Institute of Physics

DEPARTMENT OF GAS ELECTRONICS

Head: Prof.Dr. Igor O. Soloshenko

Main areas of research: physics and technology of intense ion beam and ion sources.

Main recent results:

Mechanisms of H- ions formation in a source of reflective type in stationary and pulsed-periodical regimes are investigated theoretically and experimentally. The technique of calculating all discharge parameters is developed, including calculations of negative ions current, which can be extracted from the source. The technique can be used for calculations of ion sources of gas discharge type. It is demonstrated, that cesium adding to discharge of the source results in essential increase of H- ions current and gas economy of the source. For the first time the mechanism of this phenomenon is definitely established, consisting in recharging of hydrogen atoms at the anode surface.

New type of sterilizer for processing medical instruments and materials at a temperature less than 60°C based on usage of low-temperature gas discharge plasma is developed. It is determined, that principal sterilizing agents of gas discharge plasma are ultraviolet radiation and active electrically neutral particles. The device is protected by patent of Ukraine and is ready for implementation in manufacturing.

For the first time the high-current plasma lenses (PL) are studied, in which the value of non-compensated potential of passing ion beam exceeds essentially the potential of external electric field. Physicals mechanisms, determining static and dynamic characteristics of these PL, are defined. Role of spherical and moment aberrations in formation of radial profile of focused ion beam is shown. High efficiency of such PL use for focusing of high-current heavy-ion beams is demonstrated. It enables implementation of these unique devices in technological setups for high-dose ion implantation and in high-current accelerators of heavy ions.

It is shown that the electric field of Langmuir oscillations in a cold plasma contains a time-independent component setting ions in motion. As a consequence of this interaction, the crossing of electron trajectories occurs even at small amplitudes at time tc, i.e. one-dimensional turbulence appears in the system. The expression for tc is derived.

Theory of microdroplet generation in liquid metal ion sources is constructed. It is shown, that low-frequency oscillations of ion current are due to periodical destruction of liquid metal jet, occurring at a top of Tailor cone. High-frequency and low-frequency Faraday effects determine generation of droplets with wide range of sizes (microdroplet chaos).

Possibility of near space debris removal (small particles dangerous for space vehicles) by electron beam. In this case the beam melts debris particle and charges it to overcome Raleigh threshold. Appearance of multimode instability at a melt surface results in sputtering the droplet into microdroplets.

The most important recent papers:

1. P.Golovinsky, V.Goretsky, A.Ryabtsev et al. 6th Intern. Symposium on Production and Neutralization of Negative Ions and Beams. Upton; New York, 1992, p.430.

2. V.Goretskii, A.Ryabtsev, I.Soloshenko, O.Tarasenko, A.Schedrin. Zhurn.Tech.Fiz., vol. 63, N9, 46-52 (1993).

3. V.Goretskii, A.Ryabtsev, I.Soloshenko, O.Tarasenko, A.Schedrin. Zhurn.Tech.Fiz., vol.64.N7. 152-157 (1994).

4. V.Goretskii, A.Ryabtsev, I.Soloshenko, O.Tarasenko, A.Schedrin. Fizika Plazmy, vol.20, N9, 836-848 (1994).

5. V.Goretskii, A.Ryabtsev, I.Soloshenko, O.Tarasenko, A.Schedrin. Zhurn.Tech.Fiz., vol.66, N2, 88-97 (1993).

6. V.Khomich, I.Soloshenko, V.TsioIko et al. Proceedings of the 12th International Conference on Gas Discharges and their Applications. Greifswald, 1997, pp. 740-743.

7. V.Khomich, I.Soloshenko, V.TsioIko et al. Proceedings of the International Congress on Plasma Physics, Prague, 1998, pp. 2745-2748.

8. V.Khomich, I.Soloshenko, V.TsioIko et al. Proceedings of the 14th International Symposium on Plasma Chemistry, Prague, 1999, pp.2551-2556.

9. A.Goncharov, A.Dobrovolsky, A.Zatuagan, I.Protsenko. IEEE Trans.on Pl.Sci., vol.21, 573-578 (1993).

10. A.Goncharov, A.Dobrovolsky, I.Litovko, I.Protsenko, V.Zadorodzny. Rev.Sci.Instr., v.67,N3,1155-1157(1996)

11. A.Kovalenko, V.Kovalenko. Phys.Plasmas, v.4, N9, (1997).

12. V.Gorshkov, V.Vladimirov. Appl.Surf.Science, v.65/66, Nl, 1-12 (1993).

13. V.Gorshkov, D.Mozyrsky, V.Vladimirov. Appl. Surf. Science, v.94/95, 171-176 (1996).

14. V.Gorshkov, D.Mozyrsky. Zhurn.Tech.Fiz., vol.66, №0, 15-25 (1996).