Assessment of the spatial distribution of low-temperature plasma parameters on plasma-beam installation

At present continue, studies of the interaction of plasma with structural materials of the first wall and divertor of the ITER international experimental fusion reactor on operating tokamaks and simulated plasma facilities. In the research of the interaction of plasma with the surface of candidate materials TNR an important role plasma parameters play. For determination of local values of the main plasma parameters there is a separate field of research – plasma diagnostics. Plasma diagnostics is the determination of local and instantaneous values of main its parameters: concentration and temperature of charged plasma particles, as well as the distribution functions of various plasma components by energies.

This works presents the results of a research to the spatial distribution of local parameters (temperature electrons (Te) and plasma concentration (ne)) of a low-temperature plasma on a plasma-beam installation (PBI) with the help a movable Langmuir probe with the following geometrical parameters of the electrode: length – 4 mm; diameter 0.5 mm. The probe sweep was with the help a Keithley 6487 picoammeter. The processing of volt-ampere characteristics (VAC) was carried out by standard methods.

To assess the spatial distribution of the above-mentioned parameters of low-temperature plasma, experiments were carried out with the location of the probe at a distance of 5 mm, 9 mm and 11 mm from the center of the plasma beam at different energies of the primary electron beam in the range from 0.5 keV to 5 keV.

The experiments results showed a smooth decrease in plasma concentration in the radial direction.

1. Smirnov B.M. Processes involving small particles // Moscow: Logos, 2012. (In Russian).

2. Rusanov V.D., Fridman A.A. Physics of chemically active plasma // Nauka. – 1984. – 416 p. (In Russian).

3. Fortov V.E., Khrapak A.G., Yakubov I.T. Physics of non-ideal plasma // FIZMATLIT. – 2010, 528 p. (In Russian).

4. Ivanovsky G.F., Petrov V.I. Ion-plasma processing of materials. – M.: Radio and communication. – 1986. (In Russian).

5. Tolliver, R. Nowitzki, D. Hess, N. Ainspruck, D. Brown. Plasma technology in the production of VLSI. – M.: Mir, 1987. – 469 p. (In Russian).

6. Danilin B.S., Kireev V.Yu. Application of low-temperature plasma for etching and cleaning of materials. – M.: Energoatomizdat, 1987. – 263 p. (In Russian).

7. Aleksandrov A.F., Vavilin K.V., Kralkina E.A., Neklyudova P.A., Pavlov V.B. – Investigation of the plasma parameters of an inductive RF plasma source with a diameter of 46 cm. Part I. Plasma parameters in the skin layer region // Applied Physics. – 2013. – Issue 5. (In Russian).

8. Berezkin A.V., Bragin E.Yu., Zhiltsov V.A., Kulgin V.M., Yanchenkov S.V. – Experimental studies plasma of flows in an open trap with a toroidal divertor at ezr discharge // SIC "Kurchatov Institute". – 2014. – Issue 1. (In Russian).

9. Tich M., Hubicka Z. et al. Langmuir probe diagnostics of a plasma jet system // Plasma Sources Sci. Technol. – 2009. – Vol.18. – 11p. (In Russian).

10. Meshcheryakova E., Zibrov M., Kaziev A., Khodachenko G., Pisarev A. Langmuir probe diagnostics of low-pressure inductively coupled argon plasmas in a magnetic field // Physics Procedia. –2015. –Vol.71. – 121–126 p. (In Russian).

11. Kozlov O.V. Electric probe in plasma. – M.: Atomizdat, 1969. (In Russian).

12. Chan P., Talbot L., Turyan K. Electric probes in stationary and moving plasma. – M.: Mir. – 1978. (In Russian).

13. Chen F.F. Langmuir Probe Diagnostics // IEEE-ICOPS Electrical Engineering Department University of California, Los Angeles, Jeju, Korea. – June 5, 2003. – 42 р. (In Russian).

14. Patent of the Republic of Kazakhstan No. 2080. Simulation stand with plasma beam installation / Kolodeshnikov A.A., Zuev V.A., Ganovichev D.A., Tulenbergenov T.R. [et al.]; applicant and patent holder of the RSE NNC RK. – No. 2016/0108.2; application 29.02.2016; publ. 15.03.2017, Bul. No. 5-3 p. (In Russian).

15. Sokolov I.A., Skakov M.K., Miniyazov A.Zh., Tulenbergenov T.R. Study of the processes of formation of carbides on the surface of the divertor of a thermonuclear reactor // Bulletin of KazNAEN. – 2019. – Issue. 1.– 44-49 р. (In Russian).

16. Zhanbolatova G.K., Baklanov V.V., Tulenbergenov T.R., Miniyazov A.Zh., Sokolov I.A. Carbidization of the tungsten surface in a beam-plasma discharge // Vestnik NNC RK. – 2020. – Issue. 4.– P. 77-81. (In Russian).

17. Kurnaev V., Vizgalov I., Gutorov K., Tulenbergenov T., Sokolov I., Kolodeshnikov A., Ignashev V., Zuev V., Bogomolova I., Klimov N. Investigation of plasma-surface interaction at plasma beam facilities // Journal of Nuclear Materials. – 2015. – Vol.463. – 228-232 р. (In Russian).