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2 2012

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Removal of hydrogenated carbon deposits formed in fusion reactors with carbon walls by reactive oxygen particles

Mozetič M.

Nukleonika

2012

Vol. 57, No. 2

269-275

A method for removal of hydrogenated carbon deposits from the walls of fusion reactors with carbon divertors is presented. The method is based on interaction of neutral oxygen atoms with deposits at elevated temperatures typically found in such fusion reactors. The source of neutral oxygen atoms is oxygen plasma created with electrodeless high frequency discharges. The density of oxygen atoms in such plasma may approach 1022 m-3 making such discharges suitable for removal of deposits in huge systems like tokamaks.

Methane cracking and secondary hydrocarbon generation in inductively coupled RF plasmas

Tabarés F. L., Alegre D., Mozetič M., Vesel A.

Nukleonika

2012

Vol. 57, No. 2

287-290

Pure methane plasmas have been produced in an inductively coupled radio frequency (ICRF) reactor with quartz walls in the absence of carbon film deposition. A differentially pumped mass spectrometer was used for the recording of the secondary hydrocarbon species produced in the reactor. The functional dependences of these species with plasma parameters has been analyzed and tentative mechanisms for their formation have been formulated. High power per molecule ratio promotes methane decomposition and acetylene formation.