Assessment of cleaning methods for first mirrors tested in JET for ITER

JET-EFDA collaborators

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)

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)S1241-S1244
Number of pages4
JournalJournal of Nuclear Materials
Volume438
Issue numberSupplement
DOIs
Publication statusPublished - 2013
MoE publication typeA1 Journal article-refereed
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
polishing
mirrors
reflectance
Diamonds
Deposits
diamonds
deposits
Polishing
Buffing
Polishing machines
recovery
ultrasonic cleaning
Ultrasonic cleaning
Recovery
Ointments
detachment
Ion beams

Cite this

JET-EFDA collaborators. / Assessment of cleaning methods for first mirrors tested in JET for ITER. In: Journal of Nuclear Materials. 2013 ; Vol. 438, No. Supplement. pp. S1241-S1244.
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author = "D. Ivanova and A. Widdowson and Jari Likonen and L. Marot and Seppo Koivuranta and J.P. Coad and M. Rubel and P. Petersson and {De Temmerman}, G. and {JET-EFDA collaborators}",
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Assessment of cleaning methods for first mirrors tested in JET for ITER. / JET-EFDA collaborators.

In: Journal of Nuclear Materials, Vol. 438, No. Supplement, 2013, p. S1241-S1244.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Assessment of cleaning methods for first mirrors tested in JET for ITER

AU - Ivanova, D.

AU - Widdowson, A.

AU - Likonen, Jari

AU - Marot, L.

AU - Koivuranta, Seppo

AU - Coad, J.P.

AU - Rubel, M.

AU - Petersson, P.

AU - De Temmerman, G.

AU - JET-EFDA collaborators

PY - 2013

Y1 - 2013

N2 - 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.

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.

U2 - 10.1016/j.jnucmat.2013.01.275

DO - 10.1016/j.jnucmat.2013.01.275

M3 - Article

VL - 438

SP - S1241-S1244

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

SN - 0022-3115

IS - Supplement

ER -