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    125. N.G.Reshetnyak, A.N.Dovbnya, M.I.Ayzatskiy, V.N.Boriskin, V.V.Zakutin,

    • V.

      P.Romasko, I.A.Chertishchev, N.A.Dovbnya (Kharkov Institute of Physics and Tech- nology, Kharkov, Ukraine)

THE ELECTRON ACCELERATOR BASED ON THE SECONDARY- EMISSION SOURCE FOR MATERIAL-SURFACE TREATMENT

The electron accelerator for radiation technology purposes is being created at the NSC KIPT. The accelerator is designed to have a particle energy up to 200 keV and a beam power up to 5 MWt/cm2 at a voltage pulse duration between 8 and 40 mks and a pulse repetition rate up to 10 Hz. A magnetron gun with a cold secondary-emission cathode in cross fields is used as an electron source. Results are reported from the experiments on electron beam production in the magnetron gun (the diameters of the cathode and anode being 40 mm and 78 mm, respectively). The longitudinal magnetic field was measured to range from 1500 to 2300 Oe. In one of the modes of operation, an accelerated electron energy of ~ 100 keV was obtained (beam current 110 A, duration ~ 16 mks), the power density on the target was ~ 4 MW/cm2. Targets made from different materials (stainless steel, aluminum, etc.) were exposed to radiation.

Dr. Mykola Reshetnyak: zakutin@kipt.kharkov.ua

P.126. Zbigniew ZIMEK, Zygmunt DZWIGALSKI, Stanislaw WARCHOL; Sylwester BULKA, Karol ROMAN (Institute of Nuclear Chemistry and Technology, Poland)

UPGRADING OF ACCELERATOR FACILITY FOR RADIATION STERILIZATION

Upgrading of radiation facility located at Institute of Nuclear Chemistry and Technology in Warsaw equipped with linear electron accelerator towards higher technical and eco- nomical effectiveness is being performed to obtain better operational characteristics suit- able for radiation processing and research programs in the field of radiation technology development. The objective of the project initiated in 2004 is related to construction of 10 MeV, 15 kW linear electron accelerator equipped with microwave source based on mod- ern klystron device operated at frequency according to European standards and standing wave accelerating section. The project is indispensable in order to promote effectively in Poland the radiation technologies for sterilzation medical devices and tissue grafts as well as food product hygenization and other radiation processes where high energy electrons are required. The following stages of the project have been described: design of micro- wave system of accelerator including pulse power supply, completion and installation of necessary systems including klystron stand, pulse power supply stand, driving generator stand and waveguide system. The semiconductor HV transistor switch was applied in kly- stron modulator. The standing wave accelerating section has been implemented. Electron beam alignment, beam parameters evaluation and accelerator commissioning will be the final stage of the project. The better accelerator availability, more stable beam parameters, better spare parts availability, reduced exploitation costs and higher beam power are ex- pected after successful project implementation foreseen in 2007.

Zbigniew ZIMEK: zimek@orange.ichtj.waw.pl

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