Speaker
Description
A short-pulse electron accelerator system for pulse radiolysis is being developed at the Advanced Radiation Technology Institute of KAERI (Korea Atomic Energy Research Institute) by upgrading an existing irradiation accelerator. The objective is to reduce the electron-beam pulse width from approximately 20 μs to below 1 μs and ultimately achieve nanosecond-scale operation at approximately 10 MeV. A thermionic electron gun employing an EIMAC Y-845 cathode (CPI Inc.) was designed and analyzed using 3D electromagnetic simulation code. The effects of grid and Wehnelt electrode voltages on electron emission and beam quality were investigated. The electron gun was optimized for efficient beam extraction, and solenoid focusing was evaluated for downstream beam transport. A beam current of 1.46 A and a beam size of approximately 6 mm were obtained under the optimized conditions at target position. These results demonstrate the feasibility of the proposed electron gun for short-pulse electron-beam generation and provide a basis for further development toward nanosecond pulse radiolysis.
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