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Description
The 30 MeV Karaj-C30 cyclotron, developed for medical and industrial radioisotope production, accelerates H⁻ ions to 15–30 MeV and D⁻ ions below 15 MeV using a carbon stripper foil for extraction. The system features a filament-based negative hydrogen multicusp ion source providing 1–2 mA, an injection line with optical elements, a two-sector electromagnet, and an RF resonator. Beam profiles measured 30 cm upstream of the stripper magnet using a Mylar foil revealed a significant horizontal shift and beam loss on the injection-line optics. IBSimu simulations of the extraction system reproduced this deflection and indicated that erosion of the ground electrode created a radial electric field responsible for the observed misalignment. Replacing the damaged electrode restored the beam trajectory and recovered the extracted current to 80 μA, in agreement with simulation predictions. Despite the improved alignment, the measured profiles still show signs of non-optimal extraction optics and a perveance mismatch. Future work will focus on redesigning the extraction system to achieve higher transported currents for isotope production.
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