EUROPEAN COOPERATION IN SCIENCE AND TECHNOLOGY COST is supported by the EU RTD Framework Programme ESF provides the COST Office through an EC contract COST Action TD1208 Electrical discharges with liquids for future applications Prof. I.A.Kossyi , Vavilov Str. 38, Moscow, Russia Prokhorov General Physics Institute of Russian Academy of Sciences Studied topics During the past years secondary electron emission microwave discharge (“multipactor”) has mainly been studied due to the adverse effect it can have on microwave systems operating in a vacuum environment. In this report results of developed in the GPI techniques meant for preventing such a phenomena like “multipactor” on the elements of a satellite-borne microwave facility are presented. Method is based on the coating of metal by thin films composed on nano-dimensional carbon. Original principles of nano-structural carbon production have been elaborated. Setup in which nano-dimensional carbon has been produced is presented on the Fig. 1. The basis of original technology is excitation of multispark discharge in a ethanol volume. As a working gas coming through the inter-electrode space Ar has been applied. As a result of this discharge ethanol suspension containing nano-size carbon (20-30 nm) has been produced. With the application of this jell thin nano- carbon films on the surface of metallic samples have been precipitated. These films lead to the essential increasing of “multipactor” threshold and consequently to the increasing of the microwave power at which these samples can operate. Fig. 1. Scheme of setup. 1-cuvette ; 2-ethanol; 3-multispark discharger; Fig. 2. Scheme of carbon thin film 4- gas (Ar); 5-power supply; 6- deposition through the evaporation Rogovskii coil; 7-voltage divider; 8- of ethanol suspension. 1-substrate; spectrograph; 9-optical waveguide; 2-nano-size carbon; 3-ethanol. 10-insulator; 11-electrodes; 12- bubbles; 13-discharge plasma. photo of group leader

EUROPEAN COOPERATION IN SCIENCE AND TECHNOLOGY COST is supported by the EU RTD Framework Programme ESF provides the COST Office through an EC contract COST Action TD1208 Electrical discharges with liquids for future applications Main experimental/computational facilities For this work execution GPI has put into operation experimental setup based on the multispark discharge in the liquid medium; Diagnostic system for electro-physical and optical properties of sample coated by nano- size carbon film has been assembled and adjusted. Main research collaborations and industrial partners GPI in the framework of this program cooperated with; Ltd „PLASMA-PRO“ (Saratov); ;Skolkovo Foundation for development of the New Technologies Development and Commercialization. Main publications E.M.Barkhudarov, I.A.Kossyi, Yu.N.Kozlov et al. Multispark Discharge in Water as a Method of EnvironmentalSustainability Problems Solution// Journal of Atomic and Molecular Physics, v (2013), Article ID , 12 pages. I.A.Kossyi, A.M.Anpilov, E.M.Barkhudarov, G.S.Luk‘yanchikov, A.S.Tsibul‘skii. Cladding Metallic Surface with Thin-Film Nano-dimensional Carbon for Diminishing of Secondary Electron Emission Yield // 7th International Workshop on Multipactor, Corona and Passive Intermodulation in Space RF Hardware. 2011, Valencia, Spain, El. Proceedings, Report S101. S.I.Gritsinin, A.M.Davydov, I.A.Kossyi, M.R.Shakarov, K.A.Arapov. Microwave gliding discharge on a metal-dielectric structure as a method of nano-size carbon production // IEP-2011, Intern. Conf. of young scientists and post-graduates, Uzhhorod, 2011, Abstracts, pp A.M.Anpilov, E.M.Barkhudarov, I.A.Kossyi, M.A.Misakyan. Colloidal solution of nano- particles production by means of high-voltage pulse discharge // XL Intern. Zvenigorod Conf. On plasma physics and controlled fusion, 2013, Zvenigorod, Moscow, Abstracts, p Fig. 3. Nano-structural carbon suspension Fig. 4. Photograph of thin nano-carbon in the ethanol obtained at different film deposited by evaporation method. exposition time.