Naslov
Research of amorphous hydrogenised carbon deposit removal by neutral oxygen radicals

Autori
Drenik, Aleksandar, Vesel, Alenka, Mozetič, Miran ; Panjan, P ; Čekada, M ; Krstulović, Nikša ; Milošević, Slobodan

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
16th International Scientific meeting on vacuum science and technique, Book of Abstracts / Kovač, Janez ; Mozetič, Miran - Ljubljana : Slovenian Society for Vacuum Technique (DVTS), 2009, 17-17

ISBN
978-961-90025-7-5

Skup
16th International Scientific meeting on vacuum science and technique

Mjesto i datum
Bohinj, Slovenija, 04.06.2009. - 05.06.2009

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
oxygen plasma; removal of carbon amorphous deposits; ITER

Sažetak
As carbon based materials are the prime candidate for first wall material in ITER, the formation of amorphous hydrogenised carbon co-deposits (a-C:H) is a present problem. The a-C:H are formed when hydrogen isotopes from the plasma cause chemical erosion of carbon atoms from the reactor walls. Eroded carbon atoms form various C:H molecules with the H isotopes and are subsequently re-deposited on reactor walls. As radioactive tritium is one of the entrapped hydrogen isotopes, the level of radioactivity inside the reactor rises. When the entrapped tritium inventory reaches 700 g, the level of radioactivity will exceed allowed walues. In order to prevent this, there is a need to develop a cleaning technology that will allow for efficient removal of a-C:H during ITER operation or between individual plasma shots. In our experiment we studied interaction of laboratory prepared a-C:H with neutral oxygen radicals at various sample surface temperatures. The source of oxygen radicals was a radiofrequency discharge created in 75 Py pure oxygen atmosphere. The discharge was characterised by means of optical emission spectroscopy and fiber optics catalitic probes. Erosion rates were found to be between 1 nm/s at 150 deg. Celsius and 10 nm/s at 350 deg. Celsius.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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