Plasma cleaning of ITER First Mirrors in magnetic field

Moser, Lucas and Steiner, Roland and Leipold, Frank and Reichle, Roger and Marot, Laurent and Meyer, Ernst. (2015) Plasma cleaning of ITER First Mirrors in magnetic field. Journal of Nuclear Materials, 463. pp. 940-943.

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Official URL: http://edoc.unibas.ch/40347/

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To avoid reflectivity losses in ITER`s optical diagnostic systems, plasma sputtering of metallic First Mirrors is foreseen in order to remove deposits coming from the main wall (mainly beryllium and tungsten). Therefore plasma cleaning has to work on large mirrors (up to a size of 200 x 300 mm) and under the influence of strong magnetic fields (several Tesla). This work presents the results of plasma cleaning of aluminium and aluminium oxide (used as beryllium proxy) deposited on molybdenum mirrors. Using radio frequency (13.56 MHz) argon plasma, the removal of a 260 nm mixed aluminium/aluminium oxide film deposited by magnetron sputtering on a mirror (98 mm diameter) was demonstrated. 50 nm of pure aluminium oxide were removed from test mirrors (25 mm diameter) in a magnetic field of 0.35 T for various angles between the field lines and the mirrors surfaces. The cleaning efficiency was evaluated by performing reflectivity measurements, Scanning Electron Microscopy and X-ray Photoelectron Spectroscopy.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Nanomechanik (Meyer)
UniBasel Contributors:Meyer, Ernst and Moser, Lucas and Marot, Laurent
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Elsevier B.V.
Note:Publication type according to Uni Basel Research Database: Journal article
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edoc DOI:
Last Modified:26 May 2023 13:48
Deposited On:02 May 2016 14:06

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