Authors & Affiliations
Engelko V.I., Pavlov E.P., Tkachenko K.I., Shchegolikhin N.P.
D.V. Efremov Institute of Electrophysical Apparatus, St.Petersburg, Russia
Engelko V.I. – Chief Researcher, Dr. Sci. (Tech.), D.V. Efremov Institute of Electrophysical Apparatus.
Pavlov E.P. – Senior Researcher, Cand. Sci. (Tech.), D.V. Efremov Institute of Electrophysical Apparatus.
Shchegolikhin N.P. – Lead Engineer, D.V. Efremov Institute of Electrophysical Apparatus.
Large number researches with constructional steels used in nuclear reactjrs with heavy liquid-metal heat-transfer agents, have shown, that using of pulse intense electron beams (PIEB) including precoated with Al layer may be the most perspective meanse to improve operational characteristics of these steels.
In report it ispresented description of experimental facility for practical realization of modification process of fuel element cladding surface, having radially converging PIEB with the electron source 100 cm long. The source consists of a cathode, a control grid and an anode, which is a treated target. Here they are presented the results of the first stage of experimental researches of the operation of this source. Design of the cathode of described electron source differs essentially from cjn-struction of previously used uncontrollable multipoint cathode. In new version of the cathode as an emitter of electrons it is used plasma indused by large quantities (2400 pieces) of the vacuum-arc discharge gaps arranged uniformly on surface of the cilindrical base plate. Whole assemblage of the discharge gaps consists of the cells each including four point electrodes and one cruciform discharge electrode in common. On surface of the cilindical target having diameter of 10 mm it was achieved density of electron beam energy of 30 J/cm2 on length not less 50 cm. They are shown the ways to increase the parameters of electron beam facility.
facility, electron source, fuel cladding, HLMC, electron beam modification, improvement of operational properties
1. Engelko V.I. Razrabotka metodov formirovaniya intensivnykh elektronnykh i ionnykh puchkov mikrosekundnoy dlitel'nosti, sozdanie na ikh osnove uskoriteley i ikh primenenie. Diss. dok. tekh. nauk [Development of methods for the formation of intense electron and ion beams of microsecond duration, the creation on their basis of accelerators and their application. Dr. techn. sci. diss.]. St. Petersburg, 2002.
2. Engelko V., Mueller G., Rusanov A. et al. Surface modification/alloying using intense pulsed electron beam as a tool for improving the corrosion resistance of steels exposed to heavy liquid metals. Journal of Nuclear Materials, 2011, vol. 415, no. 3, pp. 270–275.
3. Engelko V.I., Tkachenko K.I., Rusanov A.E., Birzhevoy G.A. Opytnaya ustanovka dlya elektronno-luchevoy modifikatsii poverkhnosti obolochek TVELov i PELov RU s teplonositelyami Pb i Pb-Bi [Experimental facility for electron beam modification of fuel and absorber element claddings of reactors with Pb and Pb-Bi coolants]. Voprosy Atomnoy Nauki i Tekhniki. Seriya: Yaderno-reaktornye konstanty – Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constans, 2015, vol. 4, pp. 93—99.
4. Engelko V.I., Kuznetsov V.S., Mueller G. Electron source of triode type with radial converging electron flow for irradiation of cylindrical target. Journal of Applied Physics, 2009, vol. 105, no. 2, pp. 023305.
5. Engelko V.I., Mueller G. Microsecond intense electron beams for industrial applications. IEEE Transactions on Plasma Science, 2013, vol. 41, no. 10, pp. 2769–2773.
6. Engelko V.I. Formation of stable long-pulse electron beams with the help of explosive emission cathodes. Plasma Devices and Operations, 2005, vol. 13, no. 2, pp. 135–142.
7. Altsybeyev V., Engelko V., Ovsyannikov A., Ovsyannikov D., Ponomarev V., Fetzer R., Mueller G. Numerical simulation of a triode source of radial converging electron beam. Journal of Applied Physics, 2016, vol. 120, no. 14, pp. 143301.
8. Fetzer R., An W., Weisenburger A., Mueller G. Different operation regimes of cylindrical triode-type electron accelerator studied by PIC code simulation. Laser and Particle beams, 2017, vol. 35, no. 1, pp. 33–41.
UDC 621.9.048.7, 621.039.54