Investigation of plasma Sample Clauses

Investigation of plasma facing wall surfaces conditions after pumping and RF discharge cleaning procedures in the Uragan-2M torsatron. The thermal desorption method has been developed for operative diagnosing impurity level of Uragan-2M (U-2M) vacuum chamber surfaces in situ. To perform the experiments the device was designed, manufactured and installed in the U-2M vacuum chamber, which gives possibility to register low flows of gases desorbed from the 12KH18N10T stainless steel (SS) strip-like probe during its pulsed heating up to temperature 250-300ºC. The investigations were carried out of SS probe outgassing rate and estimation of the number of monolayers on its surface after preliminary pumping and RF discharge cleaning in one of conditioning regimes. The decrease of surface impurity by more than one order of magnitude was measured at the vacuum improvement from 1.6·10-6 Torr up to 6.5·10-7 Torr after pumping and RF discharge cleaning. Mass-spectrometric measurements has shown H2O(18 a.m.u.), CO2(44 a.m.u.) and 28 a.m.u., as the main gases desorbed from probe surface during its heating. Heavy hydrocarbon masses were also registered. Some practical conclusions were made for the U-2M wall conditioning procedure but to provide the estimation of efficiency of various scenarios of wall conditioning process in the U-2M torsatron the additional experiments will be provided. The results have been published in paper: Method for diagnostics of the Uragan-2M vacuum chamber surface conditions. Physical surface engineering. 2012. V.10, #2, p. 173-176, (G.P. Glazunov, V.K. Pashnev), and have been reported on the International Conference-school on plasma physics and controlled fusion. (G.P. Glazunov and others)
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