Near surface modification of R-sapphire exposed to long term RF hydrogen-neon plasma
Gorodetsky А. Е. 1, Markin A. V.1, Bukhovets V. L.1, Rybkina Т. V. 1, Zalavutdinov R. Kh1, Zakharov A. P.1, Mukhin E. E.2, Razdobarin A. G.2
1Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, Russia
2Ioffe Institute, St. Petersburg, Russia
Email: avmarkin@mail.ru, utqexplorer@gmail.com, labrchs@hotmail.com, rinadz@mail.ru, azakharov@ipc.rssi.ru, e.mukhin@mail.ioffe.ru
Samples of R-sapphire were exposed to long term RF hydrogen-neon plasma. Modification of near-surface layers was studied by XRD and XPS, and optical changes were assessed by spectrophotometry. After removing 270 nm thick layer the internal stresses remained at an initial value, but in the layer that probing by XRD individual blocks turned around and shifted from the Bragg reflection. XPS shows that aluminum is still an Al2O3 compound. Light transmission in the wavelength range 400-1000 nm remained unchanged which makes it possible to use sapphire as a protection window for optical diagnostics in fusion facilities. Keywords: sapphire, RF discharge, hydrogen, neon, structure surface layer, light transmission, ITER.
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