Assessment of Cleaning Methods for First Mirrors Tested in JET for ITER

D. Ivanova, Jari Likonen, A. Widdowson, J.P. Coad, M. Rubel, G. De Temmerman, JET-EFDA Contributors

Research output: Contribution to journalArticle in a proceedings journalScientificpeer-review

Abstract

Two cleaning techniques were used for removal of co-deposits from the tested first mirrors exposed in JET: (a) ultrasonic bath; (b) a broad range of polishing conditions from manual buffing to machine polishing with the diamond grain size of up to 3 μm.
Reflectivity measurements were performed after each step in the cleaning procedure. Surfaces were also examined with electron microscopy and ion beam analysis methods. Ultrasonic cleaning leads to partial recovery of reflectivity due to enhanced detachment of deposits.
Typically 30–50% of the original reflectivity was recovered in the visible light and 50–90% in the infrared region. One mirror was cleaned completely.
Polishing with diamond paste may lead to successful removal of deposits but the damage to the surface in case of the large diamond grains was observed.
Recovery of up to 100% of the initial reflectivity was achieved for some mirrors.
Original languageEnglish
Pages (from-to)Paper P3-094
JournalJournal of Nuclear Materials
Volume438
Issue numberSupplement
DOIs
Publication statusPublished - 2012
MoE publication typeA4 Article in a conference publication
Event20th International Conference on Plasma-Surface Interactions in Controlled Fusion Devices - Aachen, Aachen, Germany
Duration: 21 May 201225 May 2012

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cleaning
Diamond
Cleaning
Mirrors
polishing
mirrors
reflectance
Diamonds
Deposits
diamonds
deposits
Polishing
Buffing
Polishing machines
recovery
ultrasonic cleaning
Ultrasonic cleaning
Recovery
Ointments
detachment

Cite this

Ivanova, D., Likonen, J., Widdowson, A., Coad, J. P., Rubel, M., De Temmerman, G., & Contributors, JET-EFDA. (2012). Assessment of Cleaning Methods for First Mirrors Tested in JET for ITER. Journal of Nuclear Materials, 438(Supplement), Paper P3-094. https://doi.org/10.1016/j.jnucmat.2013.01.275
Ivanova, D. ; Likonen, Jari ; Widdowson, A. ; Coad, J.P. ; Rubel, M. ; De Temmerman, G. ; Contributors, JET-EFDA. / Assessment of Cleaning Methods for First Mirrors Tested in JET for ITER. In: Journal of Nuclear Materials. 2012 ; Vol. 438, No. Supplement. pp. Paper P3-094.
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abstract = "Two cleaning techniques were used for removal of co-deposits from the tested first mirrors exposed in JET: (a) ultrasonic bath; (b) a broad range of polishing conditions from manual buffing to machine polishing with the diamond grain size of up to 3 μm. Reflectivity measurements were performed after each step in the cleaning procedure. Surfaces were also examined with electron microscopy and ion beam analysis methods. Ultrasonic cleaning leads to partial recovery of reflectivity due to enhanced detachment of deposits. Typically 30–50{\%} of the original reflectivity was recovered in the visible light and 50–90{\%} in the infrared region. One mirror was cleaned completely. Polishing with diamond paste may lead to successful removal of deposits but the damage to the surface in case of the large diamond grains was observed. Recovery of up to 100{\%} of the initial reflectivity was achieved for some mirrors.",
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Ivanova, D, Likonen, J, Widdowson, A, Coad, JP, Rubel, M, De Temmerman, G & Contributors, JET-EFDA 2012, 'Assessment of Cleaning Methods for First Mirrors Tested in JET for ITER', Journal of Nuclear Materials, vol. 438, no. Supplement, pp. Paper P3-094. https://doi.org/10.1016/j.jnucmat.2013.01.275

Assessment of Cleaning Methods for First Mirrors Tested in JET for ITER. / Ivanova, D.; Likonen, Jari; Widdowson, A.; Coad, J.P.; Rubel, M.; De Temmerman, G.; Contributors, JET-EFDA.

In: Journal of Nuclear Materials, Vol. 438, No. Supplement, 2012, p. Paper P3-094.

Research output: Contribution to journalArticle in a proceedings journalScientificpeer-review

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AU - Ivanova, D.

AU - Likonen, Jari

AU - Widdowson, A.

AU - Coad, J.P.

AU - Rubel, M.

AU - De Temmerman, G.

AU - Contributors, JET-EFDA

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AB - Two cleaning techniques were used for removal of co-deposits from the tested first mirrors exposed in JET: (a) ultrasonic bath; (b) a broad range of polishing conditions from manual buffing to machine polishing with the diamond grain size of up to 3 μm. Reflectivity measurements were performed after each step in the cleaning procedure. Surfaces were also examined with electron microscopy and ion beam analysis methods. Ultrasonic cleaning leads to partial recovery of reflectivity due to enhanced detachment of deposits. Typically 30–50% of the original reflectivity was recovered in the visible light and 50–90% in the infrared region. One mirror was cleaned completely. Polishing with diamond paste may lead to successful removal of deposits but the damage to the surface in case of the large diamond grains was observed. Recovery of up to 100% of the initial reflectivity was achieved for some mirrors.

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DO - 10.1016/j.jnucmat.2013.01.275

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SP - Paper P3-094

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