. Moser and L. Marot and R. Steiner and M. Newman and A. Widdowson and D. Ivanova and J. Likonen and P. Petersson and G. Pintsuk and M. Rubel and E. Meyer and JET Contributors",
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Moser, L, Marot, L, Steiner, R, Newman, M, Widdowson, A, Ivanova, D, Likonen, J, Petersson, P, Pintsuk, G, Rubel, M, Meyer, E & Contributors, JET 2016, 'Plasma cleaning of beryllium coated mirrors', Physica Scripta, vol. 2016, no. T167. https://doi.org/10.1088/0031-8949/T167/1/014069

Plasma cleaning of beryllium coated mirrors. / Moser, L. (Corresponding Author); Marot, L.; Steiner, R.; Newman, M.; Widdowson, A.; Ivanova, D.; Likonen, J.; Petersson, P.; Pintsuk, G.; Rubel, M.; Meyer, E.; Contributors, JET.

In: Physica Scripta, Vol. 2016, No. T167, 2016.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

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, J.

AU - Petersson, P.

AU - Pintsuk, G.

AU - Rubel, M.

AU - Meyer, E.

AU - Contributors, JET

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

VL - 2016

JO - Physica Scripta

JF - Physica Scripta

SN - 0031-8949

IS - T167

ER -

Moser L, Marot L, Steiner R, Newman M, Widdowson A, Ivanova D et al. Plasma cleaning of beryllium coated mirrors. Physica Scripta. 2016;2016(T167). https://doi.org/10.1088/0031-8949/T167/1/014069